* changes without context

        autosynth cannot find the source of changes triggered by earlier changes in this
        repository, or by version upgrades to tools such as linters.

* chore: add missing quotation mark

Source-Author: Bu Sun Kim <8822365+busunkim96@users.noreply.github.com>
Source-Date: Mon Jan 11 09:43:06 2021 -0700
Source-Repo: googleapis/synthtool
Source-Sha: 16ec872dd898d7de6e1822badfac32484b5d9031
Source-Link: googleapis/synthtool@16ec872

* build(python): make `NOX_SESSION` optional

I added this accidentally in #889. `NOX_SESSION` should be passed down if it is set but not marked required.

Source-Author: Bu Sun Kim <8822365+busunkim96@users.noreply.github.com>
Source-Date: Tue Jan 19 09:38:04 2021 -0700
Source-Repo: googleapis/synthtool
Source-Sha: ba960d730416fe05c50547e975ce79fcee52c671
Source-Link: googleapis/synthtool@ba960d7

* chore: Add header checker config to python library synth

Now that we have it working in [python-docs-samples](https://github.com/GoogleCloudPlatform/python-docs-samples/blob/master/.github/header-checker-lint.yml) we should consider adding it to the 🐍 libraries :)

Source-Author: Leah E. Cole <6719667+leahecole@users.noreply.github.com>
Source-Date: Mon Jan 25 13:24:08 2021 -0800
Source-Repo: googleapis/synthtool
Source-Sha: 573f7655311b553a937f9123bee17bf78497db95
Source-Link: googleapis/synthtool@573f765

* chore: add noxfile parameters for extra dependencies

Also, add tests for some noxfile parameters for assurance that the
template generates valid Python.

Co-authored-by: Jeffrey Rennie <rennie@google.com>

Source-Author: Tim Swast <swast@google.com>
Source-Date: Tue Jan 26 12:26:57 2021 -0600
Source-Repo: googleapis/synthtool
Source-Sha: 778d8beae28d6d87eb01fdc839a4b4d966ed2ebe
Source-Link: googleapis/synthtool@778d8be

* build: migrate to flakybot

Source-Author: Justin Beckwith <justin.beckwith@gmail.com>
Source-Date: Thu Jan 28 22:22:38 2021 -0800
Source-Repo: googleapis/synthtool
Source-Sha: d1bb9173100f62c0cfc8f3138b62241e7f47ca6a
Source-Link: googleapis/synthtool@d1bb917

A py.typed file must be included in the released package for it to be considered typed by type checkers. https://www.python.org/dev/peps/pep-0561/#packaging-type-information. See googleapis/python-secret-manager#79

Source-Author: Bu Sun Kim <8822365+busunkim96@users.noreply.github.com>
Source-Date: Fri Feb 5 17:32:06 2021 -0700
Source-Repo: googleapis/synthtool
Source-Sha: 33366574ffb9e11737b3547eb6f020ecae0536e8
Source-Link: googleapis/synthtool@3336657

* docs: update python contributing guide

Adds details about blacken, updates version for system tests,
and shows how to pass through pytest arguments.

Source-Author: Chris Cotter <cjcotter@google.com>
Source-Date: Mon Feb 8 17:13:36 2021 -0500
Source-Repo: googleapis/synthtool
Source-Sha: 4679e7e415221f03ff2a71e3ffad75b9ec41d87e
Source-Link: googleapis/synthtool@4679e7e

* build(python): enable flakybot on library unit and system tests

Source-Author: Bu Sun Kim <8822365+busunkim96@users.noreply.github.com>
Source-Date: Wed Feb 17 14:10:46 2021 -0700
Source-Repo: googleapis/synthtool
Source-Sha: d17674372e27fb8f23013935e794aa37502071aa
Source-Link: googleapis/synthtool@d176743

* test: install pyopenssl for mtls testing

Source-Author: arithmetic1728 <58957152+arithmetic1728@users.noreply.github.com>
Source-Date: Tue Mar 2 12:27:56 2021 -0800
Source-Repo: googleapis/synthtool
Source-Sha: 0780323da96d5a53925fe0547757181fe76e8f1e
Source-Link: googleapis/synthtool@0780323

* chore: add pre-commit-config to renovate ignore paths

Disable renovate PRs on the .pre-commit-config.yaml which is templated from synthtool. https://docs.renovatebot.com/configuration-options/#ignorepaths

Source-Author: Bu Sun Kim <8822365+busunkim96@users.noreply.github.com>
Source-Date: Mon Mar 15 09:05:39 2021 -0600
Source-Repo: googleapis/synthtool
Source-Sha: 2c54c473779ea731128cea61a3a6c975a08a5378
Source-Link: googleapis/synthtool@2c54c47

* build(python): fail nox sessions if a python version is missing

Nox's default behavior is to quietly skip if a python interpreter is missing. https://nox.thea.codes/en/stable/usage.html#failing-sessions-when-the-interpreter-is-missing

Source-Author: Bu Sun Kim <8822365+busunkim96@users.noreply.github.com>
Source-Date: Tue Mar 16 13:38:02 2021 -0600
Source-Repo: googleapis/synthtool
Source-Sha: eda422b90c3dde4a872a13e6b78a8f802c40d0db
Source-Link: googleapis/synthtool@eda422b

* chore(python): add kokoro configs for periodic builds against head

This change should be non-destructive.

Note for library repo maintainers:
After applying this change, you can easily add (or change) periodic
builds against head by adding config files in google3.

See python-pubsub repo for example.

Source-Author: Takashi Matsuo <tmatsuo@google.com>
Source-Date: Fri Mar 19 11:17:59 2021 -0700
Source-Repo: googleapis/synthtool
Source-Sha: 79c8dd7ee768292f933012d3a69a5b4676404cda
Source-Link: googleapis/synthtool@79c8dd7

* Update .repo-metadata.json

* Update .repo-metadata.json to include dev-play team as codeowners

* Update the CODEOWNERS file manually to add the DevPlat team

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>