Integer conversion to roman literal

int_to_roman_literal.py

import math

# ================ Int to Roman ==================== #
RomanMapping = {
    1: 'I',
    4: 'IV',
    5: 'V',
    9: 'IX',
    10: 'X',
    40: 'XL',
    50: 'L',
    90: 'XC',
    100: 'C',
    400: 'CD',
    500: 'D',
    900: 'CM',
    1000: 'M'
}


def int_to_roman(number: int) -> str:
    roman_number = ""
    for num_key, roman_literal in sorted(RomanMapping.items(), reverse=True, key=lambda x: x[0]):
        while number >= num_key:
            number -= num_key
            roman_number += roman_literal
    return roman_number

  assert int_to_roman(1) == 'I'
assert int_to_roman(4) == 'IV'
assert int_to_roman(5) == 'V'
assert int_to_roman(9) == 'IX'
assert int_to_roman(10) == 'X'
assert int_to_roman(40) == 'XL'
assert int_to_roman(100) == 'C'
assert int_to_roman(400) == 'CD'
assert int_to_roman(500) == 'D'
assert int_to_roman(25) == 'XXV'
assert int_to_roman(26) == 'XXVI'
assert int_to_roman(27) == 'XXVII'


def countX_from_range(start: int, end: int) -> int:
    return sum(
        (int_to_roman(num)).count("X") for num in range(start, end + 1)
    )


assert countX_from_range(1, 10) == 2
assert (countX_from_range(1, 14)) == 6