Develop Reference

How to ensure a new tkinter Toplevel appears on top of all others?

I've looked at the tkinter documentation but am still confused as to how the -topmost option works when multiple Toplevels are open. A simple example:
from tkinter import Tk,Toplevel
root = Tk()
root.wm_title("Main Window")
root.geometry('1400x900')
top_window = Toplevel(root,bg="lightgray")
top_window.geometry('1400x900')
top_window.attributes('-topmost', 'true')
top_window.wm_title('Top Window 1')
top_window = Toplevel(root,bg="lightgray")
top_window.geometry('1400x900')
top_window.attributes('-topmost','true')
top_window.wm_title('Top Window 2')
root.mainloop()
Both Toplevel windows appear on top of the root, but the one labelled Top Window 1 is on top of the one labelled Top Window 2, which is not what I would expect. (Note: For my actual application, I'll be reusing the Toplevel's name over and over, which is why I used the name top_window twice.)

Scroll tkinter ttk Entry text to the End in Python

I am trying to create a GUI form using Python tkinter. For a ttk Entry widget, I want to set a default text. I do that using the insert() as shown below-
from tkinter import *
from tkinter import ttk
root = Tk()
e = ttk.Entry(root, width=20)
e.pack()
e.insert(0, 'text greater than width of the widget')
The widget shows the beginning portion of the inserted text. Is there a way that I can make it scroll to the end of the inserted text by default?

You can call the xview method to scroll a given index into view:
e.xview("end")

How to move the entire window to a place on the screen (Tkinter, Python3)

The title says it all. How to move the entire window to a place on the screen using tkinter. This should be moving the root frame.

Use the geometry method of the root (or any Toplevel) window. For example:
import tkinter as tk
root = tk.Tk()
root.geometry("+200+400") # places the window at 200,400 on the screen

use this:
from tkinter import Tk
main=Tk()
main.geometry('+100+200')
main.mainloop()
or do it with function :
def change_position(root_variable,x,y):
root_variable.geometry('+{}+{}'.format(x,y))
and use :change_position(main,500,400)
edit: added dot for format

Python Tkinter Toplevel

I am working on a program that requires multiple windows, and the first one to appear is the login window, I used the Toplevel widget in order to make other windows its children, but this code keeps showing two windows instead of one.
from Tkinter import Frame, Toplevel
from ttk import Label, Entry, Button
class loginWindow(Toplevel):
def __init__(self):
Toplevel.__init__(self)
self.title("Title")
self.frame = Frame(self)
self.frame.pack()
self.__make_layout()
self.mainloop()
def __make_layout(self):
self.frame.user_name_label = Label(text="User name:")
self.frame.user_name_text = Entry()
self.frame.user_name_label.grid(row=0, column=0)
self.frame.user_name_text.grid(row=0, column=1)
self.frame.password_label = Label(text="Password:")
self.frame.password_text = Entry()
self.frame.password_label.grid(row=1, column=0)
self.frame.password_text.grid(row=1, column=1)
self.frame.login_button = Button(text="Login")# , command=self.__create_window)
self.frame.login_button.grid(row=2, column=0, columnspan=2)
if __name__ == '__main__':
win1 = loginWindow()

All of the widgets created in _make_layout are created without a parent. This means they're children of the default root. You need to pass a parent to each of them, the same way you do to the Frame. Like this:
self.frame.user_name_label = Label(self.frame, text="User name:")
self.frame.user_name_text = Entry(self.frame)
# etc.
When I run your exact code, I don't get a second window, on any platform I try. The closest I get is on OS X, where an entry for the default root window appears in the Window menu, but the window itself still doesn't appear and the widgets all end up on the Toplevel (although not on the Frame where you wanted them). But it certainly would be legal for Tkinter to show a second window here, and put some or all of your widgets on it.

This must be a platform dependent issue, since abarnert isn't having issues with multiple windows. I use OS X with XQuartz and the following code gives me two windows:
from Tkinter import Toplevel, Tk
Toplevel().mainloop()
However, this code gives me one window:
from Tkinter import Toplevel, Tk
Tk().mainloop()
I believe your first window should be declared Tk() and subsequent windows should be Toplevel().

Widgets disappear after tkMessageBox in Tkinter

Every time I use this code in my applications:
tkMessageBox.showinfo("Test", "Info goes here!")
a message box pops up (like it is supposed to), but after I click OK, the box disappears along with most of the other widgets on the window. How do I prevent the other widgets from disappearing?
Here Is My Code:
from Tkinter import *
import tkMessageBox
root = Tk()
root.minsize(600,600)
root.maxsize(600,600)
p1 = Label(root, bg='blue')
p1.place(width=600, height=600)
b1 = Button(p1, text="Test Button")
b1.place(x="30", y="50")
tkMessageBox.showinfo("Test", Info")
root.mainloop()

Ok, there are a few things going wrong here. First, your label has no string or image associated with it. Therefore, it's width and height will be very small. Because you use pack, the containing widget (the root window) will "shrink to fit" around this widget and any other widgets you pack in the root window.
Second, you use place for the button which means its size will not affect the size of the parent. Not only that, but you place the button inside the very tiny label. Thus, the only thing controlling the size of the parent is the label so the main window ends up being very small.
You have another problem is that you're showing the dialog before entering the event loop. I'm a bit surprised that it even works, but Tkinter sometimes does unusual things under the covers. You should enter the event loop before calling the dialog.
Try this variation of your code as a starting point:
from Tkinter import *
import tkMessageBox
def showInfo():
tkMessageBox.showinfo("Test","Info")
root = Tk()
p1 = Label(root, bg='blue', text="hello")
p1.pack()
b1 = Button(root, text="Test Button", command=showInfo)
b1.pack()
root.mainloop()