Calculating Stuff | Python Fiddle

#alert the user of how to use program
print "Enter a series of positive numbers, followed by a negative number"

#declare array of numbers to stored entered data
numbers = []

#loop indefinitely until a negative number is found, then break out of the loop
while True:
    
    #input a number and make sure it's stored as a float
    n = float(input("Please enter a number: "))
    
    #if number is negative, get out
    if n < 0:
    	break
        
    #if number not negative, store it in array
    numbers.append(n)
    
    #show what has been entered
    print "You entered ", n, "Keep going ..."
    
#if the first number entered was negative, 'numbers' array should be empty    
if len(numbers) == 0:
    print "you only entered a negative number, see ya"
    
#if the array is not empty, use built in functions to calculate stuff    
else:
    print "The minimum positive number you entered is: ", min(numbers)
    print "The maximum positive number you entered is: ", max(numbers)
    print "The average of the numbers you entered is: ", sum(numbers)/len(numbers)

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