請(qǐng)教一個(gè)py關(guān)鍵字參數(shù)問(wèn)題

本來(lái) endswith() 就沒(méi)有 start 和 end 參數(shù)，它的函數(shù)原型是這樣的

Docstring:
S.endswith(suffix[, start[, end]]) -> bool

Return True if S ends with the specified suffix, False otherwise.
With optional start, test S beginning at that position.
With optional end, stop comparing S at that position.
suffix can also be a tuple of strings to try.
Type:      builtin_function_or_method

只有函數(shù)原型是
endswith(suffix, start=0, end=-1)
或者
endswith(suffix, **kwargs)
時(shí)，才可以使用 endswith(xx, start=N, end=M) 方式調(diào)用。