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.. Licensed to the Apache Software Foundation (ASF) under one
.. or more contributor license agreements. See the NOTICE file
.. distributed with this work for additional information
.. regarding copyright ownership. The ASF licenses this file
.. to you under the Apache License, Version 2.0 (the
.. "License"); you may not use this file except in compliance
.. with the License. You may obtain a copy of the License at
.. http://www.apache.org/licenses/LICENSE-2.0
.. Unless required by applicable law or agreed to in writing,
.. software distributed under the License is distributed on an
.. "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
.. KIND, either express or implied. See the License for the
.. specific language governing permissions and limitations
.. under the License.
.. currentmodule:: pyarrow
=====================
Environment Variables
=====================
The following environment variables can be used to affect the behavior of
PyArrow.
.. envvar:: ARROW_HOME
The base path to the PyArrow installation. This variable overrides the
default computation of library paths in introspection functions such
as :func:`get_library_dirs`.
.. envvar:: ARROW_PRE_0_15_IPC_FORMAT
If this environment variable is set to a non-zero integer value, the PyArrow
IPC writer will default to the pre-0.15 Arrow IPC format.
This behavior can also be enabled using :attr:`IpcWriteOptions.use_legacy_format`.
.. envvar:: ARROW_PRE_1_0_METADATA_VERSION
If this environment variable is set to a non-zero integer value, the PyArrow
IPC writer will write V4 Arrow metadata (corresponding to pre-1.0 Arrow
with an incompatible Union data layout).
This behavior can also be enabled using :attr:`IpcWriteOptions.metadata_version`.
.. envvar:: PKG_CONFIG
The path to the ``pkg-config`` executable. This may be required for
proper functioning of introspection functions such as
:func:`get_library_dirs` if ``pkg-config`` is not available on the system
``PATH``.
.. note::
Since PyArrow is based on Arrow C++, its behavior is also affected by
the :ref:`Arrow C++ environment variables <cpp_env_vars>`.
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