Pythons .grid() 函数如何工作

Question

我尝试使用以下方法来对齐按钮，但它不起作用

#creates entry inputs for answers
entry=Entry(master)
entry.pack()
entry.focus_set() 

#button 1 created and used to call addition function
b1 = Button(master, text="+", command=callback)
b1.pack(side=LEFT)

#button 2 created and used to call subtraction function
b2 = Button(master, text="-", command=callback2)
b2.pack(side=LEFT)

#button 3 created and used to call divison function
b3 = Button(master, text="/", command=callback3)
b3.pack(side=LEFT)

#button 4 created and used to call multiplication function
b4 = Button(master, text="*", command=callback4)
b4.pack(side=LEFT)

#button 5 created and used to check answers
b5 = Button(master, text="Check Ans", width=10, command=callbackinput)
b5.pack(side=LEFT)

编辑我正在尝试让一个条目位于左对齐的四个按钮上方居中

到目前为止我得到的（image）需要对齐按钮上方的条目

同样，当使用 .grid(row= , column=) 时，GUI 不会出现

Answer 1

您的代码中的问题是您同时调用了 grid 和 pack。 Tkinter 有三个几何管理器：这两个，加上 place。一个小部件一次只能由其中一个控制。当您调用多个时，只有最后一个有效。因此，当您调用 pack.

时，调用 grid 的任何效果都将无效

Answer 2

由于您使用 pack 作为您的几何管理器，当您在其中一个按钮上调用 grid 时，tkinter 不知道该怎么做。选择一个几何管理器并在整个 window.

中坚持使用它

from tkinter import *

master = Tk()

# some dummy callback functions
callback, callback2, callback3, callback4, callbackinput = [lambda: None]*5    

#creates entry inputs for answers
entry=Entry(master)
entry.grid(row=0, column=0, columnspan=6)
entry.focus_set() 

#button 1 created and used to call addition function
b1 = Button(master, text="+", command=callback)
b1.grid(row=1, column=0)

#button 2 created and used to call subtraction function
b2 = Button(master, text="-", command=callback2)
b2.grid(row=1, column=1)

#button 3 created and used to call divison function
b3 = Button(master, text="/", command=callback3)
b3.grid(row=1, column=2)

#button 4 created and used to call multiplication function
b4 = Button(master, text="*", command=callback4)
b4.grid(row=1, column=3)

#button 5 created and used to check answers
b5 = Button(master, text="Check Ans", width=10, command=callbackinput)
b5.grid(row=1, column=4, columnspan=2)

创建一个 window 看起来像：

Pythons .grid() 函数如何工作

How does Pythons .grid() function work

python

tkinter

grid-layout