[Chennaipy] doubt in a python

[anitha ganesan]

Hello all,

I am anitha ganesan, I am beginner for python, I have written a program to
get details and store in csv files. When I run it for first time i will get
answer, but if i wish to add some other input in that file, i am getting
error. My program is https://pastebin.com/eThD9LqN. and my error is
https://pastebin.com/xY6ExPRr.

could anyone clear my error.
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