NameError: name 'main' is not defined

Mon Sep 14 04:03:38 EDT 2009

On Monday 14 September 2009 03:43:19 Peng Yu wrote:
> Hi,
>> I try the following code. I don't quite understand why __main__ is not
> defined. Could somebody let me know what I am wrong about it?
>> Regards,
> Peng
>> $ cat test.py
> #!/usr/bin/env python
>> if __main__ == '__main__' :
> print "Hello World!\n"
> $ ./test.py
> Traceback (most recent call last):
> File "./test.py", line 3, in <module>
> if __main__ == '__main__' :
> NameError: name '__main__' is not defined

You are looking for __name__ , not __main__
if __name__ == '__main__':
 """We are at the top of the tree so run something"""
 print "Goodbye Cruel World"
- Hendrik