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34 lines
837 B
Python
34 lines
837 B
Python
def strip(user_string: str, characters: str = " \t\n\r") -> str:
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"""
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Remove leading and trailing characters (whitespace by default) from a string.
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Args:
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user_string (str): The input string to be stripped.
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characters (str, optional): Optional characters to be removed
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(default is whitespace).
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Returns:
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str: The stripped string.
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Examples:
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>>> strip(" hello ")
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'hello'
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>>> strip("...world...", ".")
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'world'
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>>> strip("123hello123", "123")
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'hello'
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>>> strip("")
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''
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"""
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start = 0
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end = len(user_string)
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while start < end and user_string[start] in characters:
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start += 1
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while end > start and user_string[end - 1] in characters:
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end -= 1
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return user_string[start:end]
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