Python 3.7.0 (v3.7.0:1bf9cc5093, Jun 27 2018, 04:59:51) [MSC v.1914 64 bit (AMD64)] on win32
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>>> x=float(input("ENter the radius of a sphere : "))
ENter the radius of a sphere : 6.2
>>> pi=22/7
>>> v=(4/3)*pi*x*x*x
>>> v
998.7078095238095
>>> #or we can do easily in this way
>>> v1=pi*(4/3)*x**3
>>> v1
998.7078095238095
>>> 
