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Advanced topics
===============
.. _guide_environment-settings:
Environment settings
--------------------
Options in the :py:attr:`pyglet.options` dictionary can have defaults set
through the operating system's environment variable. The following table
shows which environment variable is used for each option:
.. list-table::
:header-rows: 1
* - Environment variable
- :py:attr:`pyglet.options` key
- Type
- Default value
* - ``PYGLET_AUDIO``
- ``audio``
- List of strings
- ``directsound,openal,alsa,silent``
* - ``PYGLET_DEBUG_GL``
- ``debug_gl``
- Boolean
- ``1`` [#debug_gl]_
.. [#debug_gl] Defaults to ``1`` unless Python is run with ``-O`` or from a
frozen executable.
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