Add mypy for type checking

Author: jhamrick

.gitignore

@@ -101,14 +101,12 @@ gh_api.sqlite
 MANIFEST
 README
 .pytest_cache
-
 venv/
-
 gradebook.db
 .buildconfig
 *~
 .vscode/
 package-lock.json
 .goutputstream*
 .idea
-
+.mypy_cache

dev-requirements.txt

@@ -2,6 +2,7 @@ pytest>=4.5
 pytest-cov
 pytest-rerunfailures
 pytest-xdist
+pytest-mypy
 coverage
 selenium
 sphinx

mypy.ini

@@ -0,0 +1,2 @@
+[mypy]
+ignore_missing_imports = True

tasks.py

@@ -60,6 +60,7 @@ def _run_tests(mark, skip, junitxml, paralell=False):
     if paralell:
         cmd.extend(['--numprocesses', 'auto'])
     cmd.extend(['--reruns', '4'])
+    cmd.extend(['--mypy'])
 
     marks = []
     if mark is not None: