How to clone or copy a set in Python?

Question

For copying a list: shallow_copy_of_list = old_list[:].

For copying a dict: shallow_copy_of_dict = dict(old_dict).

But for a

Answer 1

Besides the type(x)(x) hack, you can import copy module to make either shallow copy or deep copy:

In [29]: d={1: [2,3]}

In [30]: sd=copy.copy(d)
    ...: sd[1][0]=321
    ...: print d
{1: [321, 3]}

In [31]: dd=copy.deepcopy(d)
    ...: dd[1][0]=987
    ...: print dd, d
{1: [987, 3]} {1: [321, 3]}

From the docstring:

Definition: copy.copy(x)
Docstring:
Shallow copy operation on arbitrary Python objects.