Question: > > > def f ( x ) : . . . if x = = 0 : . . . return zero . .

>>> def f(x):
... if x ==0:
... return "zero"
... elif x >0:
... return "positive"
... else:
... return ""
>>>0 or f(1)
______
>>> f(0) or f(-1)
______
>>> f(0) and f(-1)
______

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