What is the output of the following Python code?def f(x, l=[]): l.append(x) return l print(f(1), f(2), f(3))

def f(x, l=[]):
    l.append(x)
    return l
print(f(1), f(2), f(3))

Explanation

The default list is created once and shared; all three calls return that same list, which holds [1, 2, 3] when print displays it.