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Exercise 13

Without running the following code, what do you think it will do?

def foo(first, second=3, third):
    print(first)
    print(second)
    print(third)

foo(42)

Solution

The code will raise an error:

SyntaxError: non-default argument follows
default argument

Here, we've defined foo with three parameters, with the second parameter having a default value. This is an error, however. Once Python sees a positional parameter with a default value, all subsequent parameters must have default values.

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