带有显示菜单的 python 程序中的语法错误

Question

我是第一次学习Python。我有一个语法错误，我不知道是我编码错误还是我只是有一个简单的拼写错误。我已将菜单拉出并放入新的 window 中，语法错误与我对菜单的编码有关。我相信它在编码显示 menu() 附近的某个地方。如果找到答案，我将不胜感激解释为什么它不正确。（编码中可能还有其他一些错误，但我卡在菜单上了。之后我会处理出现的任何其他问题。尽管提出建议，我们将不胜感激。）

    #This program allow for the user to convert weight managements

#Import Modules
import KilogramConversion
import PoundConversion
import TonConversion

    #Menu choice constants

CONVERT_KILOGRAMS_OUNCE=1
CONVERT_KILOGRAMS_POUND=2
CONVERT_POUND_OUNCE=3
CONVERT_POUND_TON=4
CONVERT_TON_POUND=5
CONVERT_TON_OUNCE=6
CONVERT_TON_KILOGRAMS=7
QUIT_CHOICE=8

    # Main Function
def main():
    choice=0

while choice != QUIT_CHOICE:
    display menu()
    choice=int(input('Enter your choice:'))

    #Perform menu choice
    if choice == CONVERT_KILOGRAMS_OUNCE:
        kilo=float(input("Enter weight in Kilograms:"))
        print('The weight in ounces is:', KilogramConversion.ounce(kilo))
    elif choice == CONVERT_KILOGRAMS_POUND:
        kilo=float(input("Enter weight in Kilograms:"))
        print('The weight in pounds is:', KilogramConversion.pound(kilo))
    elif choice == CONVERT_POUND_OUNCE:
        lbs=float(input("Enter weight in Pounds:"))
        print('The weight in ounces is:', PoundConversion.ounce(lbs))
    elif choice == CONVERT_POUND_TON:
        lbs=float(input("Enter weight in Pounds:"))
        print('The weight in tons is:', PoundConversion.ton(lbs))
    elif choice == CONVERT_TON_POUND:
        tons= float(input("Enter weight in Tons:"))
        print('The weight in pounds is:', TonConversion.pound(tons))
    elif choice == CONVERT_TON_OUNCE:
        tons= float(input("Enter weight in Tons:"))
        print('The weight in ounces is:', TonConversion.ounce(tons))
    elif choice == CONVERT_TON_KILOGRAMS:
        tons= float(input("Enter weight in Tons:"))
        print('The weight in kilograms is:', TonConversion.kilogram(tons))
    elif choice == QUIT_CHOICE:
        print('Exiting...')
    else:
        print('Invalid Selection')

def display menu():
    print('          ')
    print('          ')
    print('          Menu')
    print('1. Kilograms to Ounce')
    print('2. Kilograms to Pound')
    print('3. Pound to Ounce')
    print('4. Pound to Ton')
    print('5. Ton to Pound')
    print('6. Ton to Ounce')
    print('7. Ton to Kilograms')
    print('8. Quit')

main()

Answer 1

第 24 行：您调用了 display menu() 而不是 display_menu()。另外，你需要在调用它之前定义display_menu()。

Answer 2

你不能有一个包含 space 的函数名称，将其替换为下划线 _ ，它应该可以工作。

参见 Python PEP 8。必须严格遵守命名变量的规则。

1) 函数名应该是小写的， 个单词用下划线分隔，而不是 space s 根据需要提高可读性。

2) 混合大小写仅在已经是主流风格的上下文中才允许变量...

因此您更新后的代码将如下所示：

    #This program allow for the user to convert weight MANAGEMENTS

#Import Modules
import KilogramConversion
import PoundConversion
import TonConversion

    #Menu choice constants

CONVERT_KILOGRAMS_OUNCE=1
CONVERT_KILOGRAMS_POUND=2
CONVERT_POUND_OUNCE=3
CONVERT_POUND_TON=4
CONVERT_TON_POUND=5
CONVERT_TON_OUNCE=6
CONVERT_TON_KILOGRAMS=7
QUIT_CHOICE=8

    # Main Function
def main():
    choice=0

    while choice != QUIT_CHOICE:
       display_menu()
       choice=int(input('Enter your choice:'))

       #Perform menu choice
       if choice == CONVERT_KILOGRAMS_OUNCE:
          kilo=float(input("Enter weight in Kilograms:"))
          print('The weight in ounces is:', KilogramConversion.ounce(kilo))
       elif choice == CONVERT_KILOGRAMS_POUND:
          kilo=float(input("Enter weight in Kilograms:"))
          print('The weight in pounds is:', KilogramConversion.pound(kilo))
       elif choice == CONVERT_POUND_OUNCE:
          lbs=float(input("Enter weight in Pounds:"))
          print('The weight in ounces is:', PoundConversion.ounce(lbs))
       elif choice == CONVERT_POUND_TON:
          lbs=float(input("Enter weight in Pounds:"))
          print('The weight in tons is:', PoundConversion.ton(lbs))
       elif choice == CONVERT_TON_POUND:
          tons= float(input("Enter weight in Tons:"))
          print('The weight in pounds is:', TonConversion.pound(tons))
       elif choice == CONVERT_TON_OUNCE:
          tons= float(input("Enter weight in Tons:"))
          print('The weight in ounces is:', TonConversion.ounce(tons))
       elif choice == CONVERT_TON_KILOGRAMS:
          tons= float(input("Enter weight in Tons:"))
          print('The weight in kilograms is:', TonConversion.kilogram(tons))
       elif choice == QUIT_CHOICE:
           print('Exiting...')
       else:
           print('Invalid Selection')

def display_menu():
    print('          ')
    print('          ')
    print('          Menu')
    print('1. Kilograms to Ounce')
    print('2. Kilograms to Pound')
    print('3. Pound to Ounce')
    print('4. Pound to Ton')
    print('5. Ton to Pound')
    print('6. Ton to Ounce')
    print('7. Ton to Kilograms')
    print('8. Quit')

main()

带有显示菜单的 python 程序中的语法错误

Syntax Error in in a python program with a displayed menu

python

menu

syntax-error