Why does modifying copy of array affect original?

Question

Hi everyone I am sorry if this is a noob question but I am using python and I have an issue where I copy an array but then when I modify the copy it affects the original. I

Answer 1

This is one of the most surprising things about Python - the = operator never makes a copy of anything! It simply attaches a new name to an existing object.

If you want to make a copy of a list, you can use a slice of the list; the slicing operator does make a copy.

toAdd=xyzCoord[i][:]

You can also use copy or deepcopy from the copy module to make a copy of an object.