Does python always need to compile ENTIRE program before it c an start to run it???
lance.ellinghaus at eds.com
Tue Nov 4 00:34:33 CET 2003
If I remember correctly, Yes.
Python will import each module, compile if necessary, and then execute it.
This might cause additional modules to be compiled, loaded, etc.. But Python
will not import a module more than one time. Each additional time the import
is called for the same module, Python just binds a new reference into the
EDS - TWAI Operations
From: seberino at spawar.navy.mil [mailto:seberino at spawar.navy.mil]
Sent: Monday, November 03, 2003 3:28 PM
To: Ellinghaus, Lance
Cc: python-list at python.org
Subject: Re: Does python always need to compile ENTIRE program before it c
an start to run it???
Thanks for the info. I agree that the initial script you
run must be compiled completely before it can execute.
Does "completely" = all the imported modules too?
> When Python loads a module (.py file) from an 'import' statement, it
> will see if there is an already compiled version in the same directory
> and named the same except for the '.pyc' or '.pyo' extension. If it
> finds this file AND it is newer than the corresponding source code
> (.py) then it will load the saved compilation and then run it. If the
> file is not found or it is older than the source, then Python will
> compile the source, attempt to save the compiled version, and then it
> will execute it.
The first word of your comments above is "When". So if Python doesn't load
a module until 3 hours into the execution of a large Python program then
your recipe above (including compilation of module) won't get run until 3
hours AFTER execution starts right?
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