capitalize.py

from string import ascii_lowercase, ascii_uppercase


def capitalize(sentence: str) -> str:
 """
 This function will capitalize the first letter of a sentence or a word
 >>> capitalize("hello world")
 'Hello world'
 >>> capitalize("123 hello world")
 '123 hello world'
 >>> capitalize(" hello world")
 ' hello world'
 >>> capitalize("a")
 'A'
 >>> capitalize("")
 ''
 """
 if not sentence:
 return ""
 lower_to_upper = {lc: uc for lc, uc in zip(ascii_lowercase, ascii_uppercase)}
 return lower_to_upper.get(sentence[0], sentence[0]) + sentence[1:]


if __name__ == "__main__":
 from doctest import testmod

 testmod()