Question

我是PYTHON和CODING的新手。所以我有一个程序，菜单中有多个功能。单独地，每个功能本身都可以正常工作，但是当我将它们放在一起时，它们通常不能完全执行，而是停止一半或根本不工作。示例 - 函数删除不会删除我告诉它的内容。 def show_coffee只会显示第一个描述和重量，而不会显示任何其他内容。我该怎么做才能使功能完全执行？

import os
def main():
choice =''
fun=[]
while choice != 4:
    menu()
    choice=getUserChoice()
    if choice !=4:
        fun=process_choice(choice,fun)
        print(fun)

print("Goodby!")

def process_choice(choice,fun):
#fun=fun1
if choice == 0:
    fun=add_coffee(fun)
elif choice == 1:
    fun=show_coffee(fun)
elif choice == 2:
    fun=search_coffee(fun)
elif choice == 3:
    fun=modify_coffee(fun)
else:
    print(choice,"is not a valid choice.")
return fun


def add_coffee(fun):
another= 'y'
coffee_file=open('coffee.txt', 'a')
Description={}
while another == 'y' or another == 'Y':
    print('Enter the following coffee data:')
    descr=input('Description: ')
    qty= int(input('Quantity (in pounds): '))
    coffee_file.write(descr + '\n')
    coffee_file.write(str(qty) + '\n')
    print("Do you want to add another record?")
    another = input("Y=yes, anything else =no: ")

    return fun


coffee_file.close()
print('Data append to coffee.txt.')


def show_coffee(fun2):
coffee_file=open ('coffee.txt', 'r')
descr=coffee_file.readline()
while descr != "":

    qty= str(coffee_file.readline())

    descr=descr.rstrip('\n')
    print('Description:', descr)
    print('Quantity:', qty)
    descr= coffee_file.readline()
    fun=fun2
    return fun
coffee_file.close()

def search_coffee(fun3):
found=False
search =input('Enter a description to search for: ')
coffee_file=open('coffee.txt', 'r')
descr=coffee_file.readline()
while descr != '':
    qty= float(coffee_file.readline())
    descr = descr.rstrip('\n')
    if descr== search:
        print('Description:', descr)
        print('Quantity:', qty)
        found=True
    descr=coffee_file.readline()
    fun=fun3
    return fun
coffee_file.close()
if not found:
    print('That item was not found in the file.')




def modify_coffee(fun4):
found=False
search=input('Which coffee do you want to delete? ')
coffee_file=open('coffee.txt', 'r')
temp_file=open('temp.txt', 'w')
descr=coffee_file.readline()
while descr != '':
    qty=float(coffee_file.readline())
    descr=descr.rstrip('\n')
    if descr !=search:
        temp_file.write(descr + '\n')
        temp_file.write(str(qty) + '\n')
    else:
        found=True
    descr=coffee_file.readline()
    fun=fun4
    return fun
coffee_file.close()
temp_file.close()
os.remove('coffee.txt')
os.rename('temp.txt', 'coffee.txt')
if found:
    print('The file has been update.')
else:
    print('The item was not found in the file.')




def menu():
print('''
0. Add or Update an entry
1. Show an entry
2. Search
3. remove
4. Remove number
''')


def getUserChoice():
choice=-1
while choice <0 or choice > 3:
    print("Please select 0-3: ",end='')
    choice=int(input())
return choice

Answer 1

您正在定义函数，但这不会调用函数。在Python中执行此操作的标准方法是使用文件底部的if __name__=="__main__":语句。执行文件时（而不是由另一个脚本导入的函数/类），执行if __name__=="__main__":范围内的代码块。

对此感到满意，这很有用且干净:)好读 - What does if __name__ == "__main__": do?

所以，例如......

在您的文件底部......

if __name__=="__main__":
    main()

完全完成一项功能

1 个答案: