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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def token_list_len(tokenlist):
 """ Return the amount of characters in this token list. :param tokenlist: List of (token, text) or (token, text, mouse_handler) tuples. """

    ZeroWidthEscape = Token.ZeroWidthEscape
    return sum(len(item[1]) for item in tokenlist if item[0] != ZeroWidthEscape)