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Backport upstream commit 9e0b427893b65b220faf8a31a6afdc67f6f41364 “Use != with literals”
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diff -Naur grpc-1.26.0-original/src/python/grpcio/commands.py grpc-1.26.0/src/python/grpcio/commands.py
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--- grpc-1.26.0-original/src/python/grpcio/commands.py	2019-12-17 20:29:27.000000000 -0500
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+++ grpc-1.26.0/src/python/grpcio/commands.py	2021-01-28 12:51:33.635142522 -0500
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@@ -99,7 +99,7 @@
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         target_dir = os.path.join(GRPC_STEM, 'doc', 'build')
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         exit_code = sphinx.cmd.build.build_main(
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             ['-b', 'html', '-W', '--keep-going', source_dir, target_dir])
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-        if exit_code is not 0:
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+        if exit_code:
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             raise CommandError(
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                 "Documentation generation has warnings or errors")
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