total = 0 # sum of gradesgradeCounter = 0 # number of grades enteredwhile 1: grade = raw_input( "Enter grade, -1 to end: " ) grade = int( grade ) # exit loop if user inputs -1 if grade == -1: break total += grade gradeCounter += 1 if gradeCounter != 0: average = float( total ) / gradeCounter print "Class average is", averageelse: print "No grades were entered"
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