The following Python code enables you to convert distances, such as Light Years to Miles, Meters to Parsecs, Nanometers to Miles, and much more.

The following units are currently calculated in the conversion program: Miles, Meters, Kilometers, Centimeters, Millimeters, Micrometers, Nanometers, Yards, Feet, Inches, Nautical Miles, Light Years, Parsecs, Kiloparsecs, Megaparsecs, and Astronomical Units. If you would like any additional calculations or functionality to be added, please either add an issue on GitHub or contribute to the project by following these guidelines.

As with the previous temperature converter program, this program also imports the os and time modules so that we can do some tasks such as clearing the screen and using the sleep method. The code can be copied below, or it can be downloaded at the CosmicMatter GitHub repo, by clicking here.

(Note: The most up to date version of the source code will be located on GitHub in the link above. The code below is posted on the day of the posting of this article and not updated frequently).

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# Cosmic Matter - Unit Converter
# by: Ira Bell       Version 0.1
# Copyright (c) 2022 Space Elements

import os
import time

# The following program converts:
# (mi) -> km, m, cm, mm, µm, nm, yd, ft, in, NM, ly, pc, kjpc, Mpc, AU
# (m) -> km, m, cm, mm, µm, nm, yd, ft, in, NM, ly, pc, kjpc, Mpc, AU
# (km) -> km, m, cm, mm, µm, nm, yd, ft, in, NM, ly, pc, kjpc, Mpc, AU
# (cm) -> km, m, cm, mm, µm, nm, yd, ft, in, NM, ly, pc, kjpc, Mpc, AU
# (mm) -> km, m, cm, mm, µm, nm, yd, ft, in, NM, ly, pc, kjpc, Mpc, AU
# (µm) -> km, m, cm, mm, µm, nm, yd, ft, in, NM, ly, pc, kjpc, Mpc, AU
# (nm) -> km, m, cm, mm, µm, nm, yd, ft, in, NM, ly, pc, kjpc, Mpc, AU
# (yd) -> km, m, cm, mm, µm, nm, yd, ft, in, NM, ly, pc, kjpc, Mpc, AU
# (ft) -> km, m, cm, mm, µm, nm, yd, ft, in, NM, ly, pc, kjpc, Mpc, AU
# (in) -> km, m, cm, mm, µm, nm, yd, ft, in, NM, ly, pc, kjpc, Mpc, AU
# (NM) -> km, m, cm, mm, µm, nm, yd, ft, in, NM, ly, pc, kjpc, Mpc, AU
# (ly) -> km, m, cm, mm, µm, nm, yd, ft, in, NM, ly, pc, kjpc, Mpc, AU
# (pc) -> km, m, cm, mm, µm, nm, yd, ft, in, NM, ly, pc, kjpc, Mpc, AU
# (kpc) -> km, m, cm, mm, µm, nm, yd, ft, in, NM, ly, pc, kjpc, Mpc, AU
# (Mpc) -> km, m, cm, mm, µm, nm, yd, ft, in, NM, ly, pc, kjpc, Mpc, AU
# (AU) -> km, m, cm, mm, µm, nm, yd, ft, in, NM, ly, pc, kjpc, Mpc, AU
#
# Whereby:
# mi = Miles
#  m = Meters
# km = Kilometers
# cm = Centimeters
# mm = Millimeters
# µm = Micrometers
# nm = Nanometers
# yd = Yards
# ft = Feet
# in = Inches
# NM = Nautical Miles
# ly = Light Years
# pc = parsec
# kpc = Kiloparsec
# Mpc = megaparsec
# AU = Astronomical Unit
# Written by Ira Bell
# Copyright (c) 2022 Space Elements

def miles_input(miles):
    meters = (miles * 1609.344)
    meters_str = print(f"\t{meters} Meters (m)")
    kilometers = (miles * 1.609344)
    kilometers_str = print(f"\t{kilometers} Kilometers (km)")
    centimeters = (miles * 160934.4)
    centimeters_str = print(f"\t{centimeters} Centimeters (cm)")
    millimeters = (miles * 16099344)
    millimeters_str = print(f"\t{millimeters} Millimeters (mm)")
    micrometers = (miles * 1609344000)
    micrometers_str = print(f"\t{micrometers} Micrometers (µm)")
    nanometers = (miles * 1609344000000)
    nanometers_str = print(f"\t{nanometers} Nanometers (nm)")
    yards = (miles * 1760)
    yards_str = print(f"\t{yards} Yards (yd)")
    feet = (miles * 5280)
    feet_str = print(f"\t{feet} Feet (ft)")
    inches = (miles * 63360)
    inches_str = print(f"\t{inches} Inches (in)")
    nautical_miles = (miles * 0.8684210526)
    nautical_miles_str = print(f"\t{nautical_miles} Nautical Miles (NM)")
    light_years = (miles * 1.7010779502326E-13)
    light_years_str = print(f"\t{light_years} Light Years (ly)")
    parsecs = (miles * 5.2155287051488E-14)
    parsecs_str = print(f"\t{parsecs} Parsecs (pc)")
    kiloparsecs = (miles * 5.2155287051488E-17)
    kiloparsecs_str = print(f"\t{kiloparsecs} Kiloparsecs (kpc)")
    megaparsecs = (miles * 5.2155287051488E-20)
    megaparsecs_str = print(f"\t{megaparsecs} Megaparsecs (Mpc)")
    astronomical_units = (miles * 1.0757800178347E-8)
    astronomical_units_str = print(f"\t{astronomical_units} Astronomical Units (AU)")
    return meters_str, kilometers_str, centimeters_str, millimeters_str, micrometers_str, nanometers_str, yards_str, feet_str, inches_str, nautical_miles_str, light_years_str, parsecs_str, kiloparsecs_str, megaparsecs_str, astronomical_units_str

def meters_input(meters):
    miles = (meters * 0.0006213712)
    miles_str = print(f"\t{miles} Miles (mi)")
    kilometers = (meters * 0.001)
    kilometers_str = print(f"\t{kilometers} Kilometers (km)")
    centimeters = (meters * 100)
    centimeters_str = print(f"\t{centimeters} Centimeters (cm)")
    millimeters = (meters * 1000)
    millimeters_str = print(f"\t{millimeters} Millimeters (mm)")
    micrometers = (meters * 1000000)
    micrometers_str = print(f"\t{micrometers} Micrometers (µm)")
    nanometers = (meters * 1000000000)
    nanometers_str = print(f"\t{nanometers} Nanometers (nm)")
    yards = (meters * 1.0936132983)
    yards_str = print(f"\t{yards} Yards (yd)")
    feet = (meters * 3.280839895)
    feet_str = print(f"\t{feet} Feet (ft)")
    inches = (meters * 39.3700787402)
    inches_str = print(f"\t{inches} Inches (in)")
    nautical_miles = (meters * 0.0005396118)
    nautical_miles_str = print(f"\t{nautical_miles} Nautical Miles (NM)")
    light_years = (meters * 1.0570008340247E-16)
    light_years_str = print(f"\t{light_years} Light Years (ly)")
    parsecs = (meters * 3.2407792896664E-17)
    parsecs_str = print(f"\t{parsecs} Parsecs (pc)")
    kiloparsecs = (meters * 3.2407792896664E-20)
    kiloparsecs_str = print(f"\t{kiloparsecs} Kiloparsecs (kpc)")
    megaparsecs = (meters * 3.2407792896664E-23)
    megaparsecs_str = print(f"\t{megaparsecs} Megaparsecs (Mpc)")
    astronomical_units = (meters * 6.6845871226706E-12)
    astronomical_units_str = print(f"\t{astronomical_units} Astronomical Units (AU)")
    return miles_str, kilometers_str, centimeters_str, millimeters_str, micrometers_str, nanometers_str, yards_str, feet_str, inches_str, nautical_miles_str, light_years_str, parsecs_str, kiloparsecs_str, megaparsecs_str, astronomical_units_str

def kilometers_input(kilometers):
    miles = (kilometers * 0.6213711922)
    miles_str = print(f"\t{miles} Miles (mi)")
    meters = (kilometers * 1000)
    meters_str = print(f"\t{meters} Meters (m)")
    centimeters = (kilometers * 100000)
    centimeters_str = print(f"\t{centimeters} Centimeters (cm)")
    millimeters = (kilometers * 1000000)
    millimeters_str = print(f"\t{millimeters} Millimeters (mm)")
    micrometers = (kilometers * 1000000000)
    micrometers_str = print(f"\t{micrometers} Micrometers (µm)")
    nanometers = (kilometers * 1000000000000)
    nanometers_str = print(f"\t{nanometers} Nanometers (nm)")
    yards = (kilometers * 1093.6132983377)
    yards_str = print(f"\t{yards} Yards (yd)")
    feet = (kilometers * 3280.8398950131)
    feet_str = print(f"\t{feet} Feet (ft)")
    inches = (kilometers * 39370.078740157)
    inches_str = print(f"\t{inches} Inches (in)")
    nautical_miles = (kilometers * 0.5396118248)
    nautical_miles_str = print(f"\t{nautical_miles} Nautical Miles (NM)")
    light_years = (kilometers * 1.0570008340247E-13)
    light_years_str = print(f"\t{light_years} Light Years (ly)")
    parsecs = (kilometers * 3.2407792896664E-14)
    parsecs_str = print(f"\t{parsecs} Parsecs (pc)")
    kiloparsecs = (kilometers * 3.2407792896664E-17)
    kiloparsecs_str = print(f"\t{kiloparsecs} Kiloparsecs (kpc)")
    megaparsecs = (kilometers * 3.2407792896664E-20)
    megaparsecs_str = print(f"\t{megaparsecs} Megaparsecs (Mpc)")
    astronomical_units = (kilometers * 6.6845871226706E-9)
    astronomical_units_str = print(f"\t{astronomical_units} Astronomical Units (AU)")
    return miles_str, meters_str, centimeters_str, millimeters_str, micrometers_str, nanometers_str, yards_str, feet_str, inches_str, nautical_miles_str, light_years_str, parsecs_str, kiloparsecs_str, megaparsecs_str, astronomical_units_str

def centimeters_input(centimeters):
    miles = (centimeters * 6.2137119223733E-6)
    miles_str = print(f"\t{miles} Miles (mi)")
    meters = (centimeters * 0.01)
    meters_str = print(f"\t{meters} Meters (m)")
    kilometers = (centimeters * 1.00E-5)
    kilometers_str = print(f"\t{kilometers} Kilometers (km)")
    millimeters = (centimeters * 10)
    millimeters_str = print(f"\t{millimeters} Millimeters (mm)")
    micrometers = (centimeters * 10000)
    micrometers_str = print(f"\t{micrometers} Micrometers (µm)")
    nanometers = (centimeters * 10000000)
    nanometers_str = print(f"\t{nanometers} Nanometers (nm)")
    yards = (centimeters * 0.010936133)
    yards_str = print(f"\t{yards} Yards (yd)")
    feet = (centimeters * 0.032808399)
    feet_str = print(f"\t{feet} Feet (ft)")
    inches = (centimeters * 0.3937007874)
    inches_str = print(f"\t{inches} Inches (in)")
    nautical_miles = (centimeters * 5.3961182483769E-6)
    nautical_miles_str = print(f"\t{nautical_miles} Nautical Miles (NM)")
    light_years = (centimeters * 1.0570008340247E-18)
    light_years_str = print(f"\t{light_years} Light Years (ly)")
    parsecs = (centimeters * 3.2407792896664E-19)
    parsecs_str = print(f"\t{parsecs} Parsecs (pc)")
    kiloparsecs = (centimeters * 3.2407792896664E-22)
    kiloparsecs_str = print(f"\t{kiloparsecs} Kiloparsecs (kpc)")
    megaparsecs = (centimeters * 3.2407792896664E-25)
    megaparsecs_str = print(f"\t{megaparsecs} Megaparsecs (Mpc)")
    astronomical_units = (centimeters * 6.6845871226706E-14)
    astronomical_units_str = print(f"\t{astronomical_units} Astronomical Units (AU)")
    return miles_str, meters_str, kilometers_str, millimeters_str, micrometers_str, nanometers_str, yards_str, feet_str, inches_str, nautical_miles_str, light_years_str, parsecs_str, kiloparsecs_str, megaparsecs_str, astronomical_units_str

def millimeters_input(millimeters):
    miles = (millimeters * 6.2137119223733E-7)
    miles_str = print(f"\t{miles} Miles (mi)")
    meters = (millimeters * 0.001)
    meters_str = print(f"\t{meters} Meters (m)")
    kilometers = (millimeters * 1.00E-6)
    kilometers_str = print(f"\t{kilometers} Kilometers (km)")
    centimeters = (millimeters * 0.1)
    centimeters_str = print(f"\t{centimeters} Centimeters (cm)")
    micrometers = (millimeters * 1000)
    micrometers_str = print(f"\t{micrometers} Micrometers (µm)")
    nanometers = (millimeters * 1000000)
    nanometers_str = print(f"\t{nanometers} Nanometers (nm)")
    yards = (millimeters * 0.0010936133)
    yards_str = print(f"\t{yards} Yards (yd)")
    feet = (millimeters * 0.0032808399)
    feet_str = print(f"\t{feet} Feet (ft)")
    inches = (millimeters * 0.0393700787)
    inches_str = print(f"\t{inches} Inches (in)")
    nautical_miles = (millimeters * 5.3961182483768E-7)
    nautical_miles_str = print(f"\t{nautical_miles} Nautical Miles (NM)")
    light_years = (millimeters * 1.0570008340247E-19)
    light_years_str = print(f"\t{light_years} Light Years (ly)")
    parsecs = (millimeters * 3.2407792896664E-20)
    parsecs_str = print(f"\t{parsecs} Parsecs (pc)")
    kiloparsecs = (millimeters * 3.2407792896664E-23)
    kiloparsecs_str = print(f"\t{kiloparsecs} Kiloparsecs (kpc)")
    megaparsecs = (millimeters * 3.2407792896664E-26)
    megaparsecs_str = print(f"\t{megaparsecs} Megaparsecs (Mpc)")
    astronomical_units = (millimeters * 6.6845871226706E-15)
    astronomical_units_str = print(f"\t{astronomical_units} Astronomical Units (AU)")
    return miles_str, meters_str, kilometers_str, centimeters_str, micrometers_str, nanometers_str, yards_str, feet_str, inches_str, nautical_miles_str, light_years_str, parsecs_str, kiloparsecs_str, megaparsecs_str, astronomical_units_str

def micrometers_input(micrometers):
    miles = (micrometers * 6.2137119223733E-10)
    miles_str = print(f"\t{miles} Miles (mi)")
    meters = (micrometers * 1.00E-6)
    meters_str = print(f"\t{meters} Meters (m)")
    kilometers = (micrometers * 1.00E-9)
    kilometers_str = print(f"\t{kilometers} Kilometers (km)")
    centimeters = (micrometers * 0.0001)
    centimeters_str = print(f"\t{centimeters} Centimeters (cm)")
    millimeters = (micrometers * 0.001)
    millimeters_str = print(f"\t{millimeters} Millimeters (mm)")
    nanometers = (micrometers * 1000)
    nanometers_str = print(f"\t{nanometers} Nanometers (nm)")
    yards = (micrometers * 1.0936132983377E-6)
    yards_str = print(f"\t{yards} Yards (yd)")
    feet = (micrometers * 3.2808398950131E-6)
    feet_str = print(f"\t{feet} Feet (ft)")
    inches = (micrometers * 3.93701E-5)
    inches_str = print(f"\t{inches} Inches (in)")
    nautical_miles = (micrometers * 5.3961182483769E-10)
    nautical_miles_str = print(f"\t{nautical_miles} Nautical Miles (NM)")
    light_years = (micrometers * 1.0570008340247E-22)
    light_years_str = print(f"\t{light_years} Light Years (ly)")
    parsecs = (micrometers * 3.2407792896664E-23)
    parsecs_str = print(f"\t{parsecs} Parsecs (pc)")
    kiloparsecs = (micrometers * 3.2407792896664E-26)
    kiloparsecs_str = print(f"\t{kiloparsecs} Kiloparsecs (kpc)")
    megaparsecs = (micrometers * 3.2407792896664E-29)
    megaparsecs_str = print(f"\t{megaparsecs} Megaparsecs (Mpc)")
    astronomical_units = (micrometers * 6.6845871226706E-18)
    astronomical_units_str = print(f"\t{astronomical_units} Astronomical Units (AU)")
    return miles_str, meters_str, kilometers_str, centimeters_str, millimeters_str, nanometers_str, yards_str, feet_str, inches_str, nautical_miles_str, light_years_str, parsecs_str, kiloparsecs_str, megaparsecs_str, astronomical_units_str

def nanometers_input(nanometers):
    miles = (nanometers * 6.2137119223733E-13)
    miles_str = print(f"\t{miles} Miles (mi)")
    meters = (nanometers * 1.00E-9)
    meters_str = print(f"\t{meters} Meters (m)")
    kilometers = (nanometers * 1.00E-12)
    kilometers_str = print(f"\t{kilometers} Kilometers (km)")
    centimeters = (nanometers * 1.00E-7)
    centimeters_str = print(f"\t{centimeters} Centimeters (cm)")
    millimeters = (nanometers * 1.00E-6)
    millimeters_str = print(f"\t{millimeters} Millimeters (mm)")
    micrometers = (nanometers * 0.001)
    micrometers_str = print(f"\t{micrometers} Micrometers (µm)")
    yards = (nanometers * 1.0936132983377E-9)
    yards_str = print(f"\t{yards} Yards (yd)")
    feet = (nanometers * 3.2808398950131E-9)
    feet_str = print(f"\t{feet} Feet (ft)")
    inches = (nanometers * 3.9370078740157E-8)
    inches_str = print(f"\t{inches} Inches (in)")
    nautical_miles = (nanometers * 5.3961182483768E-13)
    nautical_miles_str = print(f"\t{nautical_miles} Nautical Miles (NM)")
    light_years = (nanometers * 1.0570008340247E-25)
    light_years_str = print(f"\t{light_years} Light Years (ly)")
    parsecs = (nanometers * 3.2407792896664E-26)
    parsecs_str = print(f"\t{parsecs} Parsecs (pc)")
    kiloparsecs = (nanometers * 3.2407792896664E-29)
    kiloparsecs_str = print(f"\t{kiloparsecs} Kiloparsecs (kpc)")
    megaparsecs = (nanometers * 3.2407792896664E-32)
    megaparsecs_str = print(f"\t{megaparsecs} Megaparsecs (Mpc)")
    astronomical_units = (nanometers * 6.6845871226706E-21)
    astronomical_units_str = print(f"\t{astronomical_units} Astronomical Units (AU)")
    return miles_str, meters_str, kilometers_str, centimeters_str, millimeters_str, micrometers_str, yards_str, feet_str, inches_str, nautical_miles_str, light_years_str, parsecs_str, kiloparsecs_str, megaparsecs_str, astronomical_units_str

def yards_input(yards):
    miles = (yards * 0.0005681818)
    miles_str = print(f"\t{miles} Miles (mi)")
    meters = (yards * 0.9144)
    meters_str = print(f"\t{meters} Meters (m)")
    kilometers = (yards * 0.0009144)
    kilometers_str = print(f"\t{kilometers} Kilometers (km)")
    centimeters = (yards * 91.44)
    centimeters_str = print(f"\t{centimeters} Centimeters (cm)")
    millimeters = (yards * 914.4)
    millimeters_str = print(f"\t{millimeters} Millimeters (mm)")
    micrometers = (yards * 914400)
    micrometers_str = print(f"\t{micrometers} Micrometers (µm)")
    nanometers = (yards * 914400000)
    nanometers_str = print(f"\t{nanometers} Nanometers (nm)")
    feet = (yards * 3)
    feet_str = print(f"\t{feet} Feet (ft)")
    inches = (yards * 36)
    inches_str = print(f"\t{inches} Inches (in)")
    nautical_miles = (yards * 0.0004934211)
    nautical_miles_str = print(f"\t{nautical_miles} Nautical Miles (NM)")
    light_years = (yards * 9.6652156263218E-17)
    light_years_str = print(f"\t{light_years} Light Years (ly)")
    parsecs = (yards * 2.9633685824709E-17)
    parsecs_str = print(f"\t{parsecs} Parsecs (pc)")
    kiloparsecs = (yards * 2.9633685824709E-20)
    kiloparsecs_str = print(f"\t{kiloparsecs} Kiloparsecs (kpc)")
    megaparsecs = (yards * 2.9633685824709E-23)
    megaparsecs_str = print(f"\t{megaparsecs} Megaparsecs (Mpc)")
    astronomical_units = (yards * 6.11238646497E-12)
    astronomical_units_str = print(f"\t{astronomical_units} Astronomical Units (AU)")
    return miles_str, meters_str, kilometers_str, centimeters_str, millimeters_str, micrometers_str, nanometers_str, feet_str, inches_str, nautical_miles_str, light_years_str, parsecs_str, kiloparsecs_str, megaparsecs_str, astronomical_units_str

def feet_input(feet):
    miles = (feet * 0.0001893939)
    miles_str = print(f"\t{miles} Miles (mi)")
    meters = (feet * 0.3048)
    meters_str = print(f"\t{meters} Meters (m)")
    kilometers = (feet * 0.0003048)
    kilometers_str = print(f"\t{kilometers} Kilometers (km)")
    centimeters = (feet * 30.48)
    centimeters_str = print(f"\t{centimeters} Centimeters (cm)")
    millimeters = (feet * 304.8)
    millimeters_str = print(f"\t{millimeters} Millimeters (mm)")
    micrometers = (feet * 304800)
    micrometers_str = print(f"\t{micrometers} Micrometers (µm)")
    nanometers = (feet * 304800000)
    nanometers_str = print(f"\t{nanometers} Nanometers (nm)")
    yards = (feet * 0.3333333333)
    yards_str = print(f"\t{yards} Yards (yd)")
    inches = (feet * 12)
    inches_str = print(f"\t{inches} Inches (in)")
    nautical_miles = (feet * 0.0001644737)
    nautical_miles_str = print(f"\t{nautical_miles} Nautical Miles (NM)")
    light_years = (feet * 3.2217385421073E-17)
    light_years_str = print(f"\t{light_years} Light Years (ly)")
    parsecs = (feet * 9.8778952749031E-18)
    parsecs_str = print(f"\t{parsecs} Parsecs (pc)")
    kiloparsecs = (feet * 9.8778952749031E-21)
    kiloparsecs_str = print(f"\t{kiloparsecs} Kiloparsecs (kpc)")
    megaparsecs = (feet * 9.8778952749031E-24)
    megaparsecs_str = print(f"\t{megaparsecs} Megaparsecs (Mpc)")
    astronomical_units = (feet * 2.03746215499E-12)
    astronomical_units_str = print(f"\t{astronomical_units} Astronomical Units (AU)")
    return miles_str, meters_str, kilometers_str, centimeters_str, millimeters_str, micrometers_str, nanometers_str, yards_str, inches_str, nautical_miles_str, light_years_str, parsecs_str, kiloparsecs_str, megaparsecs_str, astronomical_units_str

def inches_input(inches):
    miles = (inches * 1.57828E-5)
    miles_str = print(f"\t{miles} Miles (mi)")
    meters = (inches * 0.0254)
    meters_str = print(f"\t{meters} Meters (m)")
    kilometers = (inches * 2.54E-5)
    kilometers_str = print(f"\t{kilometers} Kilometers (km)")
    centimeters = (inches * 2.54)
    centimeters_str = print(f"\t{centimeters} Centimeters (cm)")
    millimeters = (inches * 25.4)
    millimeters_str = print(f"\t{millimeters} Millimeters (mm)")
    micrometers = (inches * 25400)
    micrometers_str = print(f"\t{micrometers} Micrometers (µm)")
    nanometers = (inches * 25400000)
    nanometers_str = print(f"\t{nanometers} Nanometers (nm)")
    yards = (inches * 0.0277777778)
    yards_str = print(f"\t{yards} Yards (yd)")
    feet = (inches * 0.0833333333)
    feet_str = print(f"\t{feet} Feet (ft)")
    nautical_miles = (inches * 1.37061E-5)
    nautical_miles_str = print(f"\t{nautical_miles} Nautical Miles (NM)")
    light_years = (inches * 2.6847821184227E-18)
    light_years_str = print(f"\t{light_years} Light Years (ly)")
    parsecs = (inches * 8.2315793957526E-19)
    parsecs_str = print(f"\t{parsecs} Parsecs (pc)")
    kiloparsecs = (inches * 8.2315793957526E-22)
    kiloparsecs_str = print(f"\t{kiloparsecs} Kiloparsecs (kpc)")
    megaparsecs = (inches * 8.2315793957526E-25)
    megaparsecs_str = print(f"\t{megaparsecs} Megaparsecs (Mpc)")
    astronomical_units = (inches * 1.6978851291583E-13)
    astronomical_units_str = print(f"\t{astronomical_units} Astronomical Units (AU)")
    return miles_str, meters_str, kilometers_str, centimeters_str, millimeters_str, micrometers_str, nanometers_str, yards_str, feet_str, nautical_miles_str, light_years_str, parsecs_str, kiloparsecs_str, megaparsecs_str, astronomical_units_str

def nautical_miles_input(nautical_miles):
    miles = (nautical_miles * 1.1515151515)
    miles_str = print(f"\t{miles} Miles (mi)")
    meters = (nautical_miles * 1853.184)
    meters_str = print(f"\t{meters} Meters (m)")
    kilometers = (nautical_miles * 1.853184)
    kilometers_str = print(f"\t{kilometers} Kilometers (km)")
    centimeters = (nautical_miles * 185318.4)
    centimeters_str = print(f"\t{centimeters} Centimeters (cm)")
    millimeters = (nautical_miles * 1853184)
    millimeters_str = print(f"\t{millimeters} Millimeters (mm)")
    micrometers = (nautical_miles * 1853184000)
    micrometers_str = print(f"\t{micrometers} Micrometers (µm)")
    nanometers = (nautical_miles * 1853184000000)
    nanometers_str = print(f"\t{nanometers} Nanometers (nm)")
    yards = (nautical_miles * 2026.6666666667)
    yards_str = print(f"\t{yards} Yards (yd)")
    feet = (nautical_miles * 6080)
    feet_str = print(f"\t{feet} Feet (ft)")
    inches = (nautical_miles * 72960)
    inches_str = print(f"\t{inches} Inches (in)")
    light_years = (nautical_miles * 1.9588170336012E-13)
    light_years_str = print(f"\t{light_years} Light Years (ly)")
    parsecs = (nautical_miles * 6.0057603271411E-14)
    parsecs_str = print(f"\t{parsecs} Parsecs (pc)")
    kiloparsecs = (nautical_miles * 6.0057603271411E-17)
    kiloparsecs_str = print(f"\t{kiloparsecs} Kiloparsecs (kpc)")
    megaparsecs = (nautical_miles * 6.0057603271411E-20)
    megaparsecs_str = print(f"\t{megaparsecs} Megaparsecs (Mpc)")
    astronomical_units = (nautical_miles * 1.2387769902339E-8)
    astronomical_units_str = print(f"\t{astronomical_units} Astronomical Units (AU)")
    return miles_str, meters_str, kilometers_str, centimeters_str, millimeters_str, micrometers_str, nanometers_str, yards_str, feet_str, inches_str, light_years_str, parsecs_str, kiloparsecs_str, megaparsecs_str, astronomical_units_str

def light_years_input(light_years):
    miles = (light_years * 5878625373183.1)
    miles_str = print(f"\t{miles} Miles (mi)")
    meters = (light_years * 9.46073047258E+15)
    meters_str = print(f"\t{meters} Meters (m)")
    kilometers = (light_years * 9460730472580)
    kilometers_str = print(f"\t{kilometers} Kilometers (km)")
    centimeters = (light_years * 9.46073047258E+17)
    centimeters_str = print(f"\t{centimeters} Centimeters (cm)")
    millimeters = (light_years * 9.46073047258E+18)
    millimeters_str = print(f"\t{millimeters} Millimeters (mm)")
    micrometers = (light_years * 9.46073047258E+21)
    micrometers_str = print(f"\t{micrometers} Micrometers (µm)")
    nanometers = (light_years * 9.46073047258E+24)
    nanometers_str = print(f"\t{nanometers} Nanometers (nm)")
    yards = (light_years * 1.0346380656802E+16)
    yards_str = print(f"\t{yards} Yards (yd)")
    feet = (light_years * 3.1039141970407E+16)
    feet_str = print(f"\t{feet} Feet (ft)")
    inches = (light_years * 3.7246970364488E+17)
    inches_str = print(f"\t{inches} Inches (in)")
    nautical_miles = (light_years * 5105122034606.4)
    nautical_miles_str = print(f"\t{nautical_miles} Nautical Miles (NM)")
    parsecs = (light_years * 0.3066013938)
    parsecs_str = print(f"\t{parsecs} Parsecs (pc)")
    kiloparsecs = (light_years * 0.0003066014)
    kiloparsecs_str = print(f"\t{kiloparsecs} Kiloparsecs (kpc)")
    megaparsecs = (light_years * 3.0660139380653E-7)
    megaparsecs_str = print(f"\t{megaparsecs} Megaparsecs (Mpc)")
    astronomical_units = (light_years * 63241.077088066)
    astronomical_units_str = print(f"\t{astronomical_units} Astronomical Units (AU)")
    return miles_str, meters_str, kilometers_str, centimeters_str, millimeters_str, micrometers_str, nanometers_str, yards_str, feet_str, inches_str, nautical_miles_str, parsecs_str, kiloparsecs_str, megaparsecs_str, astronomical_units_str

def parsecs_input(parsecs):
    miles = (parsecs * 19173511575400)
    miles_str = print(f"\t{miles} Miles (mi)")
    meters = (parsecs * 3.08567758128E+16)
    meters_str = print(f"\t{meters} Meters (m)")
    kilometers = (parsecs * 30856775812800)
    kilometers_str = print(f"\t{kilometers} Kilometers (km)")
    centimeters = (parsecs * 3.08567758128E+18)
    centimeters_str = print(f"\t{centimeters} Centimeters (cm)")
    millimeters = (parsecs * 3.08567758128E+19)
    millimeters_str = print(f"\t{millimeters} Millimeters (mm)")
    micrometers = (parsecs * 3.08567758128E+22)
    micrometers_str = print(f"\t{micrometers} Micrometers (µm)")
    nanometers = (parsecs * 3.08567758128E+25)
    nanometers_str = print(f"\t{nanometers} Nanometers (nm)")
    yards = (parsecs * 3.3745380372703E+16)
    yards_str = print(f"\t{yards} Yards (yd)")
    feet = (parsecs * 1.0123614111811E+17)
    feet_str = print(f"\t{feet} Feet (ft)")
    inches = (parsecs * 1.2148336934173E+18)
    inches_str = print(f"\t{inches} Inches (in)")
    nautical_miles = (parsecs * 16650681104952)
    nautical_miles_str = print(f"\t{nautical_miles} Nautical Miles (NM)")
    light_years = (parsecs * 3.2615637769)
    light_years_str = print(f"\t{light_years} Light Years (ly)")
    kiloparsecs = (parsecs * 0.001)
    kiloparsecs_str = print(f"\t{kiloparsecs} Kiloparsecs (kpc)")
    megaparsecs = (parsecs * 1.00E-6)
    megaparsecs_str = print(f"\t{megaparsecs} Megaparsecs (Mpc)")
    astronomical_units = (parsecs * 206264.80624538)
    astronomical_units_str = print(f"\t{astronomical_units} Astronomical Units (AU)")
    return miles_str, meters_str, kilometers_str, centimeters_str, millimeters_str, micrometers_str, nanometers_str, yards_str, feet_str, inches_str, nautical_miles_str, light_years_str, kiloparsecs_str, megaparsecs_str, astronomical_units_str

def kiloparsecs_input(kiloparsecs):
    miles = (kiloparsecs * 1.91735115754E+16)
    miles_str = print(f"\t{miles} Miles (mi)")
    meters = (kiloparsecs * 3.08567758128E+19)
    meters_str = print(f"\t{meters} Meters (m)")
    kilometers = (kiloparsecs * 3.08567758128E+16)
    kilometers_str = print(f"\t{kilometers} Kilometers (km)")
    centimeters = (kiloparsecs * 3.08567758128E+21)
    centimeters_str = print(f"\t{centimeters} Centimeters (cm)")
    millimeters = (kiloparsecs * 3.08567758128E+22)
    millimeters_str = print(f"\t{millimeters} Millimeters (mm)")
    micrometers = (kiloparsecs * 3.08567758128E+25)
    micrometers_str = print(f"\t{micrometers} Micrometers (µm)")
    nanometers = (kiloparsecs * 3.08567758128E+28)
    nanometers_str = print(f"\t{nanometers} Nanometers (nm)")
    yards = (kiloparsecs * 3.3745380372703E+19)
    yards_str = print(f"\t{yards} Yards (yd)")
    feet = (kiloparsecs * 1.0123614111811E+20)
    feet_str = print(f"\t{feet} Feet (ft)")
    inches = (kiloparsecs * 1.2148336934173E+21)
    inches_str = print(f"\t{inches} Inches (in)")
    nautical_miles = (kiloparsecs * 1.6650681104952E+16)
    nautical_miles_str = print(f"\t{nautical_miles} Nautical Miles (NM)")
    light_years = (kiloparsecs * 3261.5637769443)
    light_years_str = print(f"\t{light_years} Light Years (ly)")
    parsecs = (kiloparsecs * 1000)
    parsecs_str = print(f"\t{parsecs} Parsecs (pc)")
    megaparsecs = (kiloparsecs * 0.001)
    megaparsecs_str = print(f"\t{megaparsecs} Megaparsecs (Mpc)")
    astronomical_units = (kiloparsecs * 206264806.24538)
    astronomical_units_str = print(f"\t{astronomical_units} Astronomical Units (AU)")
    return miles_str, meters_str, kilometers_str, centimeters_str, millimeters_str, micrometers_str, nanometers_str, yards_str, feet_str, inches_str, nautical_miles_str, light_years_str, parsecs_str, megaparsecs_str, astronomical_units_str

def megaparsecs_input(megaparsecs):
    miles = (megaparsecs * 1.91735115754E+19)
    miles_str = print(f"\t{miles} Miles (mi)")
    meters = (megaparsecs * 3.08567758128E+22)
    meters_str = print(f"\t{meters} Meters (m)")
    kilometers = (megaparsecs * 3.08567758128E+19)
    kilometers_str = print(f"\t{kilometers} Kilometers (km)")
    centimeters = (megaparsecs * 3.08567758128E+24)
    centimeters_str = print(f"\t{centimeters} Centimeters (cm)")
    millimeters = (megaparsecs * 3.08567758128E+25)
    millimeters_str = print(f"\t{millimeters} Millimeters (mm)")
    micrometers = (megaparsecs * 3.08567758128E+28)
    micrometers_str = print(f"\t{micrometers} Micrometers (µm)")
    nanometers = (megaparsecs * 3.08567758128E+31)
    nanometers_str = print(f"\t{nanometers} Nanometers (nm)")
    yards = (megaparsecs * 3.3745380372703E+22)
    yards_str = print(f"\t{yards} Yards (yd)")
    feet = (megaparsecs * 1.0123614111811E+23)
    feet_str = print(f"\t{feet} Feet (ft)")
    inches = (megaparsecs * 1.2148336934173E+24)
    inches_str = print(f"\t{inches} Inches (in)")
    nautical_miles = (megaparsecs * 1.6650681104952E+19)
    nautical_miles_str = print(f"\t{nautical_miles} Nautical Miles (NM)")
    light_years = (megaparsecs * 3261563.7769443)
    light_years_str = print(f"\t{light_years} Light Years (ly)")
    parsecs = (megaparsecs * 1000000)
    parsecs_str = print(f"\t{parsecs} Parsecs (pc)")
    kiloparsecs = (megaparsecs * 1000)
    kiloparsecs_str = print(f"\t{kiloparsecs} Kiloparsecs (kpc)")
    astronomical_units = (megaparsecs * 206264806245.38)
    astronomical_units_str = print(f"\t{astronomical_units} Astronomical Units (AU)")
    return miles_str, meters_str, kilometers_str, centimeters_str, millimeters_str, micrometers_str, nanometers_str, yards_str, feet_str, inches_str, nautical_miles_str, light_years_str, parsecs_str, kiloparsecs_str, astronomical_units_str

def astronomical_units_input(astronomical_units):
    miles = (astronomical_units * 92955807.267433)
    miles_str = print(f"\t{miles} Miles (mi)")
    meters = (astronomical_units * 149597870691)
    meters_str = print(f"\t{meters} Meters (m)")
    kilometers = (astronomical_units * 149597870.691)
    kilometers_str = print(f"\t{kilometers} Kilometers (km)")
    centimeters = (astronomical_units * 14959787069100)
    centimeters_str = print(f"\t{centimeters} Centimeters (cm)")
    millimeters = (astronomical_units * 1.49597870691E+14)
    millimeters_str = print(f"\t{millimeters} Millimeters (mm)")
    micrometers = (astronomical_units * 1.49597870691E+17)
    micrometers_str = print(f"\t{micrometers} Micrometers (µm)")
    nanometers = (astronomical_units * 1.49597870691E+20)
    nanometers_str = print(f"\t{nanometers} Nanometers (nm)")
    yards = (astronomical_units * 163602220790.68)
    yards_str = print(f"\t{yards} Yards (yd)")
    feet = (astronomical_units * 490806662372.05)
    feet_str = print(f"\t{feet} Feet (ft)")
    inches = (astronomical_units * 5889679948464.6)
    inches_str = print(f"\t{inches} Inches (in)")
    nautical_miles = (astronomical_units * 80724779.995403)
    nautical_miles_str = print(f"\t{nautical_miles} Nautical Miles (NM)")
    light_years = (astronomical_units * 4.8481368111358E-6)
    light_years_str = print(f"\t{light_years} Light Years (ly)")
    parsecs = (astronomical_units * 4.8481368111358E-6)
    parsecs_str = print(f"\t{parsecs} Parsecs (pc)")
    kiloparsecs = (astronomical_units * 4.8481368111358E-9)
    kiloparsecs_str = print(f"\t{kiloparsecs} Kiloparsecs (kpc)")
    megaparsecs = (astronomical_units * 4.8481368111358E-12)
    megaparsecs_str = print(f"\t{megaparsecs} Megaparsecs (Mpc)")
    return miles_str, meters_str, kilometers_str, centimeters_str, millimeters_str, micrometers_str, nanometers_str, yards_str, feet_str, inches_str, nautical_miles_str, light_years_str, parsecs_str, kiloparsecs_str, megaparsecs_str

# Check whether the input is valid, and if so - whether it's an integer, scientific number or floating number
def float_test(examine):
    str_test = str(examine)
    if 'e' in str_test.lower():
        print(f"\n\t{examine}: Detected an 'e' in the input, evaluating if input is scientific notation.\n")
        time.sleep(1)
        try:
            val = float(examine)
            print(f"\n\t{examine} can be converted to a float or scientific number and is acceptable to evaluate: \n\t{val}")
            time.sleep(1)
        except ValueError:
            print(f"\t\n'{examine}' is a string and not acceptable to evaluate.\n")
            print(f"The program will reset in five seconds.")
            time.sleep(5)
            clear = lambda: os.system('cls')
            clear()
            main_program()
    else:
        try:
            val = int(examine)
            print(f"\n\t{val} appears to be an integer and acceptable to evaluate.")
            time.sleep(1)
        except ValueError:
                try:
                    val = float(examine)
                    print(f"\t{val} appears to be a float number and acceptable to evaluate.")
                    time.sleep(1)
                except ValueError:
                    print(f"\t\n'{examine}' is a string and not acceptable to evaluate.\n")
                    print(f"The program will reset in five seconds.")
                    time.sleep(5)
                    clear = lambda: os.system('cls')
                    clear()
                    main_program()

# Breaking out copyright/credit and allow for sub-routine
def main_program():
    print("-=-=   Cosmic Matter - Unit Converter     =-=-")
    print("-=-=   by: Ira Bell       Version 0.1     =-=-")
    print("-=-=   Copyright (c) 2022 Space Elements  =-=-")
    sub_program()

# Main sub-routine
def sub_program():
   
    while True:
        print(f"\nPlease input the unit classification you would like to convert from\n(note: this is case sensitive)\n\n[Options]:\n\n[mi, m, km, cm, mm, micrometers, nm, yd, ft, in, NM, ly, pc, \nkpc, Mpc, AU], 'cls' to clear screen or 'q' to quit.")
       
        unit_classification = input("\n>>> ")
       
        # User wants to quit
        if unit_classification == 'q' or unit_classification == 'Q' or unit_classification == 'quit' or unit_classification == 'QUIT':
            quit()
        # Miles
        if unit_classification == 'mi':
            print("\nYou have selected Miles.\n")
            miles = input("Please enter the distance in Miles that you would like to convert.\n\n>>> ")
            print("\n...inspecting...")
            float_test(miles)
            print("\n...calculating...")
            print(f"\n{miles} Miles converts to:\n")
            miles_input(float(miles))
        elif unit_classification == 'm':
            print("\nYou have selected Meters.\n")
            meters = input("Please enter the distance in Meters that you would like to convert.\n\n>>> ")
            print("\n...inspecting...")
            float_test(meters)
            print("\n...calculating...")
            print(f"\n{meters} Meters converts to:\n")
            meters_input(float(meters))
        # Kilometers
        elif unit_classification == 'km':
            print("\nYou have selected Kilometers.\n")
            kilometers = input("Please enter the distance in Kilometers that you would like to convert.\n\n>>> ")
            print("\n...inspecting...")
            float_test(kilometers)
            print("\n...calculating...")
            print(f"\n{kilometers} Kilometers converts to:\n")
            kilometers_input(float(kilometers))
        # Centimeters
        elif unit_classification == 'cm':
            print("\nYou have selected Centimeters.\n")
            centimeters = input("Please enter the distance in Centimeters that you would like to convert.\n\n>>> ")
            print("\n...inspecting...")
            float_test(centimeters)
            print("\n...calculating...")
            print(f"\n{centimeters} Centimeters converts to:\n")
            centimeters_input(float(centimeters))
        # Millimeters
        elif unit_classification == 'mm':
            print("\nYou have selected Millimeters.\n")
            millimeters = input("Please enter the distance in Kilometers that you would like to convert.\n\n>>> ")
            print("\n...inspecting...")
            float_test(millimeters)
            print("\n...calculating...")
            print(f"\n{millimeters} Millimeters converts to:\n")
            millimeters_input(float(millimeters))
        # Micrometers
        elif unit_classification == 'µm' or unit_classification == 'micrometers' or unit_classification == 'Micrometers' or unit_classification == 'MICROMETERS':
            print("\nYou have selected Micrometers.\n")
            micrometers = input("Please enter the distance in Micrometers that you would like to convert.\n\n>>> ")
            print("\n...inspecting...")
            float_test(micrometers)
            print("\n...calculating...")
            print(f"\n{micrometers} Micrometers converts to:\n")
            micrometers_input(float(micrometers))
        # Nanometers
        elif unit_classification == 'nm':
            print("\nYou have selected Nanometers.\n")
            nanometers = input("Please enter the distance in Nanometers that you would like to convert.\n\n>>> ")
            print("\n...inspecting...")
            float_test(nanometers)
            print("\n...calculating...")
            print(f"\n{nanometers} Nanometers converts to:\n")
            nanometers_input(float(nanometers))
        # Yards
        elif unit_classification == 'yd':
            print("\nYou have selected Yards.\n")
            yards = input("Please enter the distance in Yards that you would like to convert.\n\n>>> ")
            print("\n...inspecting...")
            float_test(yards)
            print("\n...calculating...")
            print(f"\n{yards} Yards converts to:\n")
            yards_input(float(yards))
        # Feet
        elif unit_classification == 'ft':
            print("\nYou have selected Feet.\n")
            feet = input("Please enter the distance in Feet that you would like to convert.\n\n>>> ")
            print("\n...inspecting...")
            float_test(feet)
            print("\n...calculating...")
            print(f"\n{feet} Feet converts to:\n")
            feet_input(float(feet))
        # Inches
        elif unit_classification == 'in':
            print("\nYou have selected Inches.\n")
            inches = input("Please enter the distance in Inches that you would like to convert.\n\n>>> ")
            print("\n...inspecting...")
            float_test(inches)
            print("\n...calculating...")
            print(f"\n{inches} Inches converts to:\n")
            inches_input(float(inches))
        # Nautical Miles
        elif unit_classification == 'NM':
            print("\nYou have selected Nautical Miles.\n")
            nautical_miles = input("Please enter the distance in Nautical Miles that you would like to convert.\n\n>>> ")
            print("\n...inspecting...")
            float_test(nautical_miles)
            print("\n...calculating...")
            print(f"\n{nautical_miles} Nautical Miles converts to:\n")
            nautical_miles_input(float(nautical_miles))
        # Light Years
        elif unit_classification == 'ly':
            print("\nYou have selected Light Years.\n")
            light_years = input("Please enter the distance in Light Years that you would like to convert.\n\n>>> ")
            print("\n...inspecting...")
            float_test(light_years)
            print("\n...calculating...")
            print(f"\n{light_years} Light Years converts to:\n")
            light_years_input(float(light_years))
        # Parsecs
        elif unit_classification == 'pc':
            print("\nYou have selected Parsecs.\n")
            parsecs = input("Please enter the distance in Parsecs that you would like to convert.\n\n>>> ")
            print("\n...inspecting...")
            float_test(parsecs)
            print("\n...calculating...")
            print(f"\n{parsecs} Parsecs converts to:\n")
            parsecs_input(float(parsecs))
        # Kiloparsecs
        elif unit_classification == 'kpc':
            print("\nYou have selected Kiloparsecs.\n")
            kiloparsecs = input("Please enter the distance in Kiloparsecs that you would like to convert.\n\n>>> ")
            print("\n...inspecting...")
            float_test(kiloparsecs)
            print("\n...calculating...")
            print(f"\n{kiloparsecs} Kiloparsecs converts to:\n")
            kiloparsecs_input(float(kiloparsecs))
        # Megaparsecs
        elif unit_classification == 'Mpc':
            print("\nYou have selected Megaparsecs.\n")
            megaparsecs = input("Please enter the distance in Megaparsecs that you would like to convert.\n\n>>> ")
            print("\n...inspecting...")
            float_test(megaparsecs)
            print("\n...calculating...")
            print(f"\n{megaparsecs} Kilometers converts to:\n")
            megaparsecs_input(float(megaparsecs))
        # Astronomical Units
        elif unit_classification == 'AU':
            print("\nYou have selected Astronomical Units.\n")
            astronomical_units = input("Please enter the distance in Astronomical Units that you would like to convert.\n\n>>> ")
            print("\n...inspecting...")
            float_test(astronomical_units)
            print("\n...calculating...")
            print(f"\n{astronomical_units} Kilometers converts to:\n")
            astronomical_units_input(float(astronomical_units))
        else:
            clear = lambda: os.system('cls')
            clear()
            main_program()
        sub_program()
    sub_program()

# Run main program
main_program()
Post By: Ira Bell, Founder & CEO | Space Elements
Twitter | @IraLeeBell | GitHub @IraLeeBell
LinkedIn | www.linkedin.com/in/irabell/