Prevent assignment to None for non-Optional class variables #20054
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Python 3.5 has been dead for a long time
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Diff from mypy_primer, showing the effect of this PR on open source code: tornado (https://github.com/tornadoweb/tornado)
+ tornado/util.py:240: error: Incompatible types in assignment (expression has type "None", variable has type "dict[str, Any]") [assignment]
+ tornado/httputil.py:469: error: Incompatible types in assignment (expression has type "None", variable has type "str") [assignment]
+ tornado/httputil.py:470: error: Incompatible types in assignment (expression has type "None", variable has type "str") [assignment]
+ tornado/httputil.py:473: error: Incompatible types in assignment (expression has type "None", variable has type "Future[None]") [assignment]
+ tornado/netutil.py:519: error: Incompatible types in assignment (expression has type "None", variable has type "int") [assignment]
+ tornado/iostream.py:1327: error: Incompatible types in assignment (expression has type "None", variable has type "SSLSocket") [assignment]
+ tornado/httpclient.py:179: error: Incompatible types in assignment (expression has type "None", variable has type "dict[IOLoop, AsyncHTTPClient]") [assignment]
+ tornado/httpclient.py:342: error: Incompatible types in assignment (expression has type "None", variable has type "dict[str, str] | HTTPHeaders") [assignment]
+ tornado/httpclient.py:629: error: Incompatible types in assignment (expression has type "None", variable has type "HTTPRequest") [assignment]
+ tornado/web.py:208: error: Incompatible types in assignment (expression has type "None", variable has type "list[OutputTransform]") [assignment]
+ tornado/web.py:209: error: Incompatible types in assignment (expression has type "None", variable has type "list[str]") [assignment]
+ tornado/web.py:210: error: Incompatible types in assignment (expression has type "None", variable has type "dict[str, str]") [assignment]
+ tornado/websocket.py:837: error: Incompatible types in assignment (expression has type "None", variable has type "IOStream") [assignment]
+ tornado/websocket.py:1399: error: Incompatible types in assignment (expression has type "None", variable has type "WebSocketProtocol") [assignment]
+ tornado/test/web_test.py:224: error: Incompatible types in assignment (expression has type "None", variable has type "Future[Any]") [assignment]
dd-trace-py (https://github.com/DataDog/dd-trace-py)
+ ddtrace/internal/remoteconfig/_pubsub.py:85: error: Incompatible types in assignment (expression has type "None", variable has type "PublisherSubscriberConnector") [assignment]
+ ddtrace/internal/remoteconfig/_pubsub.py:86: error: Incompatible types in assignment (expression has type "None", variable has type "RemoteConfigPublisherBase") [assignment]
+ ddtrace/internal/remoteconfig/_pubsub.py:87: error: Incompatible types in assignment (expression has type "None", variable has type "RemoteConfigSubscriber") [assignment]
+ ddtrace/llmobs/_llmobs.py:186: error: Incompatible types in assignment (expression has type "None", variable has type "LLMObs") [assignment]
arviz (https://github.com/arviz-devs/arviz)
+ arviz/data/io_pyro.py:24: error: Incompatible types in assignment (expression has type "None", variable has type "int") [assignment]
+ arviz/data/io_pyro.py:25: error: Incompatible types in assignment (expression has type "None", variable has type "int") [assignment]
+ arviz/data/io_numpyro.py:87: error: Incompatible types in assignment (expression has type "None", variable has type "int") [assignment]
+ arviz/data/io_numpyro.py:88: error: Incompatible types in assignment (expression has type "None", variable has type "int") [assignment]
alerta (https://github.com/alerta/alerta)
+ alerta/models/alarms/__init__.py:22: error: Incompatible types in assignment (expression has type "None", variable has type "str") [assignment]
+ alerta/models/alarms/__init__.py:23: error: Incompatible types in assignment (expression has type "None", variable has type "str") [assignment]
+ alerta/models/alarms/__init__.py:24: error: Incompatible types in assignment (expression has type "None", variable has type "str") [assignment]
+ alerta/models/alarms/__init__.py:25: error: Incompatible types in assignment (expression has type "None", variable has type "str") [assignment]
stone (https://github.com/dropbox/stone)
+ stone/backend.py:92: error: Incompatible types in assignment (expression has type "None", variable has type "ArgumentParser") [assignment]
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Python 3.5 has been dead for a long time.