python错误提示：TypeError: 'builtin_function_or_method' object is not subscriptable

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换成
()

>>> yy.replace['a','s']
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'builtin_function_or_method' object is not subscriptable
>>> yy.replace('a','s')
'sbcdef'
>>>