easy question on input files in Python

[robin.escalation at ACM.org]

"Alex Martelli" <aleaxit at yahoo.com> wrote:

>The one I like *least* goes:
>
>line = file.readline()
>while line:
>    process(line)
>    line = file.readline()
>file.close()

Just a quick note that if performance matters, do not actually call
another function to do the processing as process(line) shows. Do the
processing in-line. This can make a huge difference due to the
overhead of function calls. I know this from experience.

Any experts know why the overhead is so great in Python?

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