即使进行了复制，原始列表仍会修改

Question

I have a list currentCell which contains info like coordinates and values and stuff. I then create a copy of that list using currentCellNew = currentCell.copy() . Im told that doing that and modifying the copy will NOT effect the original. But when i remove something from the copy, it also removes it from the original list.

Here is the code that removes from the copy:

#some variables exist outside of scope
        currentCell       = next(x for x in self.cells if x[0] == currentCellCoords)
        currentCellNew    = currentCell.copy()
        if currentCellNew[3] == 0:
            if **condition**:
                wallAxis = next(x[0] for x in list(self.Orientations.items()) if x[1] == "f")

#### Here is the code that removes the element from the copy #####
                currentCellNew[2].remove(next(x for x in currentCellNew[2] if x[0] == wallAxis))

Answer 1

list.copy() is a shallow copy; it's fine when the original list contains immutable objects, but it looks like you've got a list of list s, and those inner list s aren't being copied (the new outer list has references to the same inner list s as the first one).

You need to use the copy.deepcopy function to perform the original copy, thereby copying the contents, not just the top-level references:

import copy   # At top of file

...
currentCellNew    = copy.deepcopy(currentCell)