copy_insight.md

Insights about copy in python

🐒 '=' & copy.copy() & copy.deepcopy()

• '=' just give the id(raw) to copy_0, meaning raw and copy_0 point at the same memory block
• copy.copy() is shallow copy, which just store the contents of raw not containing sub-variable. For the contents containing sub-variables, it choose to point at the same memory block just as '=' does, such as raw[1]=[2, 3]
• copy.deepcopy() is deep copy, which create a memory block to store the whole contents of raw

⭐ we can call func id() to check the memory address

copy_0 = raw
copy_1 = copy.copy(raw)
copy_2 = copy.deepcopy(raw)