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Using the break statement to avoid repeating code in the class-average program

total = 0          # sum of grades gradeCounter = 0   # number of grades entered while 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", average else:    print "No grades were entered"