Python -打开文本编辑器并实时查看更新

Question

我的程序的目的是在文本编辑器中记录按键，并用计时器实时显示。其功能类似于手动打开文本编辑器并键入，从而提供即时反馈。

下面的代码将按键记录到文本编辑器中，但只有在程序完成后才会显示输出。如何打开txt文件并实时显示按键和计时器值？

from tkinter import *
import time

import keyboard

root = Tk()
root.title('quick_data')

session_duration = IntVar()

def startSession():
    f = open("quick_data.txt", "a")
    for remaining in range(1, int(session_duration.get() + 1), +1):
        if (keyboard.is_pressed("a")):
            r = "{:2d} s".format(remaining) + " --> response 1"
        elif (keyboard.is_pressed("b")):
            r = "{:2d} s".format(remaining) + " --> response 2"
        else:
            r = "{:2d} s".format(remaining)
        f.write(r)
        f.write("\n")
        f.flush()
        time.sleep(1)

Label(root, text="Session duration").grid(row=1, sticky=W)
Entry(root, textvariable = session_duration).grid(row=1, column=1, sticky=E)

WSignUp = Button(root, text="Start Session", command=startSession).grid(row=3, column=0, sticky=W)
root.mainloop()

Answer 1

您可以使用widget Text并直接写入widget。

当你在循环中运行代码时，它会阻塞tkinter。它等待函数结束后更新窗口中的内容。您需要使用root.update()来强制tkinter更新window中的内容。

from tkinter import *
import time
import keyboard

# --- functions ---  # PEP8: `lower_case_names` for functions

def start_session():
    
    for remaining in range(1, session_duration.get()+1, 1):
        
        if (keyboard.is_pressed("a")):
            r = "{:2d} s".format(remaining) + " --> response 1"
        elif (keyboard.is_pressed("b")):
            r = "{:2d} s".format(remaining) + " --> response 2"
        else:
            r = "{:2d} s".format(remaining)
            
        text.insert('end', r + '\n')
        root.update()
        
        time.sleep(1)

# --- main ---

root = Tk()
root.title('quick_data')

session_duration = IntVar(value=5)

Label(root, text="Session duration").grid(row=1, sticky=W)
Entry(root, textvariable = session_duration).grid(row=1, column=1, sticky=E)

WSignUp = Button(root, text="Start Session", command=start_session).grid(row=3, column=0, sticky=W)

text = Text(root)
text.grid(row=4, column=0, columnspan=2)

root.mainloop()