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bpo-39413: Implement os.unsetenv() on Windows#18163

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vstinner merged 3 commits intopython:masterpython/cpython:masterfrom

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Jan 24, 2020

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bpo-39413: Implement os.unsetenv() on Windows#18163
vstinner merged 3 commits intopython:masterfrom
vstinner:win_unsetenv4

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Commits on Jan 24, 2020

bpo-39413: Implement os.unsetenv() on Windows
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empty variable is invalid
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