Typing: switch to a newer version of MyPy to check types

tests/CrawlerProcess/asyncio_deferred_signal.py

@@ -1,5 +1,6 @@
 import asyncio
 import sys
+from typing import Optional
 
 from scrapy import Spider
 from scrapy.crawler import CrawlerProcess
@@ -31,6 +32,7 @@ class UrlSpider(Spider):
 
 
 if __name__ == "__main__":
+    ASYNCIO_EVENT_LOOP: Optional[str]
     try:
         ASYNCIO_EVENT_LOOP = sys.argv[1]
     except IndexError:

tox.ini

@@ -35,7 +35,10 @@ install_command =
 [testenv:typing]
 basepython = python3
 deps =
-    mypy==0.780
+    lxml-stubs==0.2.0
+    mypy==0.910
+    types-pyOpenSSL==20.0.3
+    types-setuptools==57.0.0
 commands =
     mypy --show-error-codes {posargs: scrapy tests}