Update python

Changes:

- docker-library/python@3957597: Update to 3.9.0a2, pip 19.3.1
- docker-library/python@5f1e3cb: Update to 3.7.6, pip 19.3.1
- docker-library/python@4b59d07: Update to 3.6.10, pip 19.3.1
- docker-library/python@32b69d6: Update to 3.8.1, pip 19.3.1
- docker-library/python@d188118: Merge pull request docker-library/python#440 from infosiftr/enable-caveman-optimizations
- docker-library/python@43fe04f: Add "--enable-optimizations" on Python 2.7

Author: docker-library-bot

library/python

@@ -4,197 +4,197 @@ Maintainers: Tianon Gravi <[email protected]> (@tianon),
              Joseph Ferguson <[email protected]> (@yosifkit)
 GitRepo: https://github.com/docker-library/python.git
 
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 Architectures: amd64, arm32v5, arm32v7, arm64v8, i386, ppc64le, s390x
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 Constraints: windowsservercore-1809
 
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 Architectures: amd64, arm32v5, arm32v7, arm64v8, i386, ppc64le, s390x
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 Architectures: amd64, arm32v5, arm32v7, arm64v8, i386, ppc64le, s390x
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 Directory: 3.7/stretch
 
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 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
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 Constraints: windowsservercore-1809
 
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 Architectures: amd64, arm32v5, arm32v7, arm64v8, i386, ppc64le, s390x
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 Architectures: amd64, arm32v5, arm32v7, arm64v8, i386, ppc64le, s390x
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 Tags: 3.5.9-slim-buster, 3.5-slim-buster, 3.5.9-slim, 3.5-slim
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 Directory: 3.5/buster/slim
 
 Tags: 3.5.9-stretch, 3.5-stretch
 Architectures: amd64, arm32v5, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: 0b1fb9529c79ea85b8c80ff3dd85a32a935b0346
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 Architectures: amd64, arm32v5, arm32v7, arm64v8, i386, ppc64le, s390x
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 Directory: 3.5/stretch/slim
 
 Tags: 3.5.9-alpine3.10, 3.5-alpine3.10, 3.5.9-alpine, 3.5-alpine
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 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: 0b1fb9529c79ea85b8c80ff3dd85a32a935b0346
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 Directory: 3.5/alpine3.9
 
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 Architectures: amd64, arm32v5, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: 0b1fb9529c79ea85b8c80ff3dd85a32a935b0346
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 Directory: 2.7/buster
 
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 Directory: 2.7/alpine3.9
 
 Tags: 2.7.17-windowsservercore-ltsc2016, 2.7-windowsservercore-ltsc2016, 2-windowsservercore-ltsc2016