run_pdb() in test_pdb.py always returns stderr as None

[xdegaye]

BPO	25013
Nosy	@birkenfeld, @terryjreedy, @xdegaye
Files	run_pdb.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 = None
created_at = <Date 2015-09-06.10:36:43.877>
labels = ['tests', 'type-bug', 'library']
title = 'run_pdb() in test_pdb.py always returns stderr as None'
updated_at = <Date 2015-09-07.05:28:56.452>
user = 'https://github.com/xdegaye'

bugs.python.org fields:

activity = <Date 2015-09-07.05:28:56.452>
actor = 'terry.reedy'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)', 'Tests']
creation = <Date 2015-09-06.10:36:43.877>
creator = 'xdegaye'
dependencies = []
files = ['40379']
hgrepos = []
issue_num = 25013
keywords = ['patch']
message_count = 2.0
messages = ['249989', '250065']
nosy_count = 3.0
nosy_names = ['georg.brandl', 'terry.reedy', 'xdegaye']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue25013'
versions = ['Python 3.6']

Linked PRs

• gh-69201: Separate stdout and stderr stream in test_pdb #117308

[xdegaye]

The attached patch fixes this.

[terryjreedy]

Xavier, thanks for the idea. It seems sensible and I considered applying this, but since this is an internal pdb test design change rather than a pdb bug fix, and two other tests seem candidates for the same change, I am going to leave it to Gerog or someone else to review. I do not understand the details of run_pdb, the reason why some tests use it and other inline a subprocess call, or why they all mix together stdout and stderr.

[gaogaotiantian]

This is fixed in #117308.