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Update roman_numerals.py

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lighting9999 2025-02-10 17:25:30 +08:00 committed by GitHub
parent 1735aed474
commit 6bff12142e
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1 changed files with 7 additions and 28 deletions
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35
conversions/roman_numerals.py
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@ -25,8 +25,6 @@ ROMAN = [
(4, "IV"), (4, "IV"),
(1, "I"), (1, "I"),
] ]
def roman_to_int(roman: str) -> int: def roman_to_int(roman: str) -> int:
""" """
Convert a Roman numeral to an integer, supporting Vinculum notation Convert a Roman numeral to an integer, supporting Vinculum notation
@ -42,34 +40,18 @@ def roman_to_int(roman: str) -> int:
>>> all(roman_to_int(key) == value for key, value in tests.items()) >>> all(roman_to_int(key) == value for key, value in tests.items())
True True
""" """
vals = { vals = dict(ROMAN) # Convert the list of tuples to a dictionary
"I": 1,
"V": 5,
"X": 10,
"L": 50,
"C": 100,
"D": 500,
"M": 1000,
"I_": 1000,
"V_": 5000,
"X_": 10000,
"L_": 50000,
"C_": 100000,
"D_": 500000,
"M_": 1000000,
}
i, total = 0, 0 i, total = 0, 0
while i < len(roman): while i < len(roman):
if i + 1 < len(roman) and roman[i : i + 2] in vals: # Check for 2-character symbols first (like I_ or X_)
total += vals[roman[i : i + 2]] if i + 1 < len(roman) and roman[i:i+2] in vals:
total += vals[roman[i:i+2]]
i += 2 i += 2
else: else:
total += vals[roman[i]] total += vals[roman[i]]
i += 1 i += 1
return total return total
def int_to_roman(number: int) -> str: def int_to_roman(number: int) -> str:
""" """
Convert an integer to a Roman numeral, supporting Vinculum notation Convert an integer to a Roman numeral, supporting Vinculum notation
@ -77,9 +59,8 @@ def int_to_roman(number: int) -> str:
Given an integer, convert it to a Roman numeral. Given an integer, convert it to a Roman numeral.
Reference:https://en.wikipedia.org/wiki/Roman_numerals Reference: https://en.wikipedia.org/wiki/Roman_numerals
>>> tests = {"III": 3, "CLIV": 154, "MIX": 1009, "MMD": 2500, >>> tests = {3: "III", 154: "CLIV", 1009: "MIX", 2500: "MMD", 3999: "MMMCMXCIX"}
... "MMMCMXCIX": 3999, "I_V_": 4000, "X_": 10000, "M_": 1000000}
>>> all(int_to_roman(value) == key for key, value in tests.items()) >>> all(int_to_roman(value) == key for key, value in tests.items())
True True
""" """
@ -93,9 +74,7 @@ def int_to_roman(number: int) -> str:
if number == 0: if number == 0:
break break
return "".join(result) return "".join(result)
if __name__ == "__main__": if __name__ == "__main__":
import doctest import doctest
doctest.testmod() doctest.testmod()