[Python-Dev] file and bytecode-only (original) (raw)

Barry Warsaw barry at python.org
Mon Mar 22 16:21:08 CET 2010

On Mar 16, 2010, at 07:44 PM, Nick Coghlan wrote:

In Python 3.1, invoking pycompile.compile() will create 2.x style bytecode. Similarly, when force==False, compileall.compiledir() and compileall.compilepath() will check for 2.x style bytecode in order to decide whether or not to compile the module.

The question for 3.2 is what bytecode layout pycompile.compile() should generate. For the precompile-a-system-library use case it should clearly generate a PEP 3147 layout and this probably makes sense as the default behaviour in 3.2. However, for production of bytecode-only packages, it would be convenient to be able to explicitly invoke the 2.x style behaviour without having to specify the target filename explicitly using the 'cfile' parameter (which isn't exposed at the compileall layer anyway).

My working branch modifies py_compile to produce PEP 3147 layout by default. I agree that it should support traditional pyc output as an option, and compileall should support this as well.

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