# mymod.py

pi = 3.14
def add(a,b):
    return a+b

def subtract(a,b) :
    return a-b

def multiply(a, b):
    return a*b

def divide(a,b):
    return a/b

def main():
    print("mymod test code")
    print("add",add(10,20))
    print("subtract",subtract(20,10))

if __name__ == "__main__":
    main()
#print(__name__)



