Steve D'Aprano wrote:
In practice, identity is hardly important in Python, except for a few limited cases, and the prohibition against using `is` when you mean `==`.
On the contrary, it's a very important concept needed to make sense of the way things behave when mutation is involved. Witness e.g. the classic newbie mistake of using [[0]*5]*5 to create a matrix of zeroes. I don't know how to explain why that goes wrong without using the phrase "same object" in some way. -- Greg -- https://mail.python.org/mailman/listinfo/python-list
