* Update flake8 settings

* Add poetry to isort namespace packages

* Ignore flake8 E501 for long test names

* Run automatic string formatting on tests

* Run automatic string formatting on src

* Fix typo "already exits"

* Ignore long URLs, hashes, and paths

* Fix in-line comments

* Fix in-line comments in tests

* Fix docstrings

* Ignore misc

* Fix f-strings in src

* Fix f-strings in tests

* Fix multi-line strings in src

* Fix multi-line strings in tests

* Fix some oddly autoformatted code

* Replace some strings by multi-line strings

* Revert namespace change

* Add black string processing to pre-commit

* Move black pre-commit config to pyproject.toml

* Autoformat install scripts

* Manual line wrapping for install scripts

* Disable black formatting for expected strings

* Replace strings by constant

* Ideas for refactoring

And also refering to issue #4961

* Respond to the review

Removed items() from os.environ and add blank lines

* Add link.is_wheel back

updates:
- [github.com/psf/black: 21.11b1 → 21.12b0](https://github.com/psf/black/compare/21.11b1...21.12b0)
- [github.com/pre-commit/pre-commit: v2.15.0 → v2.16.0](https://github.com/pre-commit/pre-commit/compare/v2.15.0...v2.16.0)

updates:
- [github.com/pre-commit/pre-commit: v2.13.0 → v2.15.0](https://github.com/pre-commit/pre-commit/compare/v2.13.0...v2.15.0)

* add pre-commit hooks for check & lock
* add pre-commit hook for export requirements.txt
* add pre-commit hooks to docs
* add pre-commit hook to check pre-commit-hooks.yaml file

Thanks @graingert and @asottile for pointing out the `files` constraint.
See discussion on #2511.

Co-authored-by: Thomas Grainger <tagrain@gmail.com>
Co-authored-by: Bjorn Neergaard <bjorn@neersighted.com>

* use new installer in README and website
* use double quotes for `pyproject.toml` example
* small improvement for installer note
* doc: use `python3` for invoking Python

Due to the wording in [1] the broader python tooling ecosystem
sometimes expects an exact match to the single line pkgutil extend_path
usage. This change replaces current pkgutil style namespace package
implementation with the one line implementation described in [1].

This change also causes an import order change as `poetry.core` is
correctly detected as a third-party package.

[1] https://packaging.python.org/guides/packaging-namespace-packages/#pkgutil-style-namespace-packages

* add typehints to tests.publishing

* add typehints to tests.puzzle

* add typehints to tests.repositories

* add typehints to tests.utils.test_authenticator, tests.utils.test_env, tests.utils.test_env_site, tests.utils.test_exporter

* add typehints to tests.utils.test_extras, tests.utils.test_helpers, tests.utils.test_password_manager, tests.utils.test_patterns, tests.utils.test_pip, tests.utils.setup_reader

* add typehints to tests.test_factory

* add typehints to tests.helpers

* add remaining missing typehints to tests.conftest

* add flake8-annotations to flake8 pre-commit hook

* create a FixtureDirGetter protocol type

* add comments to .flake8 settings and fix missing typehints after rebase

updates:
- [github.com/asottile/pyupgrade: v2.29.0 → v2.29.1](https://github.com/asottile/pyupgrade/compare/v2.29.0...v2.29.1)
- [github.com/psf/black: 21.10b0 → 21.11b1](https://github.com/psf/black/compare/21.10b0...21.11b1)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

* Fix SIM102: Use a single if-statement instead of nested if-statements

* Fix SIM105: Use 'contextlib.suppress(...)' instead of try-except-pass

* Fix SIM110: Use 'return any(...)'

* Fix SIM113: Use enumerate instead of manually incrementing a counter

* Fix SIM114: Combine conditions via a logical or to prevent duplicating code

* Fix SIM211: Use 'not a' instead of 'False if a else True'

* Fix SIM300: Use 'age == 42' instead of '42 == age' (Yoda-conditions)

* Fix SIM119: Use dataclasses for data containers

* Ignore "SIM106: Handle error-cases first" for now

* add typehints to tests.inspection

* change several yield statements in fixtures to return

* add typehints to tests.installation.test_chef, tests.installation.test_chooser, tests.installation.test_executor

* add typehints to tests.installation.test_installer

* add typehints to tests.installation.test_installer_old

* add typehints to tests.installation.test_pip_installer

* add typehints to tests.masonry

* add typehints to tests.mixology

* add typehints to tests.packages

* add typehints to tests.plugins

Resolves #4688

* add missing type hints to application code

* add typehints to tests.config, tests.console.commands.debug, tests.console.commands.env

* add typehints to tests.console.commands.plugin

* add typehints to tests.self

* add typehints to tests.console.commands.source

* add typehints to tests.console.commands.about

* add typehints tests.console.commands.add

* add typehints to tests.console.commands.test_cache

* add typehints to tests.console.commands.test_check

* add typehints to tests.console.commands.test_config

* add typehints to tests.console.commands.test_export

* add typehints to tests.console.commands.test_init

* add typehints to tests.console.commands.test_install

* add typehints to tests.console.commands.test_lock

* add typehints to tests.console.commands.test_new

* add typehints to tests.console.commands.test_publish

* add typehints to tests.console.commands.test_remove

* add typehints to tests.console.commands.test_run

* add typehints to tests.console.commands.test_search

* add typehints to tests.console.commands.test_show

* add typehints to tests.console.commands.test_version

* add typehints to tests.console.test_application

* add typehints to tests.console.conftest

* add typehints to tests.console.conftest

* add python version constraint for typing-extension

* fix type hint for http fixture

* Use flake8-type-checking

* Fixes for flake8-type-checking violations

* Set enable-extensions before ignores and excludes

* Remove noqa duplicate

* Use new flake8-type-checking version with type-checking-exempt-modules feature for imports of typing and typing-extensions so that noqa comments are not required anymore

* Ignore TC002 in __init__ files

* Remove noqa from pyi files because they are not checked anyway

Implements the reviews from #3987 and #3988. Special thanks to the
committers and reviewers there.

Co-authored-by: Harry Peach <harrypeach1999@gmail.com>
Co-authored-by: Kamyar Ghasemlou <kamyar@kamy.me>
Co-authored-by: Leonardo Freua <leonardo.batista.freua@gmail.com>

https://github.com/python-poetry/poetry-core/pull/245

In order to ensure coverage discovery and prevent flaky tooling.