[Tutor] use the data None

[Tehn Yit Chin]

Hi all,

I am trying to understand when it is appropriate to use None as in the
following example

if abc != None:
      print "abc is not None"

1) Can I use it to determine if the variable abc exists?
2) Can I use it to determine if the variable abc does not contain anything?

Many thanks

-- 
Tehn Yit Chin
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/tutor/attachments/20120603/bf5068f1/attachment.html>