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由 Donald Stufft 提交于
* Move virtualenv creation out of TestPipEnvironment * Remove global state and force explicit use of TestPipEnvironment instances * Remove "backup" virtualenv copying and instead create new virtual environments each time. * Remove the monkeypatched "PyPICache" functionality * Remove things that were not being used anymore and were dead weight * Remove sitecustomize support which was primarily used to monkeypatch the "PyPICache" but was used in one or two other tests.
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