replace pyright by mypy

.github/workflows/code-formatting.yml

@@ -22,88 +22,55 @@ jobs:
       - name: Run isort
         run: isort --settings-path=./pyproject.toml --check-only --diff .
 
-  code-black:
-    name: Check code formatting with Black
-    runs-on: ubuntu-20.04
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v2
-      - name: Set up Python 3.8
-        uses: actions/setup-python@v2
-        with:
-          python-version: 3.8
-      - name: Install Black
-        run: pip install black==19.10b0
-      - name: Run Black
-        run: echo "LGTM"
-        # run black --skip-string-normalization --config=pyproject.toml --check . # TODO, uncomment
+  #code-black:
+  #  name: Check code formatting with Black
+  #  runs-on: ubuntu-20.04
+  #  steps:
+  #    - name: Checkout
+  #      uses: actions/checkout@v2
+  #    - name: Set up Python 3.8
+  #      uses: actions/setup-python@v2
+  #      with:
+  #        python-version: 3.8
+  #    - name: Install Black
+  #      run: pip install black==19.10b0
+  #    - name: Run Black
+  #      run: echo "LGTM"
+  #      run black --skip-string-normalization --config=pyproject.toml --check . # TODO, uncomment
 
-  python-types:
-    name: Python static type checking with Pyright
+  python-pep8:
+    name: Python formatting PEP8
     runs-on: ubuntu-20.04
 
     # Timeout: https://stackoverflow.com/a/59076067/4521646
-    timeout-minutes: 15
+    timeout-minutes: 10
     steps:
       - name: Checkout
         uses: actions/checkout@v2
       - uses: actions/setup-python@v2
         with:
           python-version: 3.7
 
-      # Note: This uses an internal pip API and may not always work
-      # https://github.com/actions/cache/blob/master/examples.md#multiple-oss-in-a-workflow
-      - name: Cache pip
-        uses: actions/cache@v2
-        with:
-          path: ~/.cache/pip
-          key: ${{ runner.os }}-pip-extras-${{ hashFiles('requirements.txt') }}-${{ hashFiles('requirements/extra.txt') }}
-          restore-keys: |
-            ${{ runner.os }}-pip-extras-
-
       - name: Install dependencies
-        env:
-          HOROVOD_BUILD_ARCH_FLAGS: "-mfma"
-          HOROVOD_WITHOUT_MXNET: 1
-          HOROVOD_WITHOUT_TENSORFLOW: 1
         run: |
-          # python -m pip install --upgrade --user pip
-          pip install --requirement requirements.txt --upgrade-strategy only-if-needed --find-links https://download.pytorch.org/whl/cpu/torch_stable.html --quiet
-          pip install --requirement ./requirements/devel.txt --quiet
-          # pip install tox coverage
-          python --version ; pip --version ; pip list
-        shell: bash
-
-      - name: Set up node
-        uses: actions/setup-node@v1
-        with:
-          node-version: '12'
-
-      - name: Install pyright
-        run: |
-          npm install pyright
+          pip install flake8
 
-      - name: Run type checking
+      - name: Run checking
         run: |
-          $(npm bin)/pyright --project .pyrightconfig.json
+          flake8 .
 
-  python-pep8:
-    name: Python formatting PEP8
+  python-typing-mypy:
+    name: Python typing check [mypy]
     runs-on: ubuntu-20.04
-
-    # Timeout: https://stackoverflow.com/a/59076067/4521646
-    timeout-minutes: 10
     steps:
-      - name: Checkout
-        uses: actions/checkout@v2
+      - uses: actions/checkout@master
       - uses: actions/setup-python@v2
         with:
-          python-version: 3.7
-
-      - name: Install dependencies
+          python-version: 3.8
+      - name: Install mypy
         run: |
-          pip install flake8
-
-      - name: Run checking
+          pip install mypy
+          pip list
+      - name: mypy check
         run: |
-          flake8 .
+          mypy

.pre-commit-config.yaml

@@ -30,3 +30,7 @@ repos:
         args: [--settings-path, ./pyproject.toml]
         language: system
         types: [python]
+
+  - repo: https://github.com/pre-commit/mirrors-mypy
+    hooks:
+      - id: mypy

pytorch_lightning/__init__.py

@@ -47,9 +47,9 @@
     # This variable is injected in the __builtins__ by the build
     # process. It used to enable importing subpackages of skimage when
     # the binaries are not built
-    __LIGHTNING_SETUP__
+    _ = None if __LIGHTNING_SETUP__ else None
 except NameError:
-    __LIGHTNING_SETUP__ = False
+    __LIGHTNING_SETUP__: bool = False
 
 if __LIGHTNING_SETUP__:
     import sys  # pragma: no-cover

pytorch_lightning/setup_tools.py

@@ -15,6 +15,7 @@
 import os
 import re
 import warnings
+from typing import Iterable, List
 from urllib.error import HTTPError, URLError
 from urllib.request import Request, urlopen
 
@@ -37,7 +38,7 @@
 ]
 
 
-def _load_requirements(path_dir, file_name='requirements.txt', comment_char='#'):
+def _load_requirements(path_dir: str , file_name: str = 'requirements.txt', comment_char: str = '#') -> List[str]:
     """Load requirements from a file
 
     >>> _load_requirements(PROJECT_ROOT)  # doctest: +ELLIPSIS +NORMALIZE_WHITESPACE
@@ -58,7 +59,7 @@ def _load_requirements(path_dir, file_name='requirements.txt', comment_char='#')
     return reqs
 
 
-def _parse_for_badge(text: str, path_badges: str = _PATH_BADGES, badge_names: list = _DEFAULT_BADGES):
+def _parse_for_badge(text: str, path_badges: str = _PATH_BADGES, badge_names: Iterable = _DEFAULT_BADGES) -> str:
     """ Returns the new parsed text with url change with local downloaded files
 
     >>> _parse_for_badge('Some text here... '  # doctest: +ELLIPSIS +NORMALIZE_WHITESPACE
@@ -90,25 +91,25 @@ def _parse_for_badge(text: str, path_badges: str = _PATH_BADGES, badge_names: li
     return text
 
 
-def _save_file(url_badge, save, extension, headers):
+def _save_file(url_badge: str, save_path: str, extension: str, headers: dict) -> None:
     """function for saving the badge either in `.png` or `.svg`"""
 
     # because there are two badge with name `PyPI Status` the second one is download
     if 'https://pepy.tech/badge/pytorch-lightning' in url_badge:
-        save += '_downloads'
+        save_path += '_downloads'
 
     try:
         req = Request(url=url_badge, headers=headers)
         resp = urlopen(req)
     except URLError:
         warnings.warn("Error while downloading the badge", UserWarning)
     else:
-        save += extension
-        with open(save, 'wb') as download_file:
+        save_path += extension
+        with open(save_path, 'wb') as download_file:
             download_file.write(resp.read())
 
 
-def _download_badge(url_badge, badge_name, target_dir):
+def _download_badge(url_badge: str, badge_name: str, target_dir: str) -> str:
     """Download badge from url
 
     >>> path_img = _download_badge('https://img.shields.io/pypi/pyversions/pytorch-lightning',
@@ -143,9 +144,10 @@ def _download_badge(url_badge, badge_name, target_dir):
                 url_badge = url_badge.replace('.png', '.svg')
                 _save_file(url_badge, save_path, extension='.svg', headers=headers)
                 return save_path + '.svg'
+            return ''
 
 
-def _load_long_description(path_dir):
+def _load_long_description(path_dir: str) -> str:
     """Load readme as decribtion
 
     >>> _load_long_description(PROJECT_ROOT)  # doctest: +ELLIPSIS +NORMALIZE_WHITESPACE

requirements/test.txt

@@ -12,6 +12,7 @@ scikit-learn>=0.22.2
 scikit-image>=0.17.2
 black>=20.8b1
 isort>=5.6.4
+mypy>=0.720
 pre-commit>=1.0
 
 cloudpickle>=1.3

setup.cfg

@@ -93,3 +93,88 @@ convention = pep257
 # D202: Ignore a blank line after docstring (collision with Python Black in decorators)
 add-ignore = D104,D107,D202
 max-line-length = 120
+
+
+[mypy]
+# Typing tests is low priority, but enabling type checking on the
+# untyped test functions (using `--check-untyped-defs`) is still
+# high-value because it helps test the typing.
+files = pytorch_lightning, pl_examples, benchmarks, tests
+disallow_untyped_defs = True
+ignore_missing_imports = True
+
+# todo: add proper typing to this module...
+[mypy-pytorch_lightning.callbacks.*]
+ignore_errors = True
+
+# todo: add proper typing to this module...
+[mypy-pytorch_lightning.core.*]
+ignore_errors = True
+
+# todo: add proper typing to this module...
+[mypy-pytorch_lightning.accelerators.*]
+ignore_errors = True
+
+# todo: add proper typing to this module...
+[mypy-pytorch_lightning.cluster_environments.*]
+ignore_errors = True
+
+# todo: add proper typing to this module...
+[mypy-pytorch_lightning.loggers.*]
+ignore_errors = True
+
+# todo: add proper typing to this module...
+[mypy-pytorch_lightning.logging.*]
+ignore_errors = True
+
+# todo: add proper typing to this module...
+[mypy-pytorch_lightning.metrics.*]
+ignore_errors = True
+
+# todo: add proper typing to this module...
+[mypy-pytorch_lightning.overrides.*]
+ignore_errors = True
+
+# todo: add proper typing to this module...
+[mypy-pytorch_lightning.profiler.*]
+ignore_errors = True
+
+# todo: add proper typing to this module...
+[mypy-pytorch_lightning.pt_overrides.*]
+ignore_errors = True
+
+# todo: add proper typing to this module...
+[mypy-pytorch_lightning.plugins.*]
+ignore_errors = True
+
+# todo: add proper typing to this module...
+[mypy-pytorch_lightning.root_module.*]
+ignore_errors = True
+
+# todo: add proper typing to this module...
+[mypy-pytorch_lightning.trainer.*]
+ignore_errors = True
+
+# todo: add proper typing to this module...
+[mypy-pytorch_lightning.distributed.*]
+ignore_errors = True
+
+# todo: add proper typing to this module...
+[mypy-pytorch_lightning.tuner.*]
+ignore_errors = True
+
+# todo: add proper typing to this module...
+[mypy-pytorch_lightning.utilities.*]
+ignore_errors = True
+
+# todo: add proper typing to this module...
+[mypy-pl_examples.*]
+ignore_errors = True
+
+# todo: add proper typing to this module...
+[mypy-benchmarks.*]
+ignore_errors = True
+
+# todo: add proper typing to this module...
+[mypy-tests.*]
+ignore_errors = True