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def number_to_roman(number):
"""Convert a number between 1 and 3,999,999 to roman numerals."""
ROMAN_ONES = ['I', 'X', 'C', 'M', 'X̅', 'C̅', 'M̅']
ROMAN_FIVES = ['V', 'L', 'D', 'V̅', 'L̅', 'D̅']
conversion = ""
if not str(number).isnumeric():
return "Only numbers are allowed."
if int(number) > 3999999:
return "Please enter a number lower than 3,999,999."
for index, number in enumerate(str(number)[::-1]):
number = int(number)
if number in range(1, 4):
conversion += ROMAN_ONES[index] * number
elif number == 4:
conversion += ROMAN_FIVES[index] + ROMAN_ONES[index]
elif number == 5:
conversion += ROMAN_FIVES[index]
elif number in range(6, 9):
conversion += ROMAN_ONES[index] * (number % 5) + ROMAN_FIVES[index]
elif number == 9:
conversion += ROMAN_ONES[index + 1] + ROMAN_ONES[index]
return conversion[::-1]
if __name__ == '__main__':
number = input('Enter a number: ')
print(number_to_roman(number))
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