>>> 'www.example.com'.strip('cmowz.')
'example'
+ The outermost leading and trailing *chars* argument values are stripped
+ from the string. Characters are removed from the leading end until
+ reaching a string character that is not contained in the set of
+ characters in *chars*. A similar action takes place on the trailing end.
+ For example::
+
+ >>> comment_string = '#....... Section 3.2.1 Issue #32 .......'
+ >>> comment_string.strip('.#! ')
+ 'Section 3.2.1 Issue #32'
+
.. method:: str.swapcase()