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Output: function with a list default argument, called three times appending a value

EasyP1Output

What does this Python code print?

1def add(item, items=[]):
2    items.append(item)
3    return items
4 
5print(add(1))
6print(add(2))
7print(add(3, []))
8print(add(4))

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One line per print, as Python prints it. An uncaught exception as its last traceback line, for example ZeroDivisionError: division by zero.

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