Transferring ownership of function argument to function in Python (aka move semantics)

move.py

import psutil

def rss(label):
  print(label, psutil.Process().memory_info().rss)

class Wrapper:
  def __init__(self, value):
    self.value = value

  def __call__(self):
    value = self.value
    del self.value
    return value

def copy():
  def copy_func(x):
    rss('entered function')
    del x
    rss('done with object')

  rss('[copy test]')
  x = [None] * 10**8
  rss('initialized object')
  copy_func(x)
  rss('exited function')

def move():
  def move_func(x):
    rss('entered function')
    x = x()
    rss('unwrapped object')
    del x
    rss('done with object')

  rss('[move test]')
  x = [None] * 10**8
  x = Wrapper(x)
  rss('initialized object')
  move_func(x)
  rss('exited function')

if __name__ == '__main__':
  copy()
  print()
  move()