Question

这是作业。这所特殊的学校提供0帮助，教授不太乐于助人。我只是在寻找指导，为什么这段代码不起作用。我有使用Python 2.7。当我运行程序时，它要求我输入适当数量的品脱，但什么都不做。

# 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()中存在无限循环，因为counter仅在当前值小于先前值时递增。例如输入值1, 2, 3, 4, 5, 6, 7将导致无限循环，但是，如果您输入7, 6, 5, 4, 3, 2, 1，则循环将终止。

函数getHigh()有类似的问题，但如果要避免无限循环，则值必须是递增的。请注意，getLow()或getHigh()中的一个将始终在您的代码中生成一个循环。

提示：看看使用Python的min()和max()函数。

我的显示模块不显示（Python 2.7）

1 个答案: