Python EasyGUI multchoicebox多选项IF判断逻辑失效求助

Let's break down why your code isn't triggering the "Correct!" message, then fix it properly.

The Core Problem #

First, you need to remember that easygui.multchoicebox() returns a list of selected options, not a single string. For example, if the user picks "Correct" and "Also Correct", choice will be something like ["Correct", "Also Correct"] (the order might vary based on how the user clicks).

Your original condition has two big issues:

1. You're comparing a list (choice) directly to a single string (fieldnames[1]), which will never be true.
2. The and fieldnames[2] part doesn't check if that option is selected—since fieldnames[2] is a non-empty string, it always evaluates to True in a boolean check. So your condition effectively becomes False and True, which is always False.

The same problem applies to your second attempt: comparing a list to a string will never work, and and "Also Correct" doesn't validate that the option is actually selected.

Fixes for Different Scenarios #

We'll cover two common use cases—pick the one that matches your needs.

Scenario 1: User must select exactly "Correct" and "Also Correct" (no more, no less)

Use a set comparison to ignore the order of selections (since users might click the options in any order):

import easygui

fieldnames = ["Incorrect", "Correct", "Also Correct"]
choice = easygui.multchoicebox("Pick an option.", "", fieldnames)

# Handle the case where the user clicks "Cancel" (returns None)
if choice is not None and set(choice) == {"Correct", "Also Correct"}:
    easygui.msgbox('Correct!')
else:
    easygui.msgbox('Incorrect')

Scenario 2: User just needs to select both "Correct" and "Also Correct" (can select other options too)

Check if both options are present in the selected list:

import easygui

fieldnames = ["Incorrect", "Correct", "Also Correct"]
choice = easygui.multchoicebox("Pick an option.", "", fieldnames)

if choice is not None and "Correct" in choice and "Also Correct" in choice:
    easygui.msgbox('Correct!')
else:
    easygui.msgbox('Incorrect')

Extra Note #

We added choice is not None to handle cases where the user clicks the "Cancel" button in the multchoicebox—this prevents a TypeError if you try to check membership or convert None to a set.

内容的提问来源于stack exchange，提问作者John Collins