4150 new_list = my_list doesn't actually create a second list. The assignment just copies the reference to the list, not the actual list, so both new_list and my_list refer to the same list after the assignment. …

Jan 25, 2011 · To get a fully independent copy of an object you can use the copy.deepcopy() function. For more details about shallow and deep copying please refer to the other answers to this question …

May 6, 2017 · Below code demonstrates the difference between assignment, shallow copy using the copy method, shallow copy using the (slice) [:] and the deepcopy. Below example uses nested lists …

copy() is a shallow copy function. If the given argument is a compound data structure, for instance a list, then Python will create another object of the same type (in this case, a new list) but for everything …

The latter is called to implement the deep copy operation; it is passed one argument, the memo dictionary. If the __deepcopy__() implementation needs to make a deep copy of a component, it …

Mar 18, 2010 · When we do a .copy() on dictionary, by default, it will only do a shallow copy, which means it copies all the immutable values into a new dictionary but does not copy the mutable values, …

How do I copy a file in Python? copy2(src,dst) is often more useful than copyfile(src,dst) because: it allows dst to be a directory (instead of the complete target filename), in which case the basename of …

Apr 21, 2014 · If you really need to handle shallow-copying arbitrary types (silently reusing the existing object for immutable types like str), you'd just use the copy module, and do shallow_copy_of_x = …

Feb 13, 2014 · So, is the only way to get a deepcopy of a list by using the copy module? Seems strange that Python doesn't include deep copy in its standard functionality.

Feb 24, 2011 · 653 I would like to make a deep copy of a dict in python. Unfortunately the .deepcopy() method doesn't exist for the dict. How do I do that?