importing module-performance

[S.Selvam Siva]

Hi all,
I have a small query,
Consider there is a task A which i want to perform.

To perform it ,i have two option.
1)Writing a small piece of code(approx. 50 lines) as efficient as possible.
2)import a suitable module to perform task A.


I am eager to know,which method will produce best performance?
-- 
Yours,
S.Selvam
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