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#!/usr/bin/env python3

l = [set()] * 5 # All the elements are pointing to the same object!

def fuckme(arg = []):
  arg.append(1)
  print(arg)
for i in range(3):
  fuckme() # all the invokations the default args are pointing to the same object!
  
def outer():
  counter = 0
  def inner():
    counter += 1 # No you can't mutate the outer variable! So that's why we have `nonlocal` keyword...