tkinter 从表中乘以价格

Question

我正在为咖啡馆管理系统制作一个简单的程序，它将食物名称作为按钮从桌子上读取，我还想从桌子上读取食物价格并将其乘以按钮点击次数，然后将它们保存到Text我该怎么做呢

this is the image that show where are the two main isues are

from tkinter import *
from tkinter import ttk
import sqlite3
import time
import datetime
import random


variable = 1
bttn_clicks=0
button_dict = {}
button_dic = {}
conn = sqlite3.connect('hoteldb.db')
c = conn.cursor()

def showqurec():
   global button,data2
   data2 = readqurec()
   for index, dat in enumerate(data2):
     button= ttk.Button(master, text=dat[0],command=lambda dat=dat:update_count(dat))
     button.grid(row=index+1, column=0,padx=0, pady=0)
     button_dict[dat] = button

def showqado():
    global button,data2
    data2 = readqado()
    for index, dat in enumerate(data2):
        button = ttk.Button(master, text=dat[0],command=lambda dat=dat: update_count(dat))
        button.grid(row=index+1, column=1,pady=0,padx=0)
        button_dict[dat] = button


def showcasho():
   global button,data2
   data2 = readcasho()
   for index, dat in enumerate(data2):
        button=ttk.Button(master, text=dat[0],command=lambda dat=dat:update_count(dat))
       button.grid(row=index+1, column=2,padx=0, pady=0)
       button_dict[dat] = button



def readfromdatabase():
   cur.execute("SELECT qureec.name,qado.name,casho.name FROM qureec,qado,casho")
   return cur.fetchall()
def readqurec():
   cur.execute("SELECT name FROM qureec ")
   return cur.fetchall()

def readqado():
    cur.execute("SELECT name FROM qado ")
    return cur.fetchall()

def readcasho():
    cur.execute("SELECT name FROM casho ")
    return cur.fetchall()


def update_count(x):
    global bttn_clicks,my_text,price
    my_text=StringVar()
    for name in data2:
        my_text = button_dict[x].cget('text')
    bttn_clicks += 1



def Receipt():
   txtReceipt.delete("1.0", "4.0")
   x = random.randint(10908, 500876)
   randomRef = str(x)
   Receipt_Ref.set("BILL" + randomRef)



   txtReceipt.insert("1.0", 'Receipt Ref: \t\t\t'+Receipt_Ref.get()+"\t\t"+DateofOrder.get()+"\n")
   txtReceipt.insert("2.0", 'Items\t\t'+'Quantity\t\t\t'+"Price \n\n")
   if variable !=0:
       txtReceipt.insert(END, str(my_text)+'\t\t'+str(bttn_clicks)+'\t\t\t'+""+str(bttn_clicks*3)+"\n")










master=Tk()
master.geometry('630x350+100+200')
master.title('Records')
Label = Button(master, text="meal", width=10,command=showqurec)
Label.grid(row=0, column=0)

BMILabel = Button(master, text="tea", width=10,command=showqado)
BMILabel.grid(row=0, column=1)

stateLabel = Button(master, text="fast food", width=10,command=showcasho)
stateLabel.grid(row=0, column=2)

lblReceipt = Button(master,text="Get Receipt:",anchor='w',command=Receipt)
lblReceipt.grid(row=0,column=4,sticky=W)
txtReceipt = Text(master,bg="white",width=47,height=17.5)
txtReceipt.grid(row=1,column=4,rowspan=4,columnspan=40)

Receipt_Ref=StringVar()
DateofOrder = StringVar()
master.mainloop()

现在我宣布了价格，但我如何从数据库中获取它们 我还有另一个按钮点击在每个按钮上都增加了点击指定按钮的方式

Answer 1

在按钮上获取名称，而不仅仅是第一个字母，您必须将名称设置为整个字符串，而不仅仅是第一个位置：

button = ttk.Button(master, text=dat, command ...
                     (instead of dat[0])

每个类别：膳食、茶和快餐。

我不清楚您希望它最终如何工作。您是希望为每个产品更新收据还是仅在最后更新收据。函数update_count() 看起来很奇怪。

我建议使用字典来存储产品和价格。这将使价格查询变得容易。只要应用程序相当小，我认为全局变量将是可取的。

products = {'Soup': 2.40, 'Fish': 3.10, 'Beef': 3.55, 'Pizza': 2.70}

查看下面的示例代码，尝试运行它并考虑您希望其余部分如何工作。每次按下按钮时都应该更新收据吗？是否应该以任何方式订购收据？如果你想从收据中删除一些东西怎么办？

from tkinter import *
from tkinter import ttk
#import sqlite3
import time
import datetime
import random

variable = 1
bttn_clicks=0
button_dict = {}
button_dic = {}
#conn = sqlite3.connect('hoteldb.db')
#c = conn.cursor()
products = {}   # Dictionary of products and prices
tally = []      # List of ordered products

def showqurec():
    global button, data2
    data2 = readqurec()
    for index, dat in enumerate(data2):
        button = ttk.Button(master, text=dat, command=lambda dat=dat: update_count(dat))
        button.grid(row=index+1, column=0, padx=0, pady=0)
        button_dict[dat] = button

def showqado():
    global button, data2
    data2 = readqado()
    for index, dat in enumerate(data2):
        button = ttk.Button(master, text=dat, command=lambda dat=dat: update_count(dat))
        button.grid(row=index+1, column=1, pady=0, padx=0)
        button_dict[dat] = button

def showcasho():
    global button, data2
    data2 = readcasho()
    for index, dat in enumerate(data2):
        button = ttk.Button(master, text=dat, command=lambda dat=dat: update_count(dat))
        button.grid(row=index+1, column=2,padx=0, pady=0)
        button_dict[dat] = button

def readfromdatabase(): # This function is never called...
    return None     
def readqurec():    # Get Meal from database
    meal = {'Soup': 2.40, 'Fish': 3.10, 'Beef': 3.55, 'Pizza': 2.70}
    products.update(meal)
    return meal
def readqado():     # Get Tea from database
    tea = {'Tea': 1.20, 'Coffee': 1.00, 'Soda': 1.65}
    products.update(tea)
    return tea
def readcasho():    # Get Fast food from database
    fast_food = {'Hamburger': 1.80,'Hot dog': 1.45,'Pasta': 1.65}
    products.update(fast_food)
    return fast_food

def update_count(x):
    global bttn_clicks,my_text,price
    purchase = [x,products[x]]  # Get the product and price
    tally.append(purchase)      # Add this purchase to the tally
    print(purchase)
    # Leaving the rest of the function as is ...
    my_text=StringVar()
    for name in data2:
        my_text = button_dict[x].cget('text')
    bttn_clicks += 1

def Receipt():
   txtReceipt.delete("1.0", "4.0")
   x = random.randint(10908, 500876)
   randomRef = str(x)
   Receipt_Ref.set("BILL" + randomRef)

   txtReceipt.insert("1.0", 'Receipt Ref: \t\t\t'+Receipt_Ref.get()+"\t\t"+DateofOrder.get()+"\n")
   txtReceipt.insert("2.0", 'Items\t\t'+'Quantity\t\t\t'+"Price \n\n")
   if variable !=0:
       txtReceipt.insert(END, str(my_text)+'\t\t'+str(bttn_clicks)+'\t\t\t'+""+str(bttn_clicks*3)+"\n")


master=Tk()
master.geometry('630x350+100+200')
master.title('Records')
Label = Button(master, text="meal", width=10,command=showqurec)
Label.grid(row=0, column=0)

BMILabel = Button(master, text="tea", width=10,command=showqado)
BMILabel.grid(row=0, column=1)

stateLabel = Button(master, text="fast food", width=10,command=showcasho)
stateLabel.grid(row=0, column=2)

lblReceipt = Button(master,text="Get Receipt:",anchor='w',command=Receipt)
lblReceipt.grid(row=0,column=4,sticky=W)

txtReceipt = Text(master,bg="white",width=47,height=17.5)
txtReceipt.grid(row=1,column=4,rowspan=4,columnspan=40)

Receipt_Ref=StringVar()
DateofOrder = StringVar()

master.mainloop()