Issue that I've been involved with as part of this particular project.

Python issue	Title	Issue type	Fix
https://bugs.python.org/issue29924	Useless argument in call to PyErr_Format	Code quality	python/cpython#854
https://bugs.python.org/issue29932	Missing word ("be") in error message ("first argument must a type object")	Error message	python/cpython#888
https://bugs.python.org/issue30592	Bad error message 'bool()() takes no keyword arguments'	Error message/regression	python/cpython#1996
https://bugs.python.org/issue30600	Error message incorrect when index is called with keyword argument ("[].index(x=2)")	Argument clinic	python/cpython#2051
https://bugs.python.org/issue30627	Incorrect error message for a few functions called with keywod argument	Argument handling	python/cpython#2115
https://bugs.python.org/issue35965	Behavior for unittest.assertRaisesRegex differs depending on whether it is used as a context manager	Invalid issue
https://bugs.python.org/issue36026	Different error message when sys.settrace is used	Error message	python/cpython#11930
https://bugs.python.org/issue30878	The staticmethod doesn't properly reject keyword arguments	Argument handling	python/cpython#2635