Simple GUI calculator using Tkinter

Creating a simple GUI calculator using tkinter is a fun way to get to know the library. Let's design a basic calculator with the standard operations: addition, subtraction, multiplication, and division.

Simple GUI Calculator Using `tkinter`:

1. Import Required Libraries:

import tkinter as tk

2. Logic for the Calculator:

Let's define basic functions for each operation:

def add(a, b):
    return a + b

def subtract(a, b):
    return a - b

def multiply(a, b):
    return a * b

def divide(a, b):
    if b == 0:
        return "Error (div by 0)"
    return a / b

3. Design the GUI:

def on_click(event):
    # Update the input field when a button is clicked
    text = event.widget.cget("text")
    if text == "=":
        try:
            result_str = str(eval(str(entry.get())))
            entry.delete(0, tk.END)
            entry.insert(tk.END, result_str)
        except Exception as e:
            entry.delete(0, tk.END)
            entry.insert(tk.END, "Error")
    elif text == "C":
        entry.delete(0, tk.END)
    else:
        entry.insert(tk.END, text)

root = tk.Tk()
root.title("Simple Calculator")

# Create the entry box
entry = tk.Entry(root, width=40, borderwidth=5)
entry.pack(padx=10, pady=10)

# Create button layout
buttons = [
    '7', '8', '9', '+',
    '4', '5', '6', '-',
    '1', '2', '3', '*',
    'C', '0', '=', '/'
]

# Create the buttons using a loop
current_row = 1
for btn in buttons:
    tk.Button(root, text=btn, width=10, height=2).grid(row=current_row, column=(buttons.index(btn) % 4))
    current_row += 1 if (buttons.index(btn) + 1) % 4 == 0 else 0

# Bind the buttons to the on_click function
for btn in buttons:
    widget = root.grid_slaves(row=current_row-1, column=buttons.index(btn) % 4)[0]
    widget.bind("<Button-1>", on_click)
    if current_row != 1 and (buttons.index(btn) + 1) % 4 == 0:
        current_row -= 1

root.mainloop()

The on_click function updates the input field when a button is clicked. When the "=" button is clicked, it tries to evaluate the expression in the input field. If it encounters an error, it displays "Error". The "C" button clears the input field.

This is a very basic calculator that only handles the standard operations. For more advanced operations, or to better handle input and operations (such as handling floats, integrating a "backspace" button, or incorporating scientific calculations), you can extend the above code and add more functionality.

Creating a basic calculator with Tkinter:

Description: This example covers the basic structure of a Tkinter-based calculator, including the main window, display area, and buttons for numbers and operations.

import tkinter as tk

# Create main window
root = tk.Tk()
root.title("Basic Calculator")

# Create display widget
display = tk.Entry(root, width=20, font=('Arial', 14))
display.grid(row=0, column=0, columnspan=4)

# Define button click function
def button_click(value):
    current = display.get()
    display.delete(0, tk.END)
    display.insert(0, current + value)

# Create number buttons
for i in range(1, 10):
    btn = tk.Button(root, text=str(i), command=lambda i=i: button_click(str(i)))
    btn.grid(row=(i-1)//3 + 1, column=(i-1)%3)

# Create operation buttons
operations = ['+', '-', '*', '/']
for i, op in enumerate(operations):
    btn = tk.Button(root, text=op, command=lambda op=op: button_click(op))
    btn.grid(row=i+1, column=3)

# Create equals button
equals_btn = tk.Button(root, text='=', command=lambda: button_click('='))
equals_btn.grid(row=4, column=0, columnspan=3)

# Run the main loop
root.mainloop()

Simple GUI calculator using Tkinter

Simple GUI Calculator Using tkinter:

Simple GUI Calculator Using `tkinter`: