[docs] have a question about "strip"

[chinapython at yeah.net]

hi.all
       I'm robin.come from china,I have a question about "strip":
       version：Python 3.7.0
        >>> a='ea'
        >>> print([a.strip()])
        ['ea']
        >>> print([a.strip('page')])
        ['']
        >>> print([a.strip('ge')])
        ['a']
         is this a bug?





chinapython at yeah.net
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