feat(solutions): add roman-numerals/python/function

challenges/roman-numerals/solutions/python/function/README.md

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+# roman-numerals/python/function
+
+Created by [@Divlo](https://github.com/Divlo) on 30 June 2021.

challenges/roman-numerals/solutions/python/function/solution.py

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+from typing import List
+import sys
+
+matches_roman_arabic = [
+    {'arabic': 1000, 'roman': 'M'},
+    {'arabic': 900, 'roman': 'CM'},
+    {'arabic': 500, 'roman': 'D'},
+    {'arabic': 400, 'roman': 'CD'},
+    {'arabic': 100, 'roman': 'C'},
+    {'arabic': 90, 'roman': 'XC'},
+    {'arabic': 50, 'roman': 'L'},
+    {'arabic': 40, 'roman': 'XL'},
+    {'arabic': 10, 'roman': 'X'},
+    {'arabic': 9, 'roman': 'IX'},
+    {'arabic': 5, 'roman': 'V'},
+    {'arabic': 4, 'roman': 'IV'},
+    {'arabic': 1, 'roman': 'I'}
+]
+
+
+def convert_arabic_to_roman(arabic_number: int) -> str:
+    roman_number: str = ''
+    for match in matches_roman_arabic:
+        while arabic_number >= match['arabic']:
+            roman_number = roman_number + match['roman']
+            arabic_number = arabic_number - match['arabic']
+    return roman_number
+
+
+def convert_roman_to_arabic(roman_number: str) -> int:
+    arabic_number: int = 0
+    for match in matches_roman_arabic:
+        while True:
+            try:
+                if roman_number.index(match['roman']) == 0:
+                    arabic_number = arabic_number + match['arabic']
+                    roman_number = roman_number.replace(match['roman'], '', 1)
+                else:
+                    break
+            except ValueError:
+                break
+    return arabic_number
+
+
+input_values: List[str] = []
+for value in sys.stdin:
+    input_values.append(value.rstrip('\n'))
+
+convert_type = input_values[0]
+if convert_type == 'arabic to roman':
+    print(convert_arabic_to_roman(int(input_values[1])))
+else:
+    print(convert_roman_to_arabic(input_values[1]))