Checking var is a number?

dav.phillips at dav.phillips at
Tue Jun 6 10:48:20 CEST 2006

I am very new to all this and need to know how to check
a variable to see if it is a number or not. Also can anyone
recommend a reference book apart from dive into python
preferably a reference with good examples of how to impliment

The project i have been given to work in is all CGI written
in Python.

Many Thanks 
David Phillips

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