Regression for executing packages

[vajda]

BPO	4195
Nosy	@ncoghlan, @benjaminp
Files	patch.2751.diff: patch to runpy.py issue4195_runpy_package_support.diff: Updated patch with test cases and doc updates

^{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/ncoghlan'
closed_at = <Date 2009-02-08.01:59:36.058>
created_at = <Date 2008-10-24.18:44:58.858>
labels = ['interpreter-core', 'type-bug']
title = 'Regression for executing packages'
updated_at = <Date 2009-02-08.01:59:36.056>
user = 'https://bugs.python.org/vajda'

bugs.python.org fields:

activity = <Date 2009-02-08.01:59:36.056>
actor = 'ncoghlan'
assignee = 'ncoghlan'
closed = True
closed_date = <Date 2009-02-08.01:59:36.058>
closer = 'ncoghlan'
components = ['Interpreter Core']
creation = <Date 2008-10-24.18:44:58.858>
creator = 'vajda'
dependencies = []
files = ['11876', '11885']
hgrepos = []
issue_num = 4195
keywords = ['patch']
message_count = 4.0
messages = ['75175', '75203', '76560', '81362']
nosy_count = 3.0
nosy_names = ['ncoghlan', 'benjamin.peterson', 'vajda']
pr_nums = []
priority = 'normal'
resolution = 'accepted'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue4195'
versions = ['Python 3.1', 'Python 2.7']

[vajda]

Copy of bpo-2751.

Having discussed this with Nick a bit more over email, he suggested that
package execution could actually be properly supported by looking for a
__main__ module inside the package and executing it instead. This is
consistent with the way .zip archives are executed and would neatly
resolve this problem. I attached a simple patch implementing this.

Nick also said that fixing this might be considered a new feature and
might have to wait until 2.7. Given that this worked on Python 2.5,
albeit unintentionally, I'd argue that this is closer to a fix of a
somewhat buggy Python 2.5 feature than a new feature in 2.6.

[ncoghlan]

Added revised version of patch with test cases and documentation
updates, as well as fixing a potential recursion issue with pathological
packages where __main__ was also a package)

[ncoghlan]

Missed the window for 2.6/3.0. Guido agreed on python-dev that it counts
as a new feature, so it was definitely out for the already-released 2.6,
and also wasn't really an option for the release candidate phase of 3.0.

Assigning to myself for 2.7/3.1 - I'll put it in once the 3.0
maintenance branch has been cut (so I can update both 2.x and 3.x at the
same time.

For 2.6 and 3.0 though, short run scripts such as "python -m jcc.main"
are going to be the order of the day.

[ncoghlan]

Incorporated as:
2.7: r69419
3.1: r69421