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In [1]: from math import pi
from math import pi
In [3]: def volume(r): if r < 0: return False return (4/3)*pi*(r**3) volume(3)
def volume(r): if r < 0: return False return (4/3)*pi*(r**3) volume(3)
Out[3]: 113.09733552923254
113.09733552923254