Tkinter中StringVar.get()与Entry.get()的区别及绑定场景用法对比

Let's break down your questions clearly—this is a common point of confusion when working with Tkinter's widgets and variable classes, so it's great you're digging into the details!

1. General Differences Between StringVar.get() and Entry.get() #

First, let's cover what each method does at a core level:

• StringVar.get(): Pulls the value stored in a Tkinter StringVar object. This is a special tracked variable built to share data across multiple widgets (for example, an Entry, Label, and Checkbutton can all bind to the same StringVar and stay perfectly in sync). It works completely independently of any widget—you could create a StringVar, set its value with sv.set("Hi there"), and call sv.get() even if it’s never attached to any GUI element.
• Entry.get(): Fetches the text currently displayed directly in the Entry widget itself. This method is specific to the Entry; you don’t need a StringVar to use it. If your Entry isn’t bound to a variable, this is the only way to grab its content.

2. Usage Differences When Entry is Bound to StringVar #

For your code snippet:

sv = StringVar()
ent = Entry(textvariable=sv)

Tkinter sets up a two-way automatic sync between the StringVar and the Entry:

• Type into the Entry, and sv’s value updates instantly.
• Call sv.set("Updated text"), and the Entry’s displayed text changes right away.

In this scenario:

• Most of the time, sv.get() and ent.get() will return exactly the same value—they’re just two paths to access the synchronized data.
• The only real difference is intent:
  • Use sv.get() if you’re working with the shared variable (e.g., if this StringVar is also bound to a Label, and you want to reference the single "source of truth" for the value).
  • Use ent.get() if you specifically need to target that exact Entry widget (though in practice, it will match sv.get() here).

One tiny edge case to note: If you directly modify the Entry’s content with widget-specific methods like ent.insert() or ent.delete(), the StringVar will still update automatically—so sv.get() will reflect the change immediately, just like ent.get().

内容的提问来源于stack exchange，提问作者عبدالرحمن عبدالصبور