10000 bpo-38791: Add readline history environment variable by jonathan-conder · Pull Request #17149 · python/cpython · GitHub
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bpo-38791: Add readline history environment variable #17149

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bpo-38791: Add readline history environment variable
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@jonathan-conder
jonathan-conder committed Nov 14, 2019
commit 536ae80434daba2a9a294e7b82b7aadf9a9038f3
8 changes: 4 additions & 4 deletions Doc/library/site.rst
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Expand Up @@ -145,10 +145,10 @@ On systems that support :mod:`readline`, this module will also import and
configure the :mod:`rlcompleter` module, if Python is started in
:ref:`interactive mode <tut-interactive>` and without the :option:`-S` option.
The default behavior is enable tab-completion and to use
:file:`~/.python_history` as the history save file. To disable it, delete (or
override) the :data:`sys.__interactivehook__` attribute in your
:mod:`sitecustomize` or :mod:`usercustomize` module or your
:envvar:`PYTHONSTARTUP` file.
:envvar:`PYTHONHISTFILE` (or :file:`~/.python_history`, if the former does not
exist) as the history save file. To disable it, delete (or override) the
:data:`sys.__interactivehook__` attribute in your :mod:`sitecustomize` or
:mod:`usercustomize` module or your :envvar:`PYTHONSTARTUP` file.

.. versionchanged:: 3.4
Activation of rlcompleter and history was made automatic.
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6 changes: 6 additions & 0 deletions Doc/using/cmdline.rst
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Expand Up @@ -515,6 +515,12 @@ before the command-line switches other than -E or -I. It is customary that
command-line switches override environmental variables where there is a
conflict.

.. envvar:: PYTHONHISTFILE

If this is the name of a file, and :mod:`readline` is enabled, it will be
used as the history save file. The default is :file:`~/.python_history`.


.. envvar:: PYTHONHOME

Change the location of the standard Python libraries. By default, the
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7 changes: 5 additions & 2 deletions Lib/site.py
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Expand Up @@ -434,8 +434,11 @@ def register_readline():
# each interpreter exit when readline was already configured
# through a PYTHONSTARTUP hook, see:
# http://bugs.python.org/issue5845#msg198636
history = os.path.join(os.path.expanduser('~'),
'.python_history')
history = os.environ.get('PYTHONHISTFILE')
if not history or not os.path.isfile(history):
history = os.path.join(os.path.expanduser('~'),
'.python_history')

try:
readline.read_history_file(history)
except OSError:
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0