Mac环境下使用tkinter的mainloop()时窗口关闭问题求助

Hey there! Let's break down why your Tkinter window is closing right away and how to fix it:

1. Fix the Critical Typo in Your Code #

First off, there's a spelling mistake in your requests handling that's causing your program to crash before the Tkinter window even gets a chance to show up:

• You wrote a.enconding = a.apparent_encoding — it should be a.encoding (missing one 'c').
• This typo throws an AttributeError, which stops the entire script dead in its tracks.

Also, your regex uses < (HTML escape for <), which won't match the actual < characters in the webpage source. Swap that out for a literal < to make your regex work properly.

Here's your corrected code to test:

import requests
import re
import tkinter as tk

url = 'http://www.qmaile.com/'
a = requests.get(url)
a.encoding = a.apparent_encoding  # Fixed spelling
b = a.text
reg = re.compile('<option value="(.*?)" selected="">')  # Use literal < instead of &lt;
res = re.findall(reg, b)

root = tk.Tk()
root.title("My First Tkinter Window")  # Added a title to make it easy to spot
root.mainloop()

2. Adjust Spyder's Graphics Backend Setting #

Spyder's default IPython console settings can sometimes interfere with Tkinter's main loop. Here's how to tweak it:

• Open Spyder, go to Tools → Preferences
• Navigate to IPython console → Graphics
• Change the Backend dropdown from Automatic to Tkinter
• Click Apply → OK, then restart Spyder

This ensures Spyder uses Tkinter's native backend to render your GUI window, preventing it from closing prematurely.

3. Quick Debugging Trick (If Needed) #

If you still run into issues, you can add a prompt after the main loop to keep the script alive (though this shouldn't be necessary if the above fixes work):

root.mainloop()
input("Press Enter to close the program...")

Give these steps a try — your Tkinter window should stay open as expected!

内容的提问来源于stack exchange，提问作者fyddward