Add pyupgrade (in pre-commit and CI) (#33688)

* Add pyupgrade (in pre-commit and CI)

* Fix leftover results of pyupgrade

* Ensure we run for Python 3.7 on pyupgrade

.pre-commit-config.yaml

@@ -1,4 +1,9 @@
 repos:
+  - repo: https://github.com/asottile/pyupgrade
+    rev: v2.1.0
+    hooks:
+      - id: pyupgrade
+        args: [--py37-plus]
   - repo: https://github.com/psf/black
     rev: 19.10b0
     hooks:

azure-pipelines-ci.yml

@@ -68,6 +68,10 @@ stages:
         . venv/bin/activate
         pre-commit run yamllint --all-files
       displayName: 'Run yamllint'
+    - script: |
+        . venv/bin/activate
+        pre-commit run pyupgrade --all-files
+      displayName: 'Run pyupgrade'
   - job: 'Validate'
     pool:
       vmImage: 'ubuntu-latest'

docs/source/conf.py

@@ -1,5 +1,4 @@
 #!/usr/bin/env python3
-# -*- coding: utf-8 -*-
 #
 # Home-Assistant documentation build configuration file, created by
 # sphinx-quickstart on Sun Aug 28 13:13:10 2016.
@@ -26,7 +25,7 @@ from homeassistant.const import __short_version__, __version__
 PROJECT_NAME = 'Home Assistant'
 PROJECT_PACKAGE_NAME = 'homeassistant'
 PROJECT_AUTHOR = 'The Home Assistant Authors'
-PROJECT_COPYRIGHT = ' 2013-2020, {}'.format(PROJECT_AUTHOR)
+PROJECT_COPYRIGHT = f' 2013-2020, {PROJECT_AUTHOR}'
 PROJECT_LONG_DESCRIPTION = ('Home Assistant is an open-source '
                             'home automation platform running on Python 3. '
                             'Track and control all devices at home and '
@@ -37,7 +36,7 @@ PROJECT_GITHUB_REPOSITORY = 'home-assistant'
 
 GITHUB_PATH = '{}/{}'.format(
     PROJECT_GITHUB_USERNAME, PROJECT_GITHUB_REPOSITORY)
-GITHUB_URL = 'https://github.com/{}'.format(GITHUB_PATH)
+GITHUB_URL = f'https://github.com/{GITHUB_PATH}'
 
 
 sys.path.insert(0, os.path.abspath('_ext'))
@@ -132,7 +131,7 @@ def linkcode_resolve(domain, info):
 
     fn = fn[index:]
 
-    return '{}/blob/{}/{}{}'.format(GITHUB_URL, code_branch, fn, linespec)
+    return f'{GITHUB_URL}/blob/{code_branch}/{fn}{linespec}'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.

requirements_test_pre_commit.txt

@@ -7,4 +7,5 @@ flake8-docstrings==1.5.0
 flake8==3.7.9
 isort==4.3.21
 pydocstyle==5.0.2
+pyupgrade==2.1.0
 yamllint==1.21.0

script/hassfest/codeowners.py

@@ -62,7 +62,7 @@ def validate(integrations: Dict[str, Integration], config: Config):
     codeowners_path = config.root / "CODEOWNERS"
     config.cache["codeowners"] = content = generate_and_validate(integrations)
 
-    with open(str(codeowners_path), "r") as fp:
+    with open(str(codeowners_path)) as fp:
         if fp.read().strip() != content:
             config.add_error(
                 "codeowners",

script/hassfest/config_flow.py

@@ -68,7 +68,7 @@ def validate(integrations: Dict[str, Integration], config: Config):
     config_flow_path = config.root / "homeassistant/generated/config_flows.py"
     config.cache["config_flow"] = content = generate_and_validate(integrations)
 
-    with open(str(config_flow_path), "r") as fp:
+    with open(str(config_flow_path)) as fp:
         if fp.read().strip() != content:
             config.add_error(
                 "config_flow",

script/hassfest/model.py

@@ -17,7 +17,7 @@ class Error:
 
     def __str__(self) -> str:
         """Represent error as string."""
-        return "[{}] {}".format(self.plugin.upper(), self.error)
+        return f"[{self.plugin.upper()}] {self.error}"
 
 
 @attr.s

script/hassfest/ssdp.py

@@ -65,7 +65,7 @@ def validate(integrations: Dict[str, Integration], config: Config):
     ssdp_path = config.root / "homeassistant/generated/ssdp.py"
     config.cache["ssdp"] = content = generate_and_validate(integrations)
 
-    with open(str(ssdp_path), "r") as fp:
+    with open(str(ssdp_path)) as fp:
         if fp.read().strip() != content:
             config.add_error(
                 "ssdp",

script/hassfest/zeroconf.py

@@ -120,7 +120,7 @@ def validate(integrations: Dict[str, Integration], config: Config):
     zeroconf_path = config.root / "homeassistant/generated/zeroconf.py"
     config.cache["zeroconf"] = content = generate_and_validate(integrations)
 
-    with open(str(zeroconf_path), "r") as fp:
+    with open(str(zeroconf_path)) as fp:
         current = fp.read().strip()
         if current != content:
             config.add_error(