tkinter pack() method not working for one label-CodePudding

import tkinter as tk

win = tk.Tk()
win.title('使用者登入')
win.geometry('300x200')

lb1 = tk.Label(win,text='使用者帳號資料',font=('微軟正黑體',16),fg='yellow',bg='black')
lb1.pack(fill='x')

lb2 = tk.Label(win,text='帳號 : ABCDEF',height=4,width=26,font=('標楷體',14),bg='lightblue')
lb2.pack(side='left',anchor='nw',fill='x')

lb3 = tk.Label(win,text='注意',height=50,width=3,font=('微軟正黑體',12),bg='pink')
lb3.pack(anchor='se',fill='y',expand=True)

lb4 = tk.Label(win,text='密碼 : 123456',height=4,width=15,font=('標楷體',14),bg='lightgreen')
lb4.pack(anchor='sw',side='left')

win.mainloop()

The variable lb4 could not be shown on the tkinter window even though I have used pack() method. I would like to put the lb4 widget below lb2 and I had tried using anchor='sw' still not showing so any possible methods to have that widget be shown properly?

CodePudding user response：

The pack method works properly, check that:

import tkinter as tk

win = tk.Tk()
win.title('使用者登入')
win.geometry('300x200')

# lb1 = tk.Label(win,text='使用者帳號資料',font=('微軟正黑體',16),fg='yellow',bg='black')
# lb1.pack(fill='x')
#
# lb2 = tk.Label(win,text='帳號 : ABCDEF',height=4,width=26,font=('標楷體',14),bg='lightblue')
# lb2.pack(side='left',anchor='nw',fill='x')
# 
# lb3 = tk.Label(win,text='注意',height=50,width=3,font=('微軟正黑體',12),bg='pink')
# lb3.pack(anchor='se',fill='y',expand=True)

lb4 = tk.Label(win,text='密碼 : 123456',height=4,width=15,font=('標楷體',14),bg='lightgreen')
lb4.pack(anchor='sw',side='left')

win.mainloop()

If it does show anything is because the pack method add widget to the right of the previous on if it's anchored to "S"(outh), even if the new widget it's anchored to 'w' and sided to 'left'.

Since lb3 is anchor at 'se', any other widget is displayed outside the windows.

You shoud use

Here, I removed the height of lb3 since it's not required (sticky 'NS' allow us to extend the widget to top and down of the rowspan). You can change column, row, columnspan, rowspan as you want to create the layout you desire.

CodePudding user response：

I tried running your code and using lb4 before lb3 fixes the problem, but it won't display below lb2 as you have already used side='left' in lb2 so it acquires the whole left side, to pack it below lb2 remove the side='left' in lb2 and put it in lb4.

It doesn't display lb4 at first because it packs it outside of the TKinter window .

Instead of using .pack() use .grid() to better place the labels in the window.

This works:

import tkinter as tk

win = tk.Tk()
win.title('使用者登入')
win.geometry('300x200')

lb1 = tk.Label(win,text='使用者帳號資料',font=('微軟正黑體',16),fg='yellow',bg='black')
lb1.pack(fill='x')

lb2 = tk.Label(win,text='帳號 : ABCDEF',height=4,width=26,font=('標楷體',14),bg='lightblue')
lb2.pack(anchor='nw',fill='x')

lb4 = tk.Label(win,text='密碼 : 123456',height=4,width=15,font=('標楷體',14),bg='lightgreen')
lb4.pack(side='left',anchor='sw')

lb3 = tk.Label(win,text='注意',height=50,width=3,font=('微軟正黑體',12),bg='pink')
lb3.pack(anchor='se',fill='y',expand=True)

win.mainloop()