在Python中删除列表的最后一个元素

Question

I've been working on a project in Python, coding a little game that's basically the number version of mastermind. Anyway, I came across a bug in my program and I'm curious as to why this is:

I had a list, and when removing the last element of the list, the order of the remaining elements changed. For example:

myList = [4, 4, 5, 4]

myList.remove(myList[3])

The contents of the list were now [4, 5, 4] instead of [4, 4, 5] . This did not happen with most other combinations of numbers which is why I am confused. Also, if I instead use:

myList = myList[:-1]

This works and the contents are in the correct order... Does anyone know why removing the last element the first way didn't work in this case?

Answer 1

myList.remove(myList[3])

is the same as doing

myList.remove(4)

and remove always removes the first instance. You should try doing:

del a[-1]

or as mentioned by @Megalng

a.pop()

which also returns the removed element

Answer 2

del myList[-1]

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