def square(n):
    print "In square function"
    return n*n
   # print "Hello world"  # won't be executed


def sum(n):
    #Computes the sum 1+2+3+...+n
    result = 0
    for i in range(1,n+1):
       result = result + i
       # result += i
    return result   
    
def printStars(n):
    for i in range(1,n+1):
        print "*",
    print    
    
    
print square(5)   
n = 6
# compute n cubed
ncubed = square(n)*n
print "ncubed = ", ncubed

print "Sum from 1 to 7 =",
print sum(7)
printStars(8)
print printStars(20)  # prints "None"