如何將變量從一個函數傳遞到另一個函數？

Question

def getInt():
    while True:
        width = int(input("Enter width (1 - 60):"))
        if width > 1 and width < 60:
            break
        else:
            print("Please enter a valid input")
    while True:
        height = int(input("Enter width (1 - 20):"))
        if height > 1 and height < 20:
            break
        else:
            print("Please enter a valid input")
    return width, height


def calcPerimeter(width, height):
    perimeter = (2 * (width + height))
    return perimeter  

def calcArea(width, height):
    area = width * height
    return area


def main():
print('Results: {}'.format(getInt()))
print('The perimeter is {}' .format(calcPerimeter(width, height)))
print('The area is {}' .format(calcArea(width, height)))


main()

當我跑步時，它說：

追溯（最近一次通話）：

主要（）

print（'周長為{}'.format（calcPerimeter（width，height）））

NameError：名稱“寬度”未定義

Answer 1

也許您可以嘗試將main（）更改為此

def main():
  width, height = getInt()
  print('Results: {}, {}'.format(width, height))  
  print('The perimeter is {}' .format(calcPerimeter(width, height)))
  print('The area is {}' .format(calcArea(width, height)))

您需要先將getInt（）返回特定的變量，然后再傳遞給另一個函數

其他方法是在getInt（）函數中調用calculatePerimeter和calculateArea，這是示例

def getInt():
    while True:
        width = int(input("Enter width (1 - 60):"))
        if width > 1 and width < 60:
            break
        else:
            print("Please enter a valid input")
    while True:
        height = int(input("Enter width (1 - 20):"))
        if height > 1 and height < 20:
        break
        else:
            print("Please enter a valid input")
    return calcPerimeter(width, height), calcArea(width, height)


def calcPerimeter(width, height):
    perimeter = (2 * (width + height))
    return perimeter  

def calcArea(width, height):
    area = width * height
    return area


def main():
  perimeter, area = getInt()
  print('Perimeter is {}, area is {}'.format(perimeter, area))  


main()

Answer 2

一種方法是使用全局關鍵字。 另一種方法是從函數返回所需的變量並將其保存在全局范圍內。

Answer 3

您應該閱讀這篇文章，並通常研究可變范圍的規則。 作為程序員，這是必不可少的知識。

作用域規則的簡短說明？

Answer 4

請參閱此（鏈接）[ http://python-textbok.readthedocs.io/en/1.0/Variables_and_Scope.html]以了解為什么將main函數更改為Po的答案會導致代碼正確運行。

在函數calcPerimeter和calcArea中定義的變量對main函數不可見/不可訪問，因為它們的作用域不同。

Answer 5

#I think i have resolved your problem.In your case it was returning list/tuple .you have to convert it into simple variable
def getInt():
  while True:
     width = int(input("Enter width (1 - 60):"))
     if width > 1 and width < 60:
        break
     else:
        print("Please enter a valid input")
while True:
    height = int(input("Enter height (1 - 20):"))
    if height > 1 and height < 20:
        break
    else:
        print("Please enter a valid input")
return width,height


 def calcPerimeter(width, height):
   hw=width+height
   perimeter = 2*hw
   return perimeter  

def main():
  width,height= getInt()
  p=calcPerimeter(width, height)
  print('The perimeter is %s'%p)
  a=calcArea(width, height)
  print('The area is %s'%a)


main()