{"id":80066,"date":"2020-10-01T12:40:09","date_gmt":"2020-10-01T07:10:09","guid":{"rendered":"https:\/\/techvidvan.com\/tutorials\/?p=80066"},"modified":"2026-06-03T15:31:15","modified_gmt":"2026-06-03T10:01:15","slug":"python-calculator-program","status":"publish","type":"post","link":"https:\/\/techvidvan.com\/tutorials\/python-calculator-program\/","title":{"rendered":"Python Calculator – Create a Calculator using Python"},"content":{"rendered":"

In today’s era, everyone wants to become a python expert, but how? The answer is to work on projects. In this article, TechVidvan presents a python project for beginners – Simple Calculator<\/strong>, so let’s start the work.<\/p>\n

Simple Calculator in Python<\/strong><\/p>\n

Doing a mathematical calculation in your head, not trusting your answer, so you ended up using a calculator anyway. So we have just proved the importance of the simplest machine you\u2019ve ever seen. Now let\u2019s see how we can create this simple calculator using Python.<\/p>\n

\"python<\/a><\/p>\n

Project Prerequisites<\/h3>\n

To implement this project you need to know the following:<\/p>\n

    \n
  1. Basic concepts of Python<\/li>\n
  2. Tkinter – To create GUI<\/li>\n<\/ol>\n

    To install the libraries, you can use pip installer from the cmd\/Terminal:<\/p>\n

    Pip install tkinter<\/pre>\n
    Steps to Create Simple Calculator using Python<\/h2>\n
    Download Python Calculator Code<\/h3>\n
    Please download source code of calculator project: Python Calculator<\/strong><\/a><\/p>\n
    Let’s start the coding<\/strong><\/p>\n
    Now, we will write the python program to create a calculator<\/p>\n
    Create main.py<\/h3>\n
    Create main.py file and add the following code (alternatively, you can use the code which you downloaded in previous step):<\/p>\n
    Code:<\/strong><\/p>\n
    from tkinter import *\r\n\r\ndef click(num):\r\n    global op\r\n    op=op+str(num)\r\n    iptext.set(op)\r\n\r\ndef evaluate():\r\n    global op\r\n    output=str(eval(op))\r\n    iptext.set(output)\r\n\r\ndef clearDisplay():\r\n    global op\r\n    op=\"\"\r\n    iptext.set(op)\r\n\r\ncalc=Tk()\r\ncalc.title(\"TechVidvan Calculator\")\r\nop=\"\"\r\n\r\niptext=StringVar()\r\niparea=Entry(calc,font=('large,_font',15,'bold'),bd=10,justify=\"right\",insertwidth=4,textvariable=iptext).grid(columnspan=10)\r\n\r\nbt7=Button(calc,font=('arial',15,'bold'),command=lambda:click(7),bg=\"lavender\",text=\"7\",bd=5,padx=15,pady=10).grid(row=1,column=0)\r\n\r\nbt8=Button(calc,font=('arial',15,'bold'),command=lambda:click(8),bg=\"lavender\",text=\"8\",bd=5,padx=15,pady=10).grid(row=1,column=1)\r\n\r\nbt9=Button(calc,font=('arial',15,'bold'),command=lambda:click(9),bg=\"lavender\",text=\"9\",bd=5,padx=15,pady=10).grid(row=1,column=2)\r\n\r\nadd=Button(calc,font=('arial',15,'bold'),command=lambda:click('+'),bg=\"lavender\",text=\"+\",bd=5,padx=15,pady=10).grid(row=1,column=3)\r\n\r\nbt4=Button(calc,font=('arial',15,'bold'),command=lambda:click(4),bg=\"lavender\",text=\"4\",bd=5,padx=15,pady=10).grid(row=2,column=0)\r\n\r\nbt5=Button(calc,font=('arial',15,'bold'),command=lambda:click(5),bg=\"lavender\",text=\"5\",bd=5,padx=15,pady=10).grid(row=2,column=1)\r\n\r\nbt6=Button(calc,font=('arial',15,'bold'),command=lambda:click(6),bg=\"lavender\",text=\"6\",bd=5,padx=15,pady=10).grid(row=2,column=2)\r\n\r\nsub=Button(calc,font=('arial',15,'bold'),command=lambda:click('-'),bg=\"lavender\",text=\"-\",bd=5,padx=15,pady=10).grid(row=2,column=3)\r\n\r\nbt1=Button(calc,font=('arial',15,'bold'),command=lambda:click(1),bg=\"lavender\",text=\"1\",bd=5,padx=15,pady=10).grid(row=3,column=0)\r\n\r\nbt2=Button(calc,font=('arial',15,'bold'),command=lambda:click(2),bg=\"lavender\",text=\"2\",bd=5,padx=15,pady=10).grid(row=3,column=1)\r\n\r\nbt3=Button(calc,font=('arial',15,'bold'),command=lambda:click(3),bg=\"lavender\",text=\"3\",bd=5,padx=15,pady=10).grid(row=3,column=2)\r\n\r\nmul=Button(calc,font=('arial',15,'bold'),command=lambda:click('*'),bg=\"lavender\",text=\"*\",bd=5,padx=15,pady=10).grid(row=3,column=3)\r\n\r\nbt0=Button(calc,font=('arial',15,'bold'),command=lambda:click(0),bg=\"lavender\",text=\"0\",bd=5,padx=15,pady=10).grid(row=4,column=0)\r\n\r\nbtC=Button(calc,font=('arial',15,'bold'),command=clearDisplay,bg=\"lavender\",text=\"C\",bd=5,padx=15,pady=10).grid(row=4,column=1)\r\n\r\neql=Button(calc,font=('arial',15,'bold'),command=evaluate,bg=\"lavender\",text=\"=\",bd=5,padx=15,pady=10).grid(row=4,column=2)\r\n\r\ndiv=Button(calc,font=('arial',15,'bold'),command=lambda:click('\/'),bg=\"lavender\",text=\"\/\",bd=5,padx=15,pady=10).grid(row=4,column=3)\r\n\r\ncalc.mainloop(),<\/pre>\n
     <\/p>\n
    Explanation:<\/strong><\/p>\n
    After importing tkinter, we have defined following functions:<\/p>\n
    1. Click(num):<\/strong> this function takes a numeric parameter. It first converts num to string and then the function appends the string to op and displays final value of op in input area of the calculator.<\/p>\n
    2. evaluate():<\/strong> This function is executed everytime the user clicks \u201c=\u201d i.e. when we need to evaluate the equation. Eval() is an inbuilt function in python which takes a string argument (equation) and returns a string (the output of the equation).<\/p>\n
    So this function just calls eval method and displays the output.<\/p>\n
    3. clearDisplay():<\/strong> It just clears the input area.<\/p>\n
    Then we have just created an entry box to display input and output. And then finally the twelve buttons (0-9,+,-,*,\/,=,C)<\/p>\n
    0-9,+,-,*,\/, calls \u2018click()\u2019 when clicked.<\/p>\n
    C calls \u2018clearDisplay()\u2019.<\/p>\n
    = calls \u2018evaluate()\u2019<\/p>\n
    Calculator Program Output:<\/h4>\n
    \"python<\/a><\/p>\n
    Summary<\/h2>\n
    We have successfully developed Python calculator project, with basic concepts of Python and Tkinter.<\/p>\n","protected":false},"excerpt":{"rendered":"
    In today’s era, everyone wants to become a python expert, but how? The answer is to work on projects. In this article, TechVidvan presents a python project for beginners – Simple Calculator, so let’s...<\/p>\n","protected":false},"author":1,"featured_media":80071,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1053],"tags":[3314,3315,483],"class_list":["post-80066","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-python","tag-calculator-project","tag-python-calculator","tag-python-project"],"yoast_head":"\nPython Calculator - Create a Calculator using Python - TechVidvan<\/title>\n<meta name=\"description\" content=\"Python Calculator - Create a simple calculator using Python. 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