.ceil（）数学函数不工作？

Question

Python解释器说paintRequiredCeiling是未定义的。我在代码中找不到任何错误。其目的是让程序从用户那里获得输入，然后计算出喷漆作业所需的成本/小时数。在

import math

def main():
    # Prompts user for sq and paint price
    totalArea = float(input("Total sq of space to be painted? "))
    paintPrice = float(input("Please enter the price per gallon of paint. "))

    perHour = 20
    hoursPer115 = 8

    calculate(totalArea, paintPrice, perHour, hoursPer115)
    printFunction()

def calculate(totalArea, paintPrice, perHour, hoursPer115):
    paintRequired = totalArea / 115
    paintRequiredCeiling = math.ceil(paintRequired)
    hoursRequired = paintRequired * 8
    costOfPaint = paintPrice * paintRequiredCeiling
    laborCharges = hoursRequired * perHour
    totalCost = laborCharges + costOfPaint

def printFunction():
    print("The numbers of gallons of paint required:", paintRequiredCeiling)
    print("The hours of labor required:", format(hoursRequired, '.1f'))
    print("The cost of the paint: $", format(costOfPaint, '.2f'), sep='')
    print("Total labor charges: $", format(laborCharges, '.2f'), sep='')
    print("Total cost of job: $", format(totalCost, '.2f'), sep='')

main()

Answer 1

变量paintRequiredCeiling仅在计算函数中可用。它不存在于你printFunction。与其他变量类似。您需要将它们移到函数之外，或者传递它们，才能使其工作。在

Answer 2

在您的calculate()函数中没有return语句：您正在计算所有这些值，然后在函数结束时丢弃它们，因为这些变量都是函数的局部变量。在

类似地，printFunction()函数不接受任何要打印的值。所以它期望变量是全局的，因为它们不是全局的，你就得到了错误。在

现在您可以使用全局变量，但这通常是错误的解决方案。相反，学习如何使用return语句返回calculate()函数的结果，将这些结果存储在main()中的变量中，然后将它们传递给printFunction()。在