import math 

print(math.pi)
print(math.sqrt(4.0))

import math as m

print(m.sqrt(4.0))

from math import pi
print(pi)

from math import *
print(pi)
print(sqrt(4.0))

from math import sqrt as s
print(s(4.0))

from math import pi as p, sqrt as s 
print(p)
print(s(2.0))

import sys

print(sys.builtin_module_names)

import masth 

print(dir(math))