The tkinter package (“Tk interface”) is the standard Python interface to the Tcl/Tk GUI toolkit. Both Tk and tkinter are available on most Unix platforms, including macOS, as well as on Windows systems.
Running python -m tkinter from the command line should open a window demonstrating a simple Tk interface, letting you know that tkinter is properly installed on your system, and also showing what version of Tcl/Tk is installed, so you can read the Tcl/Tk documentation specific to that version.
Tkinter supports a range of Tcl/Tk versions, built either with or without thread support. The official Python binary release bundles Tcl/Tk 8.6 threaded. See the source code for the _tkinter module for more information about supported versions.
Tkinter is not a thin wrapper, but adds a fair amount of its own logic to make the experience more pythonic. This documentation will concentrate on these additions and changes, and refer to the official Tcl/Tk documentation for details that are unchanged.
A Simple Hello World Program
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25 | import tkinter as tk
class Application(tk.Frame):
def __init__(self, master=None):
super().__init__(master)
self.master = master
self.pack()
self.create_widgets()
def create_widgets(self):
self.hi_there = tk.Button(self)
self.hi_there["text"] = "Hello cadwork World\n(click me)"
self.hi_there["command"] = self.say_hi
self.hi_there.pack(side="top")
self.quit = tk.Button(self, text="QUIT", fg="blue",
command=self.master.destroy)
self.quit.pack(side="bottom")
def say_hi(self):
print("hi there, everyone!")
root = tk.Tk()
app = Application(master=root)
app.mainloop()
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21 | import tkinter as tk
class MyApp(tk.Frame):
def __init__(self, master=None):
super().__init__(master)
self.pack()
self.ok = tk.Button(self)
self.ok["text"] = "cadwork"
self.ok["command"] = self.handler
self.ok.pack()
def handler(self):
print("Button clicked")
if __name__ == "__main__":
root = tk.Tk()
root.geometry("500x300")
app = MyApp(root)
app.mainloop()
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29 | import tkinter as tk
class App(tk.Frame):
def __init__(self, master):
super().__init__(master)
self.pack()
self.entrythingy = tk.Entry()
self.entrythingy.pack()
# Create the application variable.
self.contents = tk.StringVar()
# Set it to some value.
self.contents.set("this is a variable")
# Tell the entry widget to watch this variable.
self.entrythingy["textvariable"] = self.contents
# Define a callback for when the user hits return.
# It prints the current value of the variable.
self.entrythingy.bind('<Key-Return>',
self.print_contents)
def print_contents(self, event):
print("Hi. The current entry content is:",
self.contents.get())
root = tk.Tk()
myapp = App(root)
myapp.mainloop()
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PyQt 5
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21 | from PyQt5.QtWidgets import (QWidget, QToolTip,
QPushButton, QApplication,
QLabel)
class MyWindow(QWidget):
def __init__(self):
super().__init__()
self.initUI()
def initUI(self):
btn = QPushButton('Button', self)
btn.resize(btn.sizeHint())
btn.move(50, 50)
self.setGeometry(300, 300, 300, 200)
self.setWindowTitle('Qt5 Button')
if __name__ == '__main__':
window = MyWindow()
window.show()
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