While loop with sentinel-controlled repetiton.

 
total = 0          
gradeCounter = 0   

grade = raw_input( "Enter grade, -1 to end: " )   # get one grade
grade = int( grade )                              # convert string to an integer

while grade != -1:
   total = total + grade
   gradeCounter = gradeCounter + 1
   grade = raw_input( "Enter grade, -1 to end: " )
   grade = int( grade )

if gradeCounter != 0:
   average = float( total ) / gradeCounter
   print "Class average is", average
else:
   print "No grades were entered"

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While loop with sentinel-controlled repetiton. : While « Language Basics « Python

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