doctest doesn't support packages

[vstinner]

BPO	26641
Nosy	@brettcannon, @ncoghlan, @vstinner, @ericsnowcurrently
Files	doctest_package.patch

^{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 = None
closed_at = <Date 2016-03-29.23:31:02.358>
created_at = <Date 2016-03-25.12:00:35.810>
labels = ['type-feature', 'library']
title = "doctest doesn't support packages"
updated_at = <Date 2016-03-29.23:31:02.357>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2016-03-29.23:31:02.357>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2016-03-29.23:31:02.358>
closer = 'vstinner'
components = ['Library (Lib)']
creation = <Date 2016-03-25.12:00:35.810>
creator = 'vstinner'
dependencies = []
files = ['42288']
hgrepos = []
issue_num = 26641
keywords = ['patch']
message_count = 3.0
messages = ['262429', '262637', '262638']
nosy_count = 5.0
nosy_names = ['brett.cannon', 'ncoghlan', 'vstinner', 'python-dev', 'eric.snow']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue26641'
versions = ['Python 3.6']

[vstinner]

The PEP-420 -- Implicit Namespace Packages introduces packages which have no __init__.py file and can be made of multiple packages. It looks like doctest doesn't support them.

I would like to convert the Lib/test/ of the Python standard library into such package for the issue bpo-26295.

I propose to use an heuristic when the package is only made of one directory (when module.__path__ only contains one entry): use this directory to lookup for requested test files.

Attached patch implements that.

[python-dev]

New changeset 32539353eb95 by Victor Stinner in branch 'default':
doctest now supports packages
https://hg.python.org/cpython/rev/32539353eb95

[vstinner]

I pushed a different fix using module.__path__ since my use case is the test module splitted into at least two directories.