notepad app in python by ganesh kavhar

Make Notepad using Tkinter

Let’s see how to create a simple notepad in Python using Tkinter. This notepad GUI will consist of various menu like file and edit, using which all functionalities like saving the file, opening a file, editing, cut and paste can be done.

Now for creating this notepad, Python 3 and Tkinter should already be installed in your system. You can download suitable python package as per system requirement. After you have successfully installed python you need to install Tkinter (a Python’s GUI package).

Use this command to install Tkinter :

pip install python-tk

Importing Tkinter :

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import tkinter

import os

from tkinter import *

# To get the space above for message

from tkinter.messagebox import *

# To get the dialog box to open when required

from tkinter.filedialog import *

Note : messagebox is used to write the message in the white box called notepad and filedialog is used for the dialog box to appear when you are opening file from anywhere in your system or saving your file in a particular position or place.

Adding Menu :

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# Add controls(widget)

self.__thisTextArea.grid(sticky = N + E + S + W)

# To open new file

self.__thisFileMenu.add_command(label = "New",

command = self.__newFile)

# To open a already existing file

self.__thisFileMenu.add_command(label = "Open",

command = self.__openFile)

# To save current file

self.__thisFileMenu.add_command(label = "Save",

command = self.__saveFile)

# To create a line in the dialog

self.__thisFileMenu.add_separator()

# To terminate

self.__thisFileMenu.add_command(label = "Exit",

command = self.__quitApplication)

self.__thisMenuBar.add_cascade(label = "File",

menu = self.__thisFileMenu)

# To give a feature of cut

self.__thisEditMenu.add_command(label = "Cut",

command = self.__cut)

# To give a feature of copy

self.__thisEditMenu.add_command(label = "Copy",

command = self.__copy)

# To give a feature of paste

self.__thisEditMenu.add_command(label = "Paste",

command = self.__paste)

# To give a feature of editing

self.__thisMenuBar.add_cascade(label = "Edit",

menu = self.__thisEditMenu)

# To create a feature of description of the notepad

self.__thisHelpMenu.add_command(label = "About Notepad",

command = self.__showAbout)

self.__thisMenuBar.add_cascade(label = "Help",

menu = self.__thisHelpMenu)

self.__root.config(menu = self.__thisMenuBar)

self.__thisScrollBar.pack(side = RIGHT, fill = Y)

# Scrollbar will adjust automatically

# according to the content

self.__thisScrollBar.config(command = self.__thisTextArea.yview)

self.__thisTextArea.config(yscrollcommand = self.__thisScrollBar.set)

With this code we will add the menu in the windows of our notepad and will add the things like copy, paste, save etc, to it.

Adding The Functionality :

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def __quitApplication(self):

self.__root.destroy()

# exit()

def __showAbout(self):

showinfo("Notepad", "Mrinal Verma")

def __openFile(self):

self.__file = askopenfilename(defaultextension=".txt",

filetypes=[("All Files","*.*"),

("Text Documents","*.txt")])

if self.__file == "":

# no file to open

self.__file = None

else:

# try to open the file

# set the window title

self.__root.title(os.path.basename(self.__file) + " - Notepad")

self.__thisTextArea.delete(1.0,END)

file = open(self.__file,"r")

self.__thisTextArea.insert(1.0,file.read())

file.close()

def __newFile(self):

self.__root.title("Untitled - Notepad")

self.__file = None

self.__thisTextArea.delete(1.0,END)

def __saveFile(self):

if self.__file == None:

#save as new file

self.__file = asksaveasfilename(initialfile='Untitled.txt',

defaultextension=".txt",

filetypes=[("All Files","*.*"),

("Text Documents","*.txt")])

if self.__file == "":

self.__file = None

else:

# try to save the file

file = open(self.__file,"w")

file.write(self.__thisTextArea.get(1.0,END))

file.close()

# change the window title

self.__root.title(os.path.basename(self.__file) + " - Notepad")

else:

file = open(self.__file,"w")

file.write(self.__thisTextArea.get(1.0,END))

file.close()

def __cut(self):

self.__thisTextArea.event_generate("<<Cut>>")

def __copy(self):

self.__thisTextArea.event_generate("<<Copy>>")

def __paste(self):

self.__thisTextArea.event_generate("<<Paste>>")

In this we have added all the functionality that is required in the notepad, you can add other functionality too in this like the font size, font color, bold, underlined, etc.

Main Code After Merging All :

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import tkinter

import os

from tkinter import *

from tkinter.messagebox import *

from tkinter.filedialog import *

class Notepad:

__root = Tk()

# default window width and height

__thisWidth = 300

__thisHeight = 300

__thisTextArea = Text(__root)

__thisMenuBar = Menu(__root)

__thisFileMenu = Menu(__thisMenuBar, tearoff=0)

__thisEditMenu = Menu(__thisMenuBar, tearoff=0)

__thisHelpMenu = Menu(__thisMenuBar, tearoff=0)

# To add scrollbar

__thisScrollBar = Scrollbar(__thisTextArea)

__file = None

def __init__(self,**kwargs):

# Set icon

try:

self.__root.wm_iconbitmap("Notepad.ico")

except:

pass

# Set window size (the default is 300x300)

try:

self.__thisWidth = kwargs['width']

except KeyError:

pass

try:

self.__thisHeight = kwargs['height']

except KeyError:

pass

# Set the window text

self.__root.title("Untitled - Notepad")

# Center the window

screenWidth = self.__root.winfo_screenwidth()

screenHeight = self.__root.winfo_screenheight()

# For left-alling

left = (screenWidth / 2) - (self.__thisWidth / 2)

# For right-allign

top = (screenHeight / 2) - (self.__thisHeight /2)

# For top and bottom

self.__root.geometry('%dx%d+%d+%d' % (self.__thisWidth,

self.__thisHeight,

left, top))

# To make the textarea auto resizable

self.__root.grid_rowconfigure(0, weight=1)

self.__root.grid_columnconfigure(0, weight=1)

# Add controls (widget)

self.__thisTextArea.grid(sticky = N + E + S + W)

# To open new file

self.__thisFileMenu.add_command(label="New",

command=self.__newFile)

# To open a already existing file

self.__thisFileMenu.add_command(label="Open",

command=self.__openFile)

# To save current file

self.__thisFileMenu.add_command(label="Save",

command=self.__saveFile)

# To create a line in the dialog

self.__thisFileMenu.add_separator()

self.__thisFileMenu.add_command(label="Exit",

command=self.__quitApplication)

self.__thisMenuBar.add_cascade(label="File",

menu=self.__thisFileMenu)

# To give a feature of cut

self.__thisEditMenu.add_command(label="Cut",

command=self.__cut)

# to give a feature of copy

self.__thisEditMenu.add_command(label="Copy",

command=self.__copy)

# To give a feature of paste

self.__thisEditMenu.add_command(label="Paste",

command=self.__paste)

# To give a feature of editing

self.__thisMenuBar.add_cascade(label="Edit",

menu=self.__thisEditMenu)

# To create a feature of description of the notepad

self.__thisHelpMenu.add_command(label="About Notepad",

command=self.__showAbout)

self.__thisMenuBar.add_cascade(label="Help",

menu=self.__thisHelpMenu)

self.__root.config(menu=self.__thisMenuBar)

self.__thisScrollBar.pack(side=RIGHT,fill=Y)

# Scrollbar will adjust automatically according to the content

self.__thisScrollBar.config(command=self.__thisTextArea.yview)

self.__thisTextArea.config(yscrollcommand=self.__thisScrollBar.set)

def __quitApplication(self):

self.__root.destroy()

# exit()

def __showAbout(self):

showinfo("Notepad","Mrinal Verma")

def __openFile(self):

self.__file = askopenfilename(defaultextension=".txt",

filetypes=[("All Files","*.*"),

("Text Documents","*.txt")])

if self.__file == "":

# no file to open

self.__file = None

else:

# Try to open the file

# set the window title

self.__root.title(os.path.basename(self.__file) + " - Notepad")

self.__thisTextArea.delete(1.0,END)

file = open(self.__file,"r")

self.__thisTextArea.insert(1.0,file.read())

file.close()

def __newFile(self):

self.__root.title("Untitled - Notepad")

self.__file = None

self.__thisTextArea.delete(1.0,END)

def __saveFile(self):

if self.__file == None:

# Save as new file

self.__file = asksaveasfilename(initialfile='Untitled.txt',

defaultextension=".txt",

filetypes=[("All Files","*.*"),

("Text Documents","*.txt")])

if self.__file == "":

self.__file = None

else:

# Try to save the file

file = open(self.__file,"w")

file.write(self.__thisTextArea.get(1.0,END))

file.close()

# Change the window title

self.__root.title(os.path.basename(self.__file) + " - Notepad")

else:

file = open(self.__file,"w")

file.write(self.__thisTextArea.get(1.0,END))

file.close()

def __cut(self):

self.__thisTextArea.event_generate("<<Cut>>")

def __copy(self):

self.__thisTextArea.event_generate("<<Copy>>")

def __paste(self):

self.__thisTextArea.event_generate("<<Paste>>")

def run(self):

# Run main application

self.__root.mainloop()

# Run main application

notepad = Notepad(width=600,height=400)

notepad.run()

To run this code, save it by the extension .py and then open cmd(command prompt) and move to the location of the file saved and then write the following

python "filename".py

and press enter and it will run. Or can be run directly by simply double clicking your .py extension file.

Output :

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notepad app in python by ganesh kavhar

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