strip bug?

[Eduardo]

Well, from the docstring of strip:

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S.strip([chars]) -> string or unicode

Return a copy of the string S with leading and trailing
whitespace removed.
If chars is given and not None, remove characters in chars instead.
If chars is unicode, S will be converted to unicode before stripping
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In this case 'http://thunder'.strip('http://') is the same as 'http://thunder'.strip('htp:/') and any character of the string that is passed to the method will be removed.