# Function that calculates something
# Volume of a sphere
# pi is in math
from math import *

# Function definitions
def volume(radius):
    return (4/3) * pi * radius**3

def area_rectangle(length, width):
    return length*width

# This will stop the following code from running when we import from this file
# Feel free to leave this bit off in the lab
if __name__ == "__main__":
    
    # Ok, now we use the functions
    
    rad = float(input("Enter the radius:  "))
    
    # Function call
    # Result shouldn't be named "volume", because that was the name of the function
    vol = volume(rad)
    
    print("The volume was:  ", vol)