How to deep copy a list?

Question

I have some problem with a List copy:

So After I got E0 from \'get_edge\', I make a copy of E0 by calling \'E0_copy =

Answer 1

Regarding the list as a tree, the deep_copy in python can be most compactly written as

def deep_copy(x):
    if not isinstance(x, list): return x
    else: return map(deep_copy, x)