[Tutor] Abt strings

[wonderer@pakistanmail.com]

Hi all
i m fairly new to python and it is driving me crazy.
I have a simple problem but i m unable to sort it out
My problem is like this.
I m using a function which takes a string argument and i usually pass it the
string in " " notation.
the problem is if i run this program once in a session the string is passed
and i get the results.
but if i call this function second time it gives message like
TypeError :this function requires a string with no null characters not a str

can any body help
TIA
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