Make KeyError from 'get_metadata' more flexible.

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* chore: Update gapic-generator-python to v1.8.5

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fix: Add service_yaml_parameters to py_gapic_library BUILD.bazel targets

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feat: add X.509 Name Constraints support

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feat: enable "rest" transport in Python for services supporting numeric enums

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* fix: Add `service_yaml` parameters to `privateca_py_gapic`

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* docs: Add three per company option to diversification levels

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…#339)

* fix(deps): require google-api-core>=1.32.0,>=2.8.0

* chore: update constraints

…versions (#339)

Expand pins on library dependencies in preparation for these dependencies taking a new major version. See #10566.

* docs: Minor formatting

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…ic enums (#339)

* feat: enable "rest" transport in Python for services supporting numeric enums

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* feat: enable "rest" transport in Python for services supporting numeric enums

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* update samples and system test to use REST

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* chore: Update gapic-generator-python to v1.8.2

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* chore: update Go import paths to match open source
chore: update gapic-generator-go version to 0.35.2

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* chore: regenerate API index

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* chore(python): drop python 3.6

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* require python 3.7+ in setup.py

* remove python 3.6 sample configs

* trigger ci

* add api_description to .repo-metadata.json

* update name_pretty in .repo-metadata.json

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* chore: update copyright year to 2022

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…#339)

* feat: add `FetchConnectedGa4Property` method to the Admin API v1alpha
feat: add `GetChannelGroup`, `ListChannelGroups`, `CreateChannelGroup`, `UpdateChannelGroup` methods to the Admin API v1alpha
feat: add `ChannelGroupFilter`, `ChannelGroupFilterExpression`, `ChannelGroupFilterExpressionList`, `GroupingRule`, `ChannelGroup` types to the Admin API v1alpha

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…p/templates/python_library/.kokoro (#339)

* build(deps): bump cryptography from 38.0.3 to 39.0.1 in /synthtool/gcp/templates/python_library/.kokoro

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* fix typo

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Bumps the year to 2020 in the templates. Also tweaked the formatting slightly (copied from go/copyright).

This resolves
https://togithub.com/googleapis/google-auth-library-python-oauthlib/issues/338.

Thank you for opening a Pull Request! Before submitting your PR, there are a few things you can do to make sure it goes smoothly:
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Fixes #<issue_number_goes_here> 🦕

* fix(deps): remove setuptools from dependencies

Fixes #338

* chore: remove setuptools from constraints

* chore(python): fix prerelease session [autoapprove]

Source-Link: googleapis/synthtool@1b9ad76
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* update replacement in owlbot.py

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…ied (#339)

Fixes #337

…_HOST (#433)

…_HOST

* keeps consistent naming across auth packages of all languages.

    The package will now check GCE_METADATA_HOST (the new name) first; if not present, it falls back to GCE_METADATA_ROOT (the old name), then the default value.

closes [#339](googleapis/google-auth-library-python#339).

🤖 I have created a release \*beep\* \*boop\* 
---
### [1.16.1](https://www.github.com/googleapis/google-auth-library-python/compare/v1.16.0...v1.16.1) (2020-06-04)


### Bug Fixes

* fix impersonated cred exception doc ([#521](https://www.github.com/googleapis/google-auth-library-python/issues/521)) ([9d5a9a9](https://www.github.com/googleapis/google-auth-library-python/commit/9d5a9a9884fecbd698a602d2a9fd9bec6b987de7))
* replace environment variable GCE_METADATA_ROOT with GCE_METADATA_HOST ([#433](https://www.github.com/googleapis/google-auth-library-python/issues/433)) ([8ffb4d3](https://www.github.com/googleapis/google-auth-library-python/commit/8ffb4d3e832607869026444e5a071c5f3e225fd2)), closes [#339](https://www.github.com/googleapis/google-auth-library-python/issues/339)
---


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