python list: append vs += [duplicate]

问题

This question already has answers here:

What is the difference between Python's list methods append and extend? (20 answers)

Why does += behave unexpectedly on lists? (9 answers)

Closed 2 years ago.

For Python list, is append() the same as +=? I know that + will lead to the creation of a new list, while append() just append new stuff to the old list. But will += be optimized to be more similar to append()? since they do the same thing.

回答1:

It's an __iadd__ operator. Docs.

Importantly, this means that it only tries to append. "For instance, if x is an instance of a class with an __iadd__() method, x += y is equivalent to x = x.__iadd__(y) . Otherwise, x.__add__(y) and y.__radd__(x) are considered, as with the evaluation of x + y."

This thread specifically deals with lists and their iadd behavior

来源：https://stackoverflow.com/questions/53112952/python-list-append-vs