print("helloworld!")

def circumference(r1):
    '''
    Function to calculate the circumference of a circle with radius r1
    '''
    return 2*np.pi*r1


print("helloworld!")

def circumference(r1):
    '''
    Function to calculate the circumference of a circle with radius r1
    '''
    return 2*np.pi*r1


Function to calculate the circumference of a circle with radius r1