问题描述
我对 python 非常陌生，我一直在尝试执行此代码，其中我使用 tkinter 按钮命令运行一个函数，它可以工作但 append() 没有执行，这意味着它不会附加到列表中.
I am very new to python and I've been trying to do this code where i use a tkinter button command to run a function, it works but the append() is not executing, meaning it does not append to the list.
列表和包含append的函数在类外，然后通过使用tkinter按钮命令在类内进行分类
The list and the function containing the append is outside the class and is then classed within a class through the use of tkinter button command
我已经尝试将函数放入类中，它可以工作，但附加不会再次添加到列表中.
I've tried putting the function inside the class, it works but the append is not adding into the list again.
import tkinter as tk
from threading import Thread
from queue import Queue
import time
from tkinter import messagebox
LARGE_FONT = ("Verdana", 12)
Receipt = []
prices = []
job_queue = Queue()
Orders = []
class SushiMenuApp(tk.Tk):
def __init__(self, *args, **kwargs):
tk.Tk.__init__(self, *args, **kwargs)
container = tk.Frame(self)
container.pack(side="top", fill="both", expand=True)
container.grid_rowconfigure(0, weight=1)
container.grid_columnconfigure(0, weight=1)
self.frames = {}
for F in (OrderPage, ReceiptPage):
frame = F(container, self)
self.frames[F] = frame
frame.grid(row=0, column=0, sticky="nsew")
self.show_frame(OrderPage)
def show_frame(self, cont):
frame = self.frames[cont]
frame.tkraise()
def sushichef(job_queue):
while True:
a = job_queue.get()
if a is None:
print("There are no more orders")
break
messagebox.showinfo("Message", "Sushi Chef started doing you order")
time.sleep(a)
print("Your order will be coming to you now")
job_queue.task_done()
class OrderPage(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
label = tk.Label(self, text="Sushi Selections", font=LARGE_FONT)
label.grid(row=0, column=0, columnspan=4)
checkout = tk.Button(self, text="Check Out", command=lambda:controller.show_frame(ReceiptPage))
checkout.grid(row=0, column=4)
for _ in range(4): # 4 Sushi Chefs
thread = Thread(target=sushichef, args=(job_queue,))
thread.start()
Orders.append(thread)
shrimptempura = tk.Button(self, text="Shrimp Tempura",
command= staction)
shrimptempura.grid(row=1, column=0)
def staction():
for item in [60]:
job_queue.put(item)
prices.append(69)
Receipt.append("Shrimp Tempura")
class ReceiptPage(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
label = tk.Label(self, text="Receipt", font=LARGE_FONT)
label.grid(row=0, columnspan=4, sticky="nsew")
fullreceipt= tk.Label(self, text='\n'.join(map(str, Receipt)))
fullreceipt.grid(row=1, columnspan=4, rowspan=48)
sumprice= tk.Label(self, text=sum(prices))
sumprice.grid(row=49, column=1, columnspan=2)
app = SushiMenuApp()
app.mainloop()
我期望输出将价格中的值和收据.append() 中的字符串与 job_queue 一起添加，
I was expecting the output to add the value within the prices.append() and the string within the receipt.append() together along with the job_queue,
期望在收据页面中看起来像这样
expected would be that in the receipt page it would look something like this
Receipt
Shrimp Tempura
70
但输出是只有 job_queue 是我可以看到的工作，因为消息框正在工作，这是 job_queue 的效果，但在 ReceiptPage 中它只会显示
but the output is that only the job_queue is what i can see as working because the message box was working which was the effect of the job_queue but in the ReceiptPage it would only show
Receipt
推荐答案
Frame ReceiptPage 是在开始时创建的，在你按下任何按钮甚至看到窗口之前，所以 Labels从空列表中获取信息.您必须在 ReceiptPage 中添加更新 Labels 的功能，并在您取消 Check Out
Frame ReceiptPage is create at start, before you press any button or even see window, so Labels get information from empty lists. You have to add function which updates Labels in ReceiptPage and execute it when you pless Check Out
您还必须将 self. 用于标签，以便您可以访问其他功能中的标签.
You will have to also use self. for labels so you have access to labels in other functions.
ReceiptPage 具有更新标签的功能.标签使用self.
ReceiptPage has function which update labels. Labels uses self.
class ReceiptPage(tk.Frame):
def update_labels(self):
self.fullreceipt['text'] = '\n'.join(map(str, Receipt))
self.sumprice['text'] = sum(prices)
OrderPage 具有改变页面和运行update_labels 的功能.controler 也使用 self.
OrderPage has function which change page and run update_labels. controler also uses self.
def show_check_out(self):
self.controller.show_frame(ReceiptPage)
self.controller.frames[ReceiptPage].update_labels()
和按钮执行此功能
checkout = tk.Button(self, text="Check Out", command=self.show_check_out)
完整代码:
Full code:
import tkinter as tk
from threading import Thread
from queue import Queue
import time
from tkinter import messagebox
LARGE_FONT = ("Verdana", 12)
Receipt = []
prices = []
job_queue = Queue()
Orders = []
class SushiMenuApp(tk.Tk):
def __init__(self, *args, **kwargs):
tk.Tk.__init__(self, *args, **kwargs)
container = tk.Frame(self)
container.pack(side="top", fill="both", expand=True)
container.grid_rowconfigure(0, weight=1)
container.grid_columnconfigure(0, weight=1)
self.frames = {}
for F in (OrderPage, ReceiptPage):
frame = F(container, self)
self.frames[F] = frame
frame.grid(row=0, column=0, sticky="nsew")
self.show_frame(OrderPage)
def show_frame(self, cont):
frame = self.frames[cont]
frame.tkraise()
def sushichef(job_queue):
while True:
a = job_queue.get()
if a is None:
print("There are no more orders")
break
messagebox.showinfo("Message", "Sushi Chef started doing you order")
time.sleep(a)
print("Your order will be coming to you now")
job_queue.task_done()
class OrderPage(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
self.controller = controller
label = tk.Label(self, text="Sushi Selections", font=LARGE_FONT)
label.grid(row=0, column=0, columnspan=4)
checkout = tk.Button(self, text="Check Out", command=self.show_check_out)
checkout.grid(row=0, column=4)
for _ in range(4): # 4 Sushi Chefs
thread = Thread(target=sushichef, args=(job_queue,))
thread.start()
Orders.append(thread)
shrimptempura = tk.Button(self, text="Shrimp Tempura", command=staction)
shrimptempura.grid(row=1, column=0)
def show_check_out(self):
self.controller.show_frame(ReceiptPage)
self.controller.frames[ReceiptPage].update_labels()
def staction():
for item in [6]:
job_queue.put(item)
prices.append(69)
Receipt.append("Shrimp Tempura")
class ReceiptPage(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
self.label = tk.Label(self, text="Receipt", font=LARGE_FONT)
self.label.grid(row=0, columnspan=4, sticky="nsew")
self.fullreceipt= tk.Label(self, text='\n'.join(map(str, Receipt)))
self.fullreceipt.grid(row=1, columnspan=4, rowspan=48)
self.sumprice= tk.Label(self, text=sum(prices))
self.sumprice.grid(row=49, column=1, columnspan=2)
def update_labels(self):
self.fullreceipt['text'] = '\n'.join(map(str, Receipt))
self.sumprice['text'] = sum(prices)
app = SushiMenuApp()
app.mainloop()
为了让它更通用，你可以在每个框架函数中创建update_frame(甚至是空函数)，然后你可以在show_frame
To make it more universal you can create in every frame function update_frame (even empty function) and then you can execute it in show_frame
def show_frame(self, cont):
frame = self.frames[cont]
frame.tkraise()
frame.update_frame()
不要使用名称 update() 因为它被 tkinter 使用.
这篇关于python:将值附加到类外的列表中，在类外也有附加的函数，但在类内调用函数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！