passing string from one file to another

[Ant]

I assume that you are trying to pass data from one 'standalone' cgi
script to another cgi script (mail.py). Depending on what exactly you
are trying to do, you could either set the information in a cookie, or
simply have a hidden input (<input type='hidden' name="data_to_pass_on"
value="bob">) element in the HTML which gets populated by the initial
cgi script and is then read by mail.py.