Add show_error_codes option to mypy config (#5032)

This causes mypy to show error codes in its output, which can be used to ignore specific type errors rather than blanket ignores. For example, given an error like: ``` cirq-core/cirq/_compat.py:37: error: Name 'cached_property' already defined (possibly by an import) [no-redef] ``` we can then do: ```python from backports.cached_property import cached_property # type: ignore[no-redef] ``` Which ignores just that specific type error and also helps document what the error is.
quantumlib · Feb 26, 2022 · d696635 · d696635
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diff --git a/dev_tools/conf/mypy-next.ini b/dev_tools/conf/mypy-next.ini
@@ -1,4 +1,5 @@
 [mypy]
+show_error_codes = true
 
 [mypy-__main__]
 follow_imports = silent

diff --git a/dev_tools/conf/mypy.ini b/dev_tools/conf/mypy.ini
@@ -1,4 +1,5 @@
 [mypy]
+show_error_codes = true
 
 [mypy-__main__]
 follow_imports = silent