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Building a User-Friendly GUI Calculator with Tkinter in Python

Creating a GUI Calculator using Tkinter

Are you interested in creating a graphical user interface(GUI) calculator using Python? Look no further! In this article, we will cover how to create a GUI calculator using the Tkinter library, define functions for the calculator, and customize the calculator’s various features.

Let’s get started!

Installing Tkinter library for Python

Before we proceed, it is essential to know that the Tkinter library is available by default when you install Python. However, if you do not have the Tkinter library for Python, you can easily install it using pip.

To install Tkinter using pip, open your command prompt and type in the following command:

pip install Tkinter

Using Messagebox widget in Tkinter

In Tkinter, the Messagebox widget is used to display a message to the user. This widget is beneficial in situations where you need to communicate with the user and get their feedback.

To use the Messagebox widget, import it from Tkinter and call the showinfo method, which will display the message to the user.

Setting up the label formatting

The label widget gives users the ability to display text or images inside the window. In the GUI calculator, we would like to display the numbers typed into the calculator.

Therefore, we will use the Label widget to create a text label. One of the significant aspects of using the Label widget is its formatting.

By default, the label does not have any formatting; therefore, we need to configure it. There are various properties to configure for the Label widget.

One of them is the font size, which we can set using the font attribute.

Packing the buttons on the window

The packing of widgets is the process of placing them in positions within the window. In Tkinter, the Pack() method is used to position the elements.

In the GUI calculator, we will use the Pack() method for the buttons. The Pack() method has some parameters that you can use to set the position and size of the widget.

Adding Buttons to GUI Calculator using Tkinter

In creating the GUI calculator, adding buttons is a crucial step. We want to create a panel with buttons that when clicked, display the desired output.

Tkinter provides several in-built buttons, and adding them to the calculator is straightforward.

Defining Functions for GUI Calculator in Tkinter

The GUI calculator needs to have several functions defined for it to work correctly. In this section, we will cover the essential functions required for the GUI calculator to be functional.

Defining btn_1_isclicked()function

One function required for the GUI calculator is the function that gets called when the user clicks on the button labeled 1. This function will display the number one on the calculator’s display screen.

Defining the function btn_1_isclicked() is straightforward. We can use the configure method to set the appropriate value.

Defining similar functions for other number buttons

After defining the function that gets called when the user clicks on button 1, we will need to define similar functions for buttons 2 through 9. All functions should follow the same format as the previous one, so defining these functions should be relatively easy.

Defining operator buttons functions

Lastly, we will need to define functions for the operator buttons. In Python, the operator buttons should contain a function that performs the required operations when clicked.

These operations include addition, subtraction, multiplication, division, and calculating the total.

In conclusion, creating a graphical user interface calculator using Tkinter library for Python is relatively easy.

With the appropriate functions defined, you can create a calculator that performs all the essential calculations. We hope this article has provided you with some insight into how to create your own GUI calculator using Tkinter in Python.

Happy coding!

Creating the window for GUI Calculator using Tkinter

Graphical user interfaces are essential in modern software development. They are used to provide user-friendly interfaces for applications, including calculators.

In this section, we will discuss how to create a GUI calculator window using the Tkinter library in Python.

Initializing Tkinter and creating a Tk root widget

Before we can start creating our GUI calculator, we first need to initialize the Tkinter library and create a Tk root widget to hold our interface. To do so, we use the following code:


import tkinter as tk

root = tk.Tk()


The above code imports the Tkinter module and creates a new root widget that will hold our interface.

Setting geometry of the window and disabling the resize option

The next step is to set the window geometry, which refers to the size of the window. We can do this using the geometry method of our Tk root widget.

We can also disable the ability to resize the window using the resizable method:



root.resizable(False, False)


The above code sets the size of the window to 300 pixels by 400 pixels and then disables the ability to resize the window.

Giving title to the calculator window

Now that we have set the size and disabled the ability to resize the window, it is time to give our calculator window a title. This can be achieved by using the title method:




The above code sets the window title to “Calculator.”

Setting up the label formatting

Now that we have our window set up, it’s time to set up the calculator’s interface. One of the essential components of this interface is the display box, which shows the numbers and results entered into the calculator.

We can use the Label widget in Tkinter to create a display box.

Using Label as a display box and using StringVar to manage text

The Label widget in Tkinter is often used for text-based output, such as the calculator display box. To use the Label widget as the display box, we first need to create a StringVar object to manage the text that will be displayed in the box.

We can do this by using the StringVar method and passing the root widget as an argument:


display_text = tk.StringVar(root)


The above code creates a new StringVar object called display_text, which will manage the text in our display box. We can now add the Label widget to our calculator interface, passing the display_text StringVar as an argument so that it manages the text in the Label widget:


display = tk.Label(root, textvariable=display_text)



The above code creates a new Label widget called display and passes the display_text StringVar as an argument to manage its text.

Finally, it packs the widget onto the window.

Controlling the Anchor option to position text in the label

By default, the text in our display box will be aligned to the left and positioned at the top of the box. However, we can control the position of the text using the Anchor option of the Label widget.

The Anchor option determines where the text will be positioned within the Label widget.

We can use the Anchor option to center the text in our display box by setting it to “center.” We can do this by adding the “anchor” option to the creation of our display Label widget:


display = tk.Label(root, textvariable=display_text, anchor=’center’)



The above code sets the anchor option of the Label widget to “center,” which centers the text in the display box.

In conclusion, creating a GUI calculator’s window is essential because it acts as the container for all the different widgets and features involved in creating a functional calculator. In this section, we discussed how to create the window using Tkinter library in Python, how to set the geometry and title of the window and how to set up the label formatting with the Anchor option.

Overall, the user experience of the calculator is significantly improved when the window is visually appealing and easy to navigate, and this is something that we have been able to cover in this section.

Packing the buttons on the window

After creating the window and setting up the label formatting, the next crucial step in creating a GUI calculator is to add the necessary buttons. To achieve this, we will need to use the Frame widget, which will function as a container to arrange other widgets like buttons.

Using Frame as a widget and container to arrange other widgets

The Frame widget in Tkinter is an invisible container that can hold one or more widgets. Frames are used to partition widgets into groups and are useful in improving the organization and clarity of the interface.

In creating the GUI calculator, you can use frames to group the different types of calculator buttons.

To add a frame to the calculator layout, follow this code portion:


button_frame = tk.Frame(root)



The code above creates a new frame called “button_frame” and packs it into the root window.

Note that the frame’s packing is crucial in determining the position of the frame and the widgets it contains.

Adding four frames to divide the calculator layout

To create a standard calculator layout, it is best to split the user interface into four frames, each representing a different calculator section. These frames will hold the buttons for the corresponding section of the calculator.

The four frames are:

– The top frame, which will contain the display box

– The left frame, which will contain the number buttons

– The right frame, which will contain the operator buttons

– The bottom frame, which will contain the clear and equals buttons

To add these frames, start with the top frame:


top_frame = tk.Frame(root)



The top_frame pack attribute specifies the packing order at the top.

Add this code portion to create the left frame:


left_frame = tk.Frame(root)



Add this code portion to create the right frame:


right_frame = tk.Frame(root)



Finally, add this portion to create the bottom frame:


bottom_frame = tk.Frame(root)



The above four frames make up the basic layout of a standard calculator interface designed for easy user experience.

Using Pack option to manage the size and position of frames

Once we have all four frames in place, we need to use the Pack option to manage the size and position of each frame and its contents. Using Pack, we can specify which side of the frame or window the widget should be attached to and how the widget should be sized concerning other widgets.

For instance, this code portion adds the clear button to the bottom frame:


clear_button = tk.Button(bottom_frame, text=”C”, width=5)

clear_button.pack(side=tk.LEFT, padx=5, pady=5)


In the code above, we created a new Button widget called clear_button and packed it into the bottom frame. The parameters for Pack include the “side” option that specifies the side of the frame, followed by “padx” and “pady” options that determine the button’s padding.

Adding buttons to frames using Button widget

To create a GUI calculator with working controls, we need to add various buttons to the four frames. We use the Button widget in Tkinter to create buttons.

To add a button, follow this code portion:


button_name = tk.Button(frame_name, text=”button_text”, command=function_name, width=5, height=5)

button_name.pack(side=tk.LEFT, padx=5, pady=5)


This code creates a new Button widget named button_name and packs it into a specified frame called frame_name. The widget’s ‘text’ option specifies the text that will appear on the button, and the ‘command’ option assigns the function that will be called when the button is clicked.

In conclusion, adding buttons to our calculator GUI is an essential component of the application. It determines the calculators usefulness and its user experience.

Frames are an excellent tool in creating an organized layout and improving usability. Understanding the Pack option and Button widget in Tkinter makes creating a calculator more accessible and more enjoyable to use.

In this section, we discussed how to use the Frame widget, how to add four frames to a calculator layout to divide it, use Pack option to manage the size and position of frames, and add buttons to frames using Button widget. In conclusion, creating a GUI calculator using the Tkinter library is a fun and straightforward task once you have learned the basics of the library.

This article has provided an overview of creating the calculator window, setting up the label formatting, using frames as a widget and container to arrange other widgets, adding buttons to frames, and defining functions for the GUI calculator. All these aspects are essential in creating an effective calculator that is easy to use and navigate.

The takeaways from this article include understanding the different functionalities of the Tkinter library and how to use them to create a functional calculator interface. With this knowledge, you will be able to create GUI calculators that are both useful and visually appealing.

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