UsdPythonWrite
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Introduction
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UsdPythonWrite nodes allow users to run Python code to build a USD layer directly in the node graph.
The edit layer is accessed through a local variable named ``layer``.

.. note:: By default, the UsdPythonWrite node type is disabled. You can set the
    ``KATANA_ENABLE_USDPYTHONWRITE_NODE`` environment variable to ``1`` before
    launching Katana to make it available.