[issue37755] pydoc topics, keywords and symbols always use pager instead of output

[Enrico Tröger]

Change by Enrico Tröger :


--
keywords: +patch
pull_requests: +14847
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/15105

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[issue37755] pydoc topics, keywords and symbols always use pager instead of output

[Enrico Tröger]

New submission from Enrico Tröger :

I noticed a probably unintended behavior in help() usage:

when an output is set on pydoc.Helper(), most of its methods
use this output instead of a pager.
But 'True', 'False' and 'None' as well as all topics, keywords
and symbols always use a pager instead of the configured output.

My use case is to use the pydoc help system to display help contents
in Geany (a text editor) in a graphical manner
(and so I cannot make any use of a pager).

Example code:

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

from io import StringIO
import pydoc
import sys


if __name__ == '__main__':
help_text = StringIO()

helper = pydoc.Helper(output=help_text)
# help contents are written to help_text as expected
helper.help('pydoc')

# the following calls each show the help contents in a pager instead
# of using the configured output
helper.help('True')
helper.help('False')
helper.help('None')
helper.help('**')  # symbol example
helper.help('SEQUENCES')  # topic example
helper.help('await')  # keyword example


Tested against Python 3.7.3.

--
components: Library (Lib)
messages: 348983
nosy: eht16
priority: normal
severity: normal
status: open
title: pydoc topics, keywords and symbols always use pager instead of output
type: behavior
versions: Python 3.8

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