Tkinter is a Python binding to the Tk GUI toolkit. It is the standard Python interface to the Tk GUI toolkit, and is Python's de facto standard GUI. Tkinter is included with standard Linux, Microsoft Windows and Mac OS X installs of Python.
The name Tkinter comes from Tk interface. Tkinter was written by Fredrik Lundh.
As with most other modern Tk bindings, Tkinter is implemented as a Python wrapper around a complete Tcl interpreter embedded in the Python interpreter. Tkinter calls are translated into Tcl commands which are fed to this embedded interpreter, thus making it possible to mix Python and Tcl in a single application.
This term has different meanings in different contexts, but in general it refers to a rectangular area somewhere on the user's display screen.
Top Level Window
A window that exists independently on the screen. It will be decorated with the standard frame and controls for the desktop manager. It can be moved around the desktop, and can usually be resized.
The generic term for any of the building blocks that make up an application in a graphical user interface.
- Core widgets: The containers: frame, labelframe, toplevel, paned window. The buttons: button, radiobutton, checkbutton (checkbox), and menubutton. The text widgets: label, message, text. The entry widgets: scale, scrollbar, listbox, slider, spinbox, entry (singleline), optionmenu, text (multiline), and canvas (vector and pixel graphics).
- Tkinter provides three modules that allow pop-up dialogs to be displayed: tk.messagebox (confirmation, information, warning and error dialogs), tk.filedialog (single file, multiple file and directory selection dialogs) and tk.colorchooser (colour picker).
- Python 2.7 and Python 3.1 incorporate the "themed Tk" ("ttk") functionality of Tk 8.5. This allows Tk widgets to be easily themed to look like the native desktop environment in which the application is running, thereby addressing a long-standing criticism of Tk (and hence of Tkinter). Some widgets are exclusive to ttk, such as the combobox, progressbar and treeview widgets
In Tkinter, the Frame widget is the basic unit of organization for complex layouts. A frame is a rectangular area that can contain other widgets.
Child and parent
When any widget is created, a parent-child relationship is created. For example, if you place a text label inside a frame, the frame is the parent of the label.
A minimal application
1 #!/usr/bin/env python3 2 from tkinter import * 3 root = Tk() # Create the root (base) window 4 w = Label(root, text="Hello, world!") # Create a label with words 5 w.pack() # Put the label into the window 6 root.mainloop() # Start the event loop
There are four stages to creating a widget
- create it within a frame
- change the widgets attributes
- pack it into position so it becomes visible
- bind it to a function or event. 
These are often compressed and the order can vary.
Using the object orientated paradigm in Python, a simple program would be (requires Tcl version 8.6, which is not used by Python on MacOS by default):
1 #!/usr/bin/env python3 2 import tkinter as tk 3 4 class Application(tk.Frame): 5 6 def __init__(self, master=None): 7 tk.Frame.__init__(self, master) 8 self.grid() 9 self.createWidgets() 10 11 def createWidgets(self): 12 self.mondialLabel = tk.Label(self, text='Hello World') 13 self.mondialLabel.config(bg="#00ffff") 14 self.mondialLabel.grid() 15 self.quitButton = tk.Button(self, text='Quit', command=self.quit) 16 self.quitButton.grid() 17 18 app = Application() 19 app.master.title('Sample application') 20 app.mainloop()
- line 1: Hashbang directive to the program launcher, allowing the selection of an appropriate interpreter executable, when self-executing.
- line 2: This line imports the tkinter module into your program's namespace, but renames it as tk.
- line 4: The application class inherits from Tkinter's Frame class.
- line 6: Defines the function that sets up the Frame
- line 7: Calls the constructor for the parent class, Frame.
- line 11: Defining the widgets
- line 12: Creates a label, named MondialLabel with the text "Hello World"
- line 13: Sets the MondialLabel background colour to cyan
- line 14: Places the label on the application so it is visible using the grid geometry manager method
- line 15: Creates a button labeled “Quit”.
- line 16: Places the button on the application. Grid, place and pack are all methods of making the widget visible
- line 18: The main program starts here by instantiating the Application class.
- line 19: This method call sets the title of the window to “Sample application”.
- line 20: Starts the application's main loop, waiting for mouse and keyboard events.
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