在 Python 中设置按钮的位置？

Question

I just wrote a code that creates a window (using TKinter) and displays one working button.

b = Button(master, text="get", width=10, command=callback)

But i would like to have multiple buttons underneath this one.

How do you set the row and column of the button? I tried to add row = 0, column = 0, but that would not work.

Thanks

Answer 1

Causing a widget to appear requires that you position it using with what Tkinter calls "geometry managers". The three managers are grid , pack and place . Each has strengths and weaknesses. These three managers are implemented as methods on all widgets.

grid , as its name implies, is perfect for laying widgets in a grid. You can specify rows and columns, row and column spans, padding, etc.

Example:

b = Button(...)
b.grid(row=2, column=3, columnspan=2)

pack uses a box metaphor, letting you "pack" widgets along one of the sides of a container. pack is extremely good at all-vertical or all-horizontal layouts. Toolbars, for example, where widgets are aligned in a horizontal line, are a good place to use pack.

Example:

b = Button(...)
b.pack(side="top", fill='both', expand=True, padx=4, pady=4)`

place is the least used geometry manager. With place you specify the exact x/y location and exact width/height for a widget. It has some nice features such as being able to use either absolute or relative coordinates (for example: you can place a widget at 10,10, or at 50% of the widgets width or height).

Unlike grid and pack , using place does not cause the parent widget to expand or collapse to fit all of the widgets that have been placed inside.

Example:

b = Button(...)
b.place(relx=.5, rely=.5, anchor="c")

With those three geometry managers you can do just about any type of layout you can imagine.

Answer 2

astynax is right. To follow the example you gave:

MyButton1 = Button(master, text="BUTTON1", width=10, command=callback)
MyButton1.grid(row=0, column=0)

MyButton2 = Button(master, text="BUTTON2", width=10, command=callback)
MyButton2.grid(row=1, column=0)

MyButton3 = Button(master, text="BUTTON3", width=10, command=callback)
MyButton3.grid(row=2, column=0)

Should create 3 row of buttons. Using grid is a lot better than using pack. However, if you use grid on one button and pack on another it will not work and you will get an error.

Answer 3

Try Grid Geometry Manager :

btns = [
    (lambda ctl: ctl.grid(row=r, column=c) or ctl)(
        Button(text=str(1 + r * 3 + c)))
    for c in (0,1,2) for r in (0,1,2)]

result:

[1][2][3]
[4][5][6]
[7][8][9]