Build a Simple Tkinter Calculator, Notepad, and Login App in Python

Calculator

Case introduction: This example uses Python and Tkinter to develop a simple graphical calculator that can perform basic arithmetic operations. It is suitable for users with basic Python and Tkinter knowledge.

Design principle

To build a calculator you need interface components, event listeners, and the logic that processes the events. The layout creates widgets, initializes them, and manages their hierarchy and placement.

Example effect

Source code

import tkinter
import math
import tkinter.messagebox

class Calculator(object):
    def __init__(self):
        self.root = tkinter.Tk()
        self.root.minsize(280, 450)
        self.root.maxsize(280, 470)
        self.root.title('计算器')
        self.result = tkinter.StringVar()
        self.result.set(0)
        self.lists = []
        self.ispresssign = False
        self.menus()
        self.layout()
        self.root.mainloop()
    # ... (rest of code omitted for brevity)

Notepad

Tkinter is Python's standard GUI library. It is easy to use and integrates well with Python, but lacks a visual designer, so windows are built programmatically.

This example implements a simple text editor with file operations, edit functions, and a search feature. It is of medium difficulty and suitable for users familiar with Python and Tkinter.

Example effect

Source code

from tkinter import *
from tkinter.filedialog import *
from tkinter.messagebox import *
import os

def author():
    showinfo(title="作者", message="Python")
# ... (rest of code omitted for brevity)

Login and Registration

This example creates a user login and registration interface using Tkinter. It demonstrates how to use canvas, text boxes, buttons, and the pickle module for persisting user data.

Example effect

Source code

import tkinter as tk
import pickle
import tkinter.messagebox
from PIL import Image, ImageTk

window = tk.Tk()
window.title('欢迎登录')
window.geometry('450x300')
# ... (rest of code omitted for brevity)