>>> abs(-10) 10
>>> abs <built-in function abs>
>>> x = abs(-10) >>> x 10
>>> f = abs >>> f <built-in function abs>
>>> f = abs >>> f(-10) 10
>>> abs = 10 >>> abs(-10) Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: 'int' object is not callable
def add(x, y, f): return f(x) + f(y)
x ==> -5 y ==> 6 f ==> abs f(x) + f(y) ==> abs(-5) + abs(6) ==> 11
>>> add(-5, 6, abs) 11
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