ZeroDivisionError: float division (baby steps)

[Artemisio]

I am a non programmer who just started with Python. So far I love it.

I would appreciate if you could help me fix this error I get taking this exercise:

count= 0
sum= 0.0
number= 1
print "Enter 0 to exit the loop"

while number != 0 :
	number= input("Enter a number: ")

count= count + 1
sum= sum + number

count= count -1
print "The average is: ",sum/count
#the error is in the above line

"ZeroDivisionError: float division"

Thank you in advance, Len