Any use of double-underscores is an indication that magic is at work. In this case the __contains__ method is intended to be called by the interpreter when you writeHello
I have been developing a code that works pretty well on my python 2.3 and now when i am running it on my server where it is programmed to run it's giving me errors. I have been using __contains__ method and it fails on python 2.2
For example
(Python 2.3) >> x="Hello World" >> print x.__contains__("Hello") True
(Python 2.2)
>>> x="Hello world" >>> print x.__contains__("Hello")
Traceback (most recent call last): File "<stdin>", line 1, in ? TypeError: 'in <string>' requires character as left operand
Is there any woraround for this or what am i doing wrong in 2.2 ?
Thanks
x in s
The __contains__ method was extended for strings in 2.3 so that construct could be used as a test to see whether s contained x as a substring. Before that, as the error message explains, it will only test to see whether a single character is contained in the string (by analogy with
1 in [3, 4, 5, 2]
in case you are interested).
So you'll need to use the .find() string method and say
if x.find("Hello") != -1:
... you found "Hello"because your ISP appears to be using an older version of Python than you.
regards Steve -- Meet the Python developers and your c.l.py favorites March 23-25 Come to PyCon DC 2005 http://www.pycon.org/ Steve Holden http://www.holdenweb.com/ -- http://mail.python.org/mailman/listinfo/python-list
