我的显示模块不显示(Python 2.7)

Question

这是做作业用的。这所特殊的学校提供0的帮助，而教授则没有多大帮助。我只是在寻求关于为什么这段代码不起作用的指导。我必须使用Python2.7。当我运行程序时，它要求我输入适当数量的品脱，但之后什么也不做。

# This program finds the average number of pints collected, the highest amount, and the lowest amount

# Lab 9-4 Blood drive

#the main function
def main():
    endProgram = 'no'
  print
  while endProgram == 'no':
    print
    # declare variables
    pints = [0] * 7
    totalPints = 0
    averagePints = 0
    highPints = 0
    lowPints = 0


    # function calls
    pints = getPints(pints)
    totalPints = getTotal(pints, totalPints)
    averagePints = getAverage(totalPints, averagePints)
    highPints = getHigh(pints, highPints)
    lowPints = getLow(pints, lowPints)
    displayInfo(averagePints, highPints, lowPints)

    endProgram = raw_input('Do you want to end program? (Enter no or yes): ')
    while not (endProgram == 'yes' or endProgram == 'no'):
      print 'Please enter a yes or no'
      endProgram = raw_input('Do you want to end program? (Enter no or yes): ')

#the getPints function
def getPints(pints):
  counter = 0
  while counter < 7:
      pints[counter] = input('Enter pints collected: ')
      counter = counter + 1
  return pints

#the getTotal function
def getTotal(pints, totalPints):
    counter = 0
    while counter < 7:
        totalPints = totalPints + pints[counter]
        counter = counter + 1
    return totalPints

#the getAverage function
def getAverage(totalPints, averagePints):
    averagePints = totalPints / 7
    return averagePints

#the getHigh function
def getHigh(pints, highPints):
    highPints = pints[0]
    counter = 1
    while counter < 7:
        if pints[counter] > highPints:
            highPints = pints[counter]
            counter = counter + 1
    return highPints



#the getLow function
def getLow(pints, lowPints):
    lowPints = pints[0]
    counter = 1
    while counter < 7:
        if pints[counter] < lowPints:
            lowPints = pints[counter]
            counter = counter + 1
    return lowPints

#the displayInfo function
def displayInfo(averagePints, highPints, lowPints):
    print "The average number of pints donated is ", averagePints
    print "The highest pints donated is ", highPints
    print "The lowest pints donated is ", lowPints

# calls main
main()

Answer 1

函数getLow()中有一个无限循环，因为只有当当前值小于前一个值时，counter才会增加。例如，输入值1, 2, 3, 4, 5, 6, 7将导致无限循环，但是，如果输入7, 6, 5, 4, 3, 2, 1，则循环将终止。

函数getHigh()也有类似的问题，但是如果要避免无限循环，则这些值必须是上升的。请注意，getLow()或getHigh()之一将始终在代码中生成一个循环。

提示:看看如何使用Python的min()和max()函数。