输入文本选项:好奇行为 [英] Entry text option: curious behavior

问题描述

考虑以下代码:

import  tkinter as tk

FONT="Arial 20 bold"

app = tk.Tk()

tk.Entry(app,text="hi", font=FONT).pack()
tk.Entry(app,text="hi", font=FONT).pack()

app.mainloop()

此动画显示，文本内容相互关联:一个条目的更改会自动更新另一个条目.请注意，文本选项不绑定到任何 stringVar 对象，而是绑定到字符串文字.

This animation shows, that the text contents are connected one to the other: change in one entry automatically updates the other one. Notice that text options are not bounded to any stringVar object but to a string literal.

奇怪的是，如果文本选项被初始化为不同的文字字符串，例如hi and Hi"，条目内容变得不相关.

Curiously, if text options are initialized to distinct litteral string, for instance "hi and Hi", entry contents become unrelated.

这是预期的行为吗?

在三个条目中，两个具有相同文本的条目也链接在一起:

With three entries, the two that have the same text are also linked:

import  tkinter as tk

FONT="Arial 20 bold"

app = tk.Tk()

tk.Entry(app, text="hi", font=FONT).pack()
tk.Entry(app, text="there", font=FONT).pack()
tk.Entry(app, text="hi", font=FONT).pack()

app.mainloop()

即使这些条目被分配给不同的变量:

Even if these entries are assigned to distinct variables:

import  tkinter as tk

FONT="Arial 20 bold"

app = tk.Tk()

a = tk.Entry(app, text="hi", font=FONT).pack()
b = tk.Entry(app, text="there", font=FONT).pack()
c = tk.Entry(app, text="hi", font=FONT).pack()

app.mainloop()

推荐答案

问题实际上出在 text 参数上.通过传递 text，您正在创建 Entry 小部件的 textvariable:

The problem lies with the text parameter actually. By passing text you are creating a textvariable of the Entry widget:

import tkinter as tk

FONT="Arial 20 bold"

app = tk.Tk()

a = tk.Entry(app, text="hi", font=FONT)
b = tk.Entry(app, text="there", font=FONT)
c = tk.Entry(app, text="hi", font=FONT)

for i in (a,b,c):
    i.pack()
    print (i["textvariable"])

app.mainloop()

要解决此问题 - 只需不要将 text 作为参数传递.我认为无论如何你都不需要它.

To fix this problem - simply don't pass text as a parameter. I don't think you need it anyways.

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