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Commit1b2d3f0

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__init__: don't run refresh on import
Consumers of gitpython may not need to use it in all use cases, and maywant to be able to run (without using gitpython) in environments wheregit is not available on PATH. While this can be worked around by settingthe GIT_PYTHON_REFRESH environment variable, adding special handling forgitpython means that it can't be imported just like everything else inan import block at the top of the module, and environment variables havepotentially undesired propagation behaviour.Previously, it was also nontrivial to distinguish gitpython failing toimport because of missing git or because e.g. gitpython isn't installedat all, because the exception that's raised is an ImportError withoutfurther qualification (except in the error message).Thus, we now no longer perform `refresh` at the module top level.
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‎doc/source/changes.rst‎

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Changelog
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=========
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4.0.0
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=====
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GitPython will no longer throw an ImportError when no git executable can
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be found at import time. Instead, errors are deferred until the first
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attempt at using it. Consumers with special handling for
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the old ImportError behaviour should instead call `git.refresh` and handle
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GitCommandNotFoundErrors themselves.
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See the following for all changes.
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https://github.com/gitpython-developers/GitPython/releases/tag/4.0.0
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3.1.45
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======
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‎git/__init__.py‎

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GIT_OK=True
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try:
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refresh()
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exceptExceptionas_exc:
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raiseImportError("Failed to initialize: {0}".format(_exc))from_exc
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# } END initialize git executable path

‎test/__init__.py‎

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#
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# This module is part of GitPython and is released under the
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# 3-Clause BSD License: https://opensource.org/license/bsd-3-clause/
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#
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importgit
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git.refresh()

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