“Gui”对象没有“after”属性

Question

我使用我的tkinter代码（它只绘制窗口/按钮等），并尝试从这里的批准答案中添加一些代码：python code for serial data to print on window.

经过批准的答案本身只需做很小的修改，但是在我的代码中添加了一个错误“'Gui'object has no attribute'after'”

我不明白为什么属性“after”在类Gui中而不是在方法process_serial中查找。 在

from tkinter import *
from tkinter import ttk

import serial
import threading
import queue

class SerialThread(threading.Thread):
    def __init__(self, queue):
        threading.Thread.__init__(self)
        self.queue = queue
    def run(self):
        s = serial.Serial('COM11',115200)
        while True:
            if s.inWaiting():
                text = s.readline(s.inWaiting())
                self.queue.put(text)

class Gui():
    def __init__(self, master):
        ###MAIN FRAME###
        mainFrame = Frame(master, width=50000, height=40000)
        mainFrame.pack(fill = BOTH, expand = 1)

        ###LIST FRAME###
        listFrame = Frame(mainFrame)
        listFrame.pack(side = TOP, fill = BOTH, expand = 1)

        self.sensorList = ttk.Treeview(listFrame)

        self.sensorList["columns"]=("MAC","Type","Value","Voltage","Firmware","Rate","RSSI")
        self.sensorList.column("MAC", width=200, minwidth=200)
        self.sensorList.column("Type", width=100, minwidth=100)
        self.sensorList.column("Value", width=100, minwidth=100)
        self.sensorList.column("Voltage", width=100, minwidth=100)
        self.sensorList.column("Firmware", width=100, minwidth=100)
        self.sensorList.column("Rate", width=100, minwidth=100)
        self.sensorList.column("RSSI", width=100, minwidth=100)
        self.sensorList.heading("MAC", text="MAC")
        self.sensorList.heading("Type", text="Type")
        self.sensorList.heading("Value", text="Value")
        self.sensorList.heading("Voltage", text="Voltage")
        self.sensorList.heading("Firmware", text="Firmware")
        self.sensorList.heading("Rate", text="Rate")
        self.sensorList.heading("RSSI", text="RSSI")

        self.sensorList.pack(fill = BOTH, expand = 1,  pady=5, padx=5)

        ###TEXT AREA FRAME###
        textAreaFrame = Frame(mainFrame)
        textAreaFrame.pack(side = TOP, fill = BOTH, expand = 1)

        self.textArea = Text(textAreaFrame)
        self.textArea.pack(fill = BOTH, expand = 1,  pady=5, padx=5)

        ###INPUT FRAME###
        inputFrame = Frame(mainFrame)
        inputFrame.pack(side = BOTTOM, fill = X, expand = 0)

        self.input = Entry(inputFrame)
        self.input.pack(side=LEFT, fill = X, expand = 1,  pady=5, padx=5)

        self.comboAction = ttk.Combobox(inputFrame)
        self.comboAction.pack(side = LEFT, pady=5, padx=5)

        self.comboDevice = ttk.Combobox(inputFrame)
        self.comboDevice.pack(side = LEFT, pady=5, padx=5)

        self.sendButton = Button(
            inputFrame, text="SEND", command=mainFrame.quit
        )

        self.sendButton.pack(side=LEFT,pady=5, padx=5)

        #self.button = Button(
        #   mainFrame, text="QUIT", fg="red", command=mainFrame.quit
        #)
        #self.button.pack(side=LEFT)

        #self.hi_there = Button(mainFrame, text="Hello", command=self.say_hi)
        #self.hi_there.pack(side=LEFT)

        ###AFFIX MINIMUM SIZE OF MAIN WINDOW TO PREVENT POOR SIZING###
        master.update()
        master.minsize(root.winfo_width(), root.winfo_height())
        master.minsize(master.winfo_width(), master.winfo_height())

        ###SERIAL PORT###
        self.queue = queue.Queue()
        thread = SerialThread(self.queue)
        thread.start()
        self.process_serial()

    def process_serial(self):
        while self.queue.qsize():
            try:
                self.textArea.delete(1.0, 'end')
                self.textArea.insert('end', self.queue.get())
            except Queue.Empty:
                pass
        self.after(100, self.process_serial)



    def say_hi(self):
        s = self.input.get()
        print ("hi there, everyone!" + s)

root = Tk()

gui = Gui(root)

root.mainloop()
root.destroy() # optional; see description below

Answer 1

方法after是从Tkinter.Tk继承的。Check mentioned question

你可能应该子类化Tkinter.Tk.塔卡在

...
import Tkinter
class Gui(Tkinter.Tk)
    ...

Answer 2

罪魁祸首在进程序列函数中的这一行：

self.after(100, self.process_serial)

这里的自变量指的是Gui对象，而不是具有“after”函数的tkinter对象。在

您的代码与链接问题中的代码不匹配。您的类不扩展tkinter对象。答案中的类扩展了tkinter Tk对象，如下所示：

^{pr2}$

从而从Tk类继承函数。在

要解决代码中的这个问题，请用一个tkinter对象替换process_serial函数中的self，例如self.text区域. 在

self.textArea.after(100, self.process_serial)

或者，您可以子类tk.tk.塔卡就像链接的答案一样。但我看不出还有什么好处。在