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Groups > comp.lang.python > #10349

Re: Only Bytecode, No .py Files

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Am 26.07.2011 23:20, schrieb Eldon Ziegler:
> That seemed like a good idea but the .py file was complied even though
> it was dated 2001-01-01 00:00:00. Python must be checking something
> beside the date.

The first four bytes of a pyc file contain the magic header. It must
match the magic of the current Python version. The next four bytes
contain the pyc_mtime. It must match the mtime of the corresponding .py
files as returned by fstat().st_mtime. If the magic doesn't match or the
mtime header doesn't match the mtime of the .py file, the pyc is ignored.

Hint: If you run python with the -v option, you can get information why
a pyc file is ignored.

$ touch test.py
$ pycompile test.py
$ python -v -c "import test"
...
# test.pyc matches test.py
import test # precompiled from test.pyc
...
$ touch test.py
$ python -v -c "import test"
...
# test.pyc has bad mtime
import test # from test.py
...

Christian

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Re: Only Bytecode, No .py Files Christian Heimes <lists@cheimes.de> - 2011-07-27 00:04 +0200
  Re: Only Bytecode, No .py Files harrismh777 <harrismh777@charter.net> - 2011-07-26 20:32 -0500
    Re: Only Bytecode, No .py Files Christian Heimes <lists@cheimes.de> - 2011-07-27 11:27 +0200
      Re: Only Bytecode, No .py Files harrismh777 <harrismh777@charter.net> - 2011-07-27 13:45 -0500

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