Variables

[Richard Blackwood]

To All:

    Folks, I need your help. I have a friend who claims that if I write:

foo = 5

then foo is NOT a variable, necessarily. If you guys can define for me 
what a variable is and what qualifications you have to back you, I can 
pass this along to, hopefully, convince him that foo is indeed a variable.

Thanks all!

Richard B.