How to create a Notepad App with Tkinter in Python? [ Full Project ]

Notepad is a simple and widely-used text editor, and with the help of the Tkinter module in Python, we can build our own version. Tkinter provides an easy-to-use interface for creating graphical user interfaces (GUIs).

The provided code is an implementation of a basic text editor using the Tkinter library in Python. Let’s go through the code step by step and explain its functionality:

Importing Required Modules:


import os.path
from tkinter import *
from tkinter.messagebox import showinfo
from tkinter.filedialog import askopenfilename, asksaveasfilename

os.path: This module provides functions for working with file paths.
tkinter: It is a standard Python interface to the Tk GUI toolkit.
tkinter.messagebox: It provides the showinfo function to display message boxes.
tkinter.filedialog: It provides functions to open and save files using a dialog box.

Creating the Application Window:


root = Tk()
root.title("untitled~notepad")
root.geometry("1140x930")

Tk(): Creates the main application window.
title(): Sets the title of the window.
geometry(): Sets the size of the window.

Creating the Text Area:


TextArea = Text(font="lucida 13")
TextArea.pack(expand=True, fill=BOTH)

Text(): Creates a text widget where the user can input and view text.
pack(): Organizes the widget in the window.

Global Variables and Functions:


def new_file():
    global file
    root.title("untitled~notepad")
    file = None
    TextArea.delete(1.0, END)


def open_file():
    global file
    file = askopenfilename(defaultextension=".txt", filetypes=[("All Files", "*.*"), ("Text Documents", "*.txt")])
    if file == "":
        file = None
    else:
        root.title(os.path.basename(file) + " - Notepad")
        TextArea.delete(1.0, END)
        with open(file, "r") as f:
            TextArea.insert(1.0, f.read())


def save_file():
    global file
    if file is None:
        file = asksaveasfilename(initialfile="untitled.txt", defaultextension=".txt",
                                 filetypes=[("All Files", "*.*"), ("Text Documents", "*.txt")])
        if file == "":
            file = None
        else:
            with open(file, "w") as f:
                f.write(TextArea.get(1.0, END))
            root.title(os.path.basename(file) + " - Notepad")
            print("File saved successfully")
    else:
        with open(file, "w") as f:
            f.write(TextArea.get(1.0, END))


def cut_text():
    TextArea.event_generate("<<Cut>>")


def copy_text():
    TextArea.event_generate("<<Copy>>")


def paste_text():
    TextArea.event_generate("<<Paste>>")


def about_notepad():
    showinfo("About Notepad", "Made with Love by Developer Ritesh")


def quit_notepad():
    root.destroy()

These functions will be used to perform various operations on the text editor, such as creating a new file, opening an existing file, saving the file, etc.

Creating the Menus:


menubar = Menu(root)
file_menu = Menu(menubar, tearoff=0)
# File menu options

edit_menu = Menu(menubar, tearoff=0)
# Edit menu options

help_menu = Menu(menubar, tearoff=0)
# Help menu options

root.config(menu=menubar)

Menu(): Creates a menu widget.
menubar: The main menu bar for the window.
tearoff=0: Disables the tear-off feature of menus.

File Menu Options:


file_menu.add_command(label="New", command=new_file)
file_menu.add_separator()
file_menu.add_command(label="Open", command=open_file)
file_menu.add_separator()
file_menu.add_command(label="Save", command=save_file)
file_menu.add_separator()
file_menu.add_command(label="Exit", command=quit_notepad)
menubar.add_cascade(label="File", menu=file_menu)

add_command(): Adds a menu item with a label and a command.
add_separator(): Adds a separator line between menu items.
add_cascade(): Adds a menu cascade, which is a hierarchical menu.

The file menu options include “New,” “Open,” “Save,” and “Exit.” They are associated with their respective functions defined earlier.

Edit Menu Options:


edit_menu.add_command(label="Cut", command=cut_text)
edit_menu.add_separator()
edit_menu.add_command(label="Copy", command=copy_text)
edit_menu.add_separator()
edit_menu.add_command(label="Paste", command=paste_text)
menubar.add_cascade(label="Edit", menu=edit_menu)

The edit menu options include “Cut,” “Copy,” and “Paste.” They are associated with their respective functions defined earlier.

Help Menu Options:


help_menu.add_command(label="About Notepad", command=about_notepad)
menubar.add_cascade(label="Help", menu=help_menu)

The help menu includes an “About Notepad” option, which is associated with the about_notepad() function.

Scrollbar:


scroll = Scrollbar(TextArea)
scroll.pack(side=RIGHT, fill="y")
scroll.config(command=TextArea.yview)
TextArea.config(yscrollcommand=scroll.set)

A scrollbar is added to the text area to scroll through the content.

Configuring the Application:


root.config(menu=menubar)

The application’s main window is configured to display the menu bar.

Running the Application:


root.mainloop()

The main event loop that handles user events and keeps the application running.

That’s the overview of the code! The provided code creates a basic text editor with features like creating new files, opening existing files, saving files, cutting, copying, and pasting text, along with an “About Notepad” option for displaying information about the text editor.

Full Source Code


import os.path
from tkinter import *
from tkinter.messagebox import showinfo
from tkinter.filedialog import askopenfilename, asksaveasfilename

root = Tk()
root.title("untitled~notepad")
root.geometry("1140x930")
TextArea = Text(font="lucida 13")
file = None
TextArea.pack(expand=True, fill=BOTH)


def new_file():
    global file
    root.title("untitled~notepad")
    file = None
    TextArea.delete(1.0, END)


def open_file():
    global file
    file = askopenfilename(defaultextension=".txt", filetypes=[("All Files", "*.*"), ("Text Documents", "*.txt")])
    if file == "":
        file = None
    else:
        root.title(os.path.basename(file) + " - Notepad")
        TextArea.delete(1.0, END)
        with open(file, "r") as f:
            TextArea.insert(1.0, f.read())


def save_file():
    global file
    if file is None:
        file = asksaveasfilename(initialfile="untitled.txt", defaultextension=".txt",
                                 filetypes=[("All Files", "*.*"), ("Text Documents", "*.txt")])
        if file == "":
            file = None
        else:
            with open(file, "w") as f:
                f.write(TextArea.get(1.0, END))
            root.title(os.path.basename(file) + " - Notepad")
            print("File saved successfully")
    else:
        with open(file, "w") as f:
            f.write(TextArea.get(1.0, END))


def cut_text():
    TextArea.event_generate("<<Cut>>")


def copy_text():
    TextArea.event_generate("<<Copy>>")


def paste_text():
    TextArea.event_generate("<<Paste>>")


def about_notepad():
    showinfo("About Notepad", "Made with Love by Developer Ritesh")


def quit_notepad():
    root.destroy()


menubar = Menu(root)
file_menu = Menu(menubar, tearoff=0)
file_menu.add_command(label="New", command=new_file)
file_menu.add_separator()
file_menu.add_command(label="Open", command=open_file)
file_menu.add_separator()
file_menu.add_command(label="Save", command=save_file)
file_menu.add_separator()
file_menu.add_command(label="Exit", command=quit_notepad)
menubar.add_cascade(label="File", menu=file_menu)

edit_menu = Menu(menubar, tearoff=0)
edit_menu.add_command(label="Cut", command=cut_text)
edit_menu.add_separator()
edit_menu.add_command(label="Copy", command=copy_text)
edit_menu.add_separator()
edit_menu.add_command(label="Paste", command=paste_text)
menubar.add_cascade(label="Edit", menu=edit_menu)

help_menu = Menu(menubar, tearoff=0)
help_menu.add_command(label="About Notepad", command=about_notepad)
menubar.add_cascade(label="Help", menu=help_menu)

scroll = Scrollbar(TextArea)
scroll.pack(side=RIGHT, fill="y")
scroll.config(command=TextArea.yview)
TextArea.config(yscrollcommand=scroll.set)
TextArea.pack()

root.config(menu=menubar)
root.mainloop()

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