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There is no bug... yet. Unless you modify the default argument.

Sometimes I just want to monkeypatch the list to be immutable in my app.



I'd consider this a bug and not expected behavior.

  def make_pizza(crust=THIN, toppings=[], cheese=REGULAR, sauce=TOMATO):
    // first call: toppings=["peperoni"]
    // second call: toppings=["peperoni", "sausage"]
    // third call: toppings=["peperoni", "sausage"]

  make_pizza(toppings=["peperoni"])
  make_pizza(toppings=["sausage"])
  make_pizza()




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