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Diffstat (limited to 'Doc/using/cmdline.rst')
| -rw-r--r-- | Doc/using/cmdline.rst | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/Doc/using/cmdline.rst b/Doc/using/cmdline.rst index e6189fd812..d110ae3baf 100644 --- a/Doc/using/cmdline.rst +++ b/Doc/using/cmdline.rst @@ -411,7 +411,7 @@ Miscellaneous options nested imports). Note that its output may be broken in multi-threaded application. Typical usage is ``python3 -X importtime -c 'import asyncio'``. See also :envvar:`PYTHONPROFILEIMPORTTIME`. - * ``-X dev``: enable CPython's "developer mode", introducing additional + * ``-X dev``: enable CPython's "development mode", introducing additional runtime checks which are too expensive to be enabled by default. It should not be more verbose than the default if the code is correct: new warnings are only emitted when an issue is detected. Effect of the developer mode: @@ -426,6 +426,8 @@ Miscellaneous options * Enable the :mod:`faulthandler` module to dump the Python traceback on a crash. * Enable :ref:`asyncio debug mode <asyncio-debug-mode>`. + * Set the :attr:`~sys.flags.dev_mode` attribute of :attr:`sys.flags` to + ``True`` It also allows passing arbitrary values and retrieving them through the :data:`sys._xoptions` dictionary. @@ -796,6 +798,14 @@ conflict. .. versionadded:: 3.7 See :pep:`538` for more details. + +.. envvar:: PYTHONDEVMODE + + If this environment variable is set to a non-empty string, enable the + CPython "development mode". See the :option:`-X` ``dev`` option. + + .. versionadded:: 3.7 + Debug-mode variables ~~~~~~~~~~~~~~~~~~~~ |