import math

a=math.pi
print(a)
print(math.pi)

math.sqrt(4)
math.log(8)

math.sin(math.pi/4)
math.cos(math.pi/4)

import datetime

dt1=datetime.date.today()

dt2= datetime.date(2008,10,24)
print(dt2)

age=dt1-dt2
print(age)

dt3=datetime.datetime.now()
print(dt3)