

pi=3.14

def add(a,b):
    return a+b

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

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

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


def main():
    print("mymod testcode")
    print("add",add(10,20))
    print("substract",substract(20,10))

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