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In [1]:

    
import math as m



In [2]:

    
print(m.pi)









    



3.141592653589793



In [3]:

    
# print(math.pi)
# NameError: name 'math' is not defined



In [4]:

    
from math import pi as PI



In [5]:

    
print(PI)









    



3.141592653589793



In [6]:

    
# print(pi)
# NameError: name 'pi' is not defined