Add mypy check to CI (#618)

我先 Merge 了，然后按照保存一个个改旧的 Typing 问题吧。

.github/workflows/CI.yml

@@ -42,3 +42,25 @@ jobs:
           file: ./coverage.xml
           flags: unittests
           name: codecov-umbrella
+  mypy:
+    name: mypy-check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python
+        uses: actions/setup-python@v1
+        with:
+          python-version: 3.8
+      - name: Install Dependencies
+        run: |
+          pip install poetry
+          poetry install
+          poetry run pip install mypy
+      - name: mypy
+        run: |
+          # run mypy, tee output to file
+          poetry run mypy --show-column-numbers --hide-error-context wechatpy | tee /tmp/mypy.out
+          exit_code="${PIPESTATUS[0]}"
+          # analyze output
+          poetry run python .github/workflows/github.py /tmp/mypy.out
+          exit $exit_code

.github/workflows/github.py

@@ -0,0 +1,46 @@
+"""
+quick script to write mypy errors to github comments
+"""
+import re
+import sys
+
+
+MYPY_REGEX = (
+    r"^(\w:)?(?P<file>[^:]+):(?P<line>\d+):((?P<col>\d+):)?"
+    r"\s*(?P<type>[^:]+):\s*(?P<msg>.+)"
+)
+MYPY = re.compile(MYPY_REGEX)
+
+
+def error(
+    file: str, line: int = 0, col: int = 0, message: str = "error", warn: bool = False
+) -> None:
+    """write an error to stdout"""
+    kind = "warning" if warn else "error"
+    print(f"::{kind} file={file},line={line},col={col}::{message}")
+
+
+def main(file_path: str) -> None:
+    """read the given file, and print errors"""
+    data = ""
+    with open(file_path) as file:
+        data = file.read()
+
+    for line in data.split("\n"):
+        match = MYPY.match(line)
+        if match:
+            values = match.groupdict()
+            error(
+                values["file"],
+                line=int(values["line"]),
+                col=int(values["col"]),
+                message=values["msg"],
+            )
+
+
+if __name__ == "__main__":
+    if len(sys.argv) != 2:
+        print("you must specify a json file path!")
+        sys.exit(1)
+    file_path = sys.argv[1]
+    main(file_path)

mypy.ini

@@ -0,0 +1,18 @@
+# MyPy config file
+# File reference here - http://mypy.readthedocs.io/en/latest/config_file.html#config-file
+
+[mypy]
+warn_redundant_casts = True
+warn_unused_ignores = True
+
+# Needed because of bug in MyPy
+disallow_subclassing_any = False
+
+[mypy-*]
+disallow_untyped_calls = True
+disallow_untyped_defs = True
+check_untyped_defs = True
+warn_return_any = True
+no_implicit_optional = True
+strict_optional = True
+ignore_missing_imports = True