typecheck django tests, allow failures

scripts/.gitignore

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+django-sources/

scripts/typecheck_django_tests.xsh

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+#!/usr/local/bin/xonsh
+
+import os
+if not os.path.exists('./django-sources'):
+    git clone -b stable/2.1.x https://github.com/django/django.git django-sources
+
+ignored_error_patterns = ["Need type annotation for"]
+for line in $(mypy --config-file typecheck_tests.ini ./django-sources/tests/files).split('\n'):
+    for pattern in ignored_error_patterns:
+        if pattern in line:
+            break
+    else:
+        print(line)
+

scripts/typecheck_tests.ini

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+[mypy]
+strict_optional = False
+ignore_missing_imports = True
+check_untyped_defs = True
+warn_no_return = False
+show_traceback = True
+warn_redundant_casts = True
+
+plugins =
+    mypy_django_plugin.main