Clear C code under PyImport_ExecCodeModuleObject()

[brettcannon]

BPO	15169
Nosy	@loewis, @brettcannon

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/brettcannon'
closed_at = <Date 2012-07-13.17:58:30.622>
created_at = <Date 2012-06-24.19:59:15.595>
labels = ['interpreter-core', 'release-blocker']
title = 'Clear C code under PyImport_ExecCodeModuleObject()'
updated_at = <Date 2012-07-13.17:58:30.621>
user = 'https://github.com/brettcannon'

bugs.python.org fields:

activity = <Date 2012-07-13.17:58:30.621>
actor = 'brett.cannon'
assignee = 'brett.cannon'
closed = True
closed_date = <Date 2012-07-13.17:58:30.622>
closer = 'brett.cannon'
components = ['Interpreter Core']
creation = <Date 2012-06-24.19:59:15.595>
creator = 'brett.cannon'
dependencies = []
files = []
hgrepos = []
issue_num = 15169
keywords = []
message_count = 4.0
messages = ['163834', '163836', '164019', '165393']
nosy_count = 3.0
nosy_names = ['loewis', 'brett.cannon', 'python-dev']
pr_nums = []
priority = 'release blocker'
resolution = 'fixed'
stage = 'needs patch'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue15169'
versions = ['Python 3.3']

[brettcannon]

import.c:PyImport_ExecCodeModuleObject() is holding on to a ton of C code thanks to get_sourcefile(). Should have PyImport_ExecCodeModuleWithPathnames() use get_sourcefile() only. And then get_sourcefile() should get re-implemented in Python code.

[loewis]

I propose to defer this to 3.4.

[brettcannon]

The problem of deferring to 3.4 is that it will lock in semantics which are honestly weird and not desirable for PyImport_ExecCodeModuleObject() which is new in 3.3.

[python-dev]

New changeset 9e164b404983 by Brett Cannon in branch 'default':
Issues bpo-15169, bpo-14599: Make PyImport_ExecCodeModuleWithPathnames() use
http://hg.python.org/cpython/rev/9e164b404983