os.popen with mode "rb" fails on Unix

[isonno]

BPO	703198
Nosy	@loewis, @gaul

^{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 2003-10-31.10:02:57.000>
created_at = <Date 2003-03-13.20:35:37.000>
labels = ['library']
title = 'os.popen with mode "rb" fails on Unix'
updated_at = <Date 2003-10-31.10:02:57.000>
user = 'https://bugs.python.org/isonno'

bugs.python.org fields:

activity = <Date 2003-10-31.10:02:57.000>
actor = 'loewis'
assignee = 'none'
closed = True
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2003-03-13.20:35:37.000>
creator = 'isonno'
dependencies = []
files = []
hgrepos = []
issue_num = 703198
keywords = []
message_count = 3.0
messages = ['15123', '15124', '15125']
nosy_count = 3.0
nosy_names = ['loewis', 'gaul', 'isonno']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue703198'
versions = []

[isonno]

On Windows, it's necessary to use the mode "rb" to
open a binary stream to a process. On Unix the "b"
modifier isn't necessary, but supplying it causes the
popen call to fail with

OSError: [Errno 22] Invalid argument

The Unix version of popen should accept and simply
ignore the "b" modifier to the mode, rather than fail.
That way the same code can run on both platforms
without modification or extra code to special case an
OS that may need the "b" modifier.

[gaul]

Logged In: YES
user_id=139865

See patch 788404 for a fix.

[loewis]

Logged In: YES
user_id=21627

Fixed with said patch.