is there any principle when writing python function

[Ulrich Eckhardt]

smith jack wrote:
> i have heard that function invocation in python is expensive, but make
> lots of functions are a good design habit in many other languages, so
> is there any principle when writing python function?
> for example, how many lines should form a function?

Don't compromise the design and clarity of your code just because you heard 
some rumors about performance. Also, for any performance question, please 
consult a profiler.

Uli

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