Creating NotePad using PyQt5 – Python

In this article we will see how we can create notepad using PyQt5.

Notepad is a generic text editor that allows you to create, open, edit, and read plaintext files.

PyQt5 is cross-platform GUI toolkit, a set of python bindings for Qt v5. One can develop an interactive desktop application with so much ease because of the tools and simplicity provided by this library.

Use this command to install PyQt5 :

pip install PyQt5

GUI Implementation Steps :
1. Create a Vertical layout
2. Create a QPlainTextEdit object and add it to the layout
3. Create a container i.e QWidget object
4. Set this vertical layout to the container
5. Create a status bar to show status tips
6. Create file menu bar and add file actions below is how file menu bar will look like

7. Create an edit menu bar and add various edit action to it, below is how edit menu bar will look like

8. Create two toolbar for file and edit actions, below is how the toolbars will look like

Back End Implementation Steps :
1. Create a path variable and set it to None
2. Add actions to each of the file menu actions these are same of toolbar actions as both share same actions
3. Create a critical method that shows the passed value in the pop up, it is used to show if any error occurs during saving or opening file
4. Create update title method that changes the window title according to the name of the file
5. Inside the file open action, create a try-except block that try to open the file and then update the title and path
6. Inside the save action if path is none call the save as method else save file to the path
7. Inside the save as method save the file at the selected path by user
8. Inside the print action print the file using QPrintDialog object
9. Inside the edit toogle bar action set the line wrap mode of editor according to the checked state
10. Similarly set action for undo, redo, cut, copy, paste and select all using the QPlainTextEdit object built in functions

Below is the implementation





# importing required libraries
from PyQt5.QtGui import * 
from PyQt5.QtWidgets import * 
from PyQt5.QtCore import * 
from PyQt5.QtPrintSupport import * 
import os
import sys
# Creating main window class
class MainWindow(QMainWindow):
    # constructor
    def __init__(self, *args, **kwargs):
        super(MainWindow, self).__init__(*args, **kwargs)
        # setting window geometry
        self.setGeometry(100, 100, 600, 400)
        # creating a layout
        layout = QVBoxLayout()
        # creating a QPlainTextEdit object
        self.editor = QPlainTextEdit()
        # setting font to the editor
        fixedfont = QFontDatabase.systemFont(QFontDatabase.FixedFont)
        # self.path holds the path of the currently open file.
        # If none, we haven't got a file open yet (or creating new).
        self.path = None
        # adding editor to the layout
        # creating a QWidget layout
        container = QWidget()
        # setting layout to the container
        # making container as central widget
        # creating a status bar object
        self.status = QStatusBar()
        # setting stats bar to the winow
        # creating a file tool bar
        file_toolbar = QToolBar("File")
        # adding file tool bar to the window
        # creating a file menu
        file_menu = self.menuBar().addMenu("&File")
        # creating actions to add in the file menu
        # creating a open file action
        open_file_action = QAction("Open file", self)
        # setting status tip
        open_file_action.setStatusTip("Open file")
        # adding action to the open file
        # adding this to file menu
        # adding this to tool bar
        # similarly creating a save action
        save_file_action = QAction("Save", self)
        save_file_action.setStatusTip("Save current page")
        # similarly creating save action
        saveas_file_action = QAction("Save As", self)
        saveas_file_action.setStatusTip("Save current page to specified file")
        # for print action
        print_action = QAction("Print", self)
        print_action.setStatusTip("Print current page")
        # creating another tool bar for editing text
        edit_toolbar = QToolBar("Edit")
        # adding this tool bar to the main window
        # creating a edit menu bar
        edit_menu = self.menuBar().addMenu("&Edit")
        # adding actions to the tool bar and menu bar
        # undo action
        undo_action = QAction("Undo", self)
        # adding status tip
        undo_action.setStatusTip("Undo last change")
        # when triggered undo the editor
        # adding this to tool and menu bar
        # redo action
        redo_action = QAction("Redo", self)
        redo_action.setStatusTip("Redo last change")
        # when triggered redo the editor
        # adding this to menu and tool bar
        # cut action
        cut_action = QAction("Cut", self)
        cut_action.setStatusTip("Cut selected text")
        # when triggered cut the editor text
        # adding this to menu and tool bar
        # copy action
        copy_action = QAction("Copy", self)
        copy_action.setStatusTip("Copy selected text")
        # when triggered copy the editor text
        # adding this to menu and tool bar
        # paste action
        paste_action = QAction("Paste", self)
        paste_action.setStatusTip("Paste from clipboard")
        # when triggered paste the copied text
        # adding this to menu and tool bar
        # select all action
        select_action = QAction("Select all", self)
        select_action.setStatusTip("Select all text")
        # when this triggered select the whole text
        # adding this to menu and tool bar
        # wrap action
        wrap_action = QAction("Wrap text to window", self)
        wrap_action.setStatusTip("Check to wrap text to window")
        # making it checkable
        # making it checked
        # adding action
        # adding it to edit menu not to the tool bar
        # calling update title methpd
        # showing all the components
    # creating dialog critical method
    # to show errors
    def dialog_critical(self, s):
        # creating a QMessageBox object
        dlg = QMessageBox(self)
        # setting text to the dlg
        # setting icon to it
        # showing it
    # action called by file open action
    def file_open(self):
        # getting path and bool value
        path, _ = QFileDialog.getOpenFileName(self, "Open file", "", 
                             "Text documents (*.txt);All files (*.*)")
        # if path is true
        if path:
            # try opening path
                with open(path, 'rU') as f:
                    # read the file
                    text =
            # if some error occured
            except Exception as e:
                # show error using critical method
            # else
                # update path value
                self.path = path
                # update the text
                # update the title
    # action called by file save action
    def file_save(self):
        # if there is no save path
        if self.path is None:
            # call save as method
            return self.file_saveas()
        # else call save to path method
    # action called by save as action
    def file_saveas(self):
        # opening path
        path, _ = QFileDialog.getSaveFileName(self, "Save file", "", 
                             "Text documents (*.txt);All files (*.*)")
        # if dialog is cancelled i.e no path is selected
        if not path:
            # return this method
            # i.e no action performed
        # else call save to path method
    # save to path method
    def _save_to_path(self, path):
        # get the text
        text = self.editor.toPlainText()
        # try catch block
            # opening file to write
            with open(path, 'w') as f:
                # write text in the file
        # if error occurs
        except Exception as e:
            # show error using critical
        # else do this
            # change path
            self.path = path
            # update the title
    # action called by print
    def file_print(self):
        # creating a QPrintDialog
        dlg = QPrintDialog()
        # if executed
        if dlg.exec_():
            # print the text
    # update title method
    def update_title(self):
        # setting window title with prefix as file name
        # suffix aas PyQt5 Notepad
        self.setWindowTitle("%s - PyQt5 Notepad" %(os.path.basename(self.path) 
                                                  if self.path else "Untitled"))
    # action called by edit toggle
    def edit_toggle_wrap(self):
        # chaning line wrap mode
        self.editor.setLineWrapMode(1 if self.editor.lineWrapMode() == 0 else 0 )
# drivers code
if __name__ == '__main__':
    # creating PyQt5 application
    app = QApplication(sys.argv)
    # setting application name
    # creating a main window object
    window = MainWindow()
    # loop


Output :

My Personal Notes arrow_drop_up

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