help: Problem with cgi form

[Flavian Hardcastle]

Gustavo Cordova <gcordova at hebmex.com> wrote in 
news:mailman.1014420097.13372.python-list at python.org:

>> 
>> I'm a beginner. How do I do this? It's probly very simple ......
>> 
>> I have a hidden input on a cgi form... 
>> 
>>     print '<INPUT TYPE=HIDDEN NAME= "last_pos" 
>> VALUE=',last_byte_pos,'>'
>> 
>> I need the VALUE to be the  variable "last_byte_pos", but 
>> unfortunately when I run the script for the first time the script
>> crashes because it's 
>> undeclared. 
>> 
>> What subroutine do I use to check if last_byte_pos is undeclared, and 
>> assign it a default value if it is? 
>> 
> 
> How can you not know if "last_byte_pos" is undeclared?
> Have you assigned any values to it previously?
> no?
> 
> then it's undeclared.
> 
> -gus
I know when it's undeclared ... whenever a user first tries to access the 
form, it is undeclared. What I want to know is how to get the script to 
check whether this value has not been declared yet.


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