Question

我正在研究这个问题：编写一个Python程序，允许用户从餐馆的菜单中订购商品。

GUI应该允许客户输入他或她的名字电话号码。
系统必须生成一个随机数来表示订单号。
应允许客户选择：（1）沙拉菜单中的任何项目，（2）任何一个入门菜单，（3）任何一门主要课程
当用户点击订单按钮时，程序应显示客户详细信息（姓名和电话号码）以及订单的详细信息基于他或她的选择。
应该有一个字段显示订单的总金额。

6。信息，即订单号和总金额成功交易后，必须将订单写入文本文件。注意不要在文本文件中覆盖以前的信息。

我的程序工作正常，但我不知道怎么做子弹6.哪个是将订单号广告总金额写入文本文件而不会覆盖。

这是我的代码：＃创建一个菜单程序

 import random

 from Tkinter import *

 class App(Frame):
 #GUI application
  def __init__(self,master):
    Frame.__init__(self,master)
    self.grid()
    self.create_widgets()

  def create_widgets(self):
    #Label to welcome the user
    Label(self, text="Welcome to Costa's restaurant menu"
          ).grid(row=0, column=0, sticky=W)

    #Label to request the name of the customer
    Label(self, text="Customer Name: "
          ).grid(row=1, column=0, sticky=W)
    self.ent_cust = Entry(self)
    self.ent_cust.grid(row=1, column=1, sticky=W)

    #Label to request the telephone number:
    Label(self, text="Telephone number: "
          ).grid(row=1, column=2, sticky=W)
    self.ent_tel = Entry(self)
    self.ent_tel.grid(row=1, column=3, sticky=W)

    #Label to generate a random order number
    rnd = (int(random.randrange(50)) + 1)
    Label(self, text=("Your order number    " + str(rnd))).grid(row=0, column=2, sticky=W)
    n = 4
    #MENU items to choose from
    #the salads

    Label(self, text="Select any items from the salad menu: @R30").grid(row=n, column=0, sticky=W)
    self.has_greensalad = BooleanVar()

    # the green salad
    Checkbutton(self, text="Special mixed green salad"
                , variable=self.has_greensalad).grid(row=(n + 1), column=0, sticky=W)
    #the blue cheese salad
    self.has_bluecheese = BooleanVar()
    Checkbutton(self, text="Blue cheese salad"
                , variable=self.has_bluecheese).grid(row=(n + 1), column=1, sticky=W)
    #the greek salad
    self.has_greek = BooleanVar()
    Checkbutton(self, text="Greek salad"
                , variable=self.has_greek).grid(row=(n + 1), column=2, sticky=W)
    #the starters
    z = (n + 2)
    Label(self, text="Select any one of the starter menu: @60:"
          ).grid(row=z, column=0, sticky=W)
    #the oysters
    self.startermenu = StringVar()
    Radiobutton(self, text="6 oysters",
                variable=self.startermenu, value="6 oysters"
                ).grid(row=(z + 1), column=0, sticky=W)
    #the prawns
    Radiobutton(self, text="Prawns",
                variable=self.startermenu, value="Prawns"
                ).grid(row=(z + 1), column=1, sticky=W)
    #chicken wings
    Radiobutton(self, text="Chicken wings",
                variable=self.startermenu, value="Chicken wings"
                ).grid(row=(z + 1), column=2, sticky=W)
    #main course
    x = (z + 3)
    Label(self, text="Select any one of the main menu @ R150"
          ).grid(row=x, column=0, sticky=W)
    self.maincourse = StringVar()
    main_courses = ["Hamburger with chips", "Lasagne","Pasta Carbonara","Risotto alla milanese"]
    column = 0
    for main in main_courses:
        Radiobutton(self,
                    text = main,
                    variable=self.maincourse,
                    value = main
                    ).grid(row=(x + 1), column=column, sticky=W)
        column += 1
    q = (x + 5)
    Button(self, text='Place the Order', command=self.determine_order).grid(row=q, column=1, sticky=W)
    self.txt_order = Text(self, width=75, height=10, wrap=WORD)
    self.txt_order.grid(row=(q + 1), column=0, columnspan=4)
    Label(self, text="Total:  R",
         ).grid(row=(q + 11)
                , column=0, sticky=W)
    self.txt_total = Text(self, width=8, height=1, wrap=NONE)
    self.txt_total.grid(row=(q + 11), column=0)

 def determine_order(self):
    """ Fill text box with order based on user input. """
    totalprice = 0
    salads = 30
    starters = 60
    mainmenu = 150
    name = self.ent_cust.get()
    tel = self.ent_tel.get()
    salads = ""
    if self.has_greensalad.get():
        salads += "Special mixed Green Salad\n"
        totalprice = (totalprice + starters)
    if self.has_bluecheese.get():
        salads += "Blue cheese salad\n"
        totalprice = (totalprice + starters)
    if self.has_greek.get():
        salads += "Greek Salad\n"
        totalprice = (totalprice + starters)
    if (salads == ""):
        salads = "No salads ordered\n"
        totalprice = (totalprice + 0)
    startermenu = self.startermenu.get()
    if (len(startermenu) == 0):
        startermenu = "You didn't order a starter"
    else:
        totalprice = (totalprice + starters)
    maincourse = self.maincourse.get()
    if (len(maincourse) == 0):
        maincourse = "You didn't order a main course"
    else:
        totalprice = (totalprice + mainmenu)
    order = ((((((((name + " (") + tel) + ") ordered from the salad menu:\n") + salads) + "\nFrom the starters menu:\n ") + startermenu) + "\n\nFrom the main menu:\n") + maincourse)
    self.txt_order.delete(0.0, END)
    self.txt_order.insert(0.0, order)
    self.txt_total.delete(0.0, END)
    self.txt_total.insert(0.0, float(totalprice))


def main():
 root = Tk()
 root.title("Costa's Restaurant Menu")
 app = App(root)
 root.mainloop()    



main()

Answer 1

使用open模式＆＃34; a＆＃34;附加数据。使用模式＆＃34; w＆＃34;将覆盖现有数据。

with open('myfile', mode='a') as fp:
    fp.write('data')

使用Python编写文本文件

1 个答案: