strip.py

defstrip(user_string: str, characters: str=" \t\n\r") ->str:
"""
 Remove leading and trailing characters (whitespace by default) from a string.

 Args:
 user_string (str): The input string to be stripped.
 characters (str, optional): Optional characters to be removed
 (default is whitespace).

 Returns:
 str: The stripped string.

 Examples:
 >>> strip(" hello ")
 'hello'
 >>> strip("...world...", ".")
 'world'
 >>> strip("123hello123", "123")
 'hello'
 >>> strip("")
 ''
 """

start=0
end=len(user_string)

whilestart<endanduser_string[start] incharacters:
start+=1

whileend>startanduser_string[end-1] incharacters:
end-=1

returnuser_string[start:end]