"""
python constants

constants are special variables

compare constants with variables

"""

# PI = 3.1415
# r = 2
# circle_area = PI* r**2
# print("circle_area = ", circle_area)

import py200620_chen.py200627_02.myconst as myconst

r = 2
circle_area = myconst.PI * r**2
print("circle_area = ", circle_area)

