Calculator App using Python Tkinter - part 2 | GUI Programming with Python Training Course | Uplatz смотреть онлайн

This video by Uplatz demonstrates a step-by-step process of how to create a Calculator App using Python Tkinter. It is part-2 of the four part series. https://training.uplatz.com/online-it-course.php?id=gui-programming-in-python-using-tkinter-231

Python Tkinter is a standard GUI (Graphical User Interface) toolkit for Python. It provides a set of tools and widgets that allow developers to build desktop applications with a graphical user interface. Tkinter is included with most Python installations and does not require any additional installation.

An example of a simple calculator app built with Python Tkinter:

import tkinter as tk

class Calculator:
def __init__(self, master):
self.master = master
self.master.title("Calculator")

self.display_var = tk.StringVar()
self.display_var.set("0")

self.display = tk.Label(master, textvariable=self.display_var, font=("Arial", 24), width=15, height=2, anchor="e")
self.display.grid(row=0, column=0, columnspan=4, padx=10, pady=10)

self.create_button("7", 1, 0)
self.create_button("8", 1, 1)
self.create_button("9", 1, 2)
self.create_button("/", 1, 3)
self.create_button("4", 2, 0)
self.create_button("5", 2, 1)
self.create_button("6", 2, 2)
self.create_button("*", 2, 3)
self.create_button("1", 3, 0)
self.create_button("2", 3, 1)
self.create_button("3", 3, 2)
self.create_button("-", 3, 3)
self.create_button("0", 4, 0)
self.create_button(".", 4, 1)
self.create_button("C", 4, 2)
self.create_button("+", 4, 3)

self.create_button("=", 5, 0, columnspan=4)

def create_button(self, text, row, column, columnspan=1, rowspan=1):
button = tk.Button(self.master, text=text, font=("Arial", 16), width=4, height=2,
command=lambda: self.button_click(text))
button.grid(row=row, column=column, columnspan=columnspan, rowspan=rowspan, padx=5, pady=5)

def button_click(self, text):
if text == "C":
self.display_var.set("0")
elif text == "=":
try:
result = eval(self.display_var.get())
self.display_var.set(str(result))
except:
self.display_var.set("Error")
else:
if self.display_var.get() == "0":
self.display_var.set(text)
else:
self.display_var.set(self.display_var.get() + text)

root = tk.Tk()
app = Calculator(root)
root.mainloop()

This calculator app has a simple layout with buttons for numbers, operators, and a clear button. It uses the eval() function to evaluate the mathematical expression entered by the user and display the result. Note that using eval() can be a security risk in some cases, so it is important to validate user input before evaluating it.

The main components of a Tkinter application are windows, frames, buttons, labels, text boxes, and other widgets. These widgets can be organized in a hierarchical structure to create complex user interfaces. Tkinter also provides support for event-driven programming, which allows developers to write code that responds to user actions such as button clicks and mouse movements.

One of the main advantages of Tkinter is its simplicity and ease of use. It has a small learning curve and is easy to understand for developers who are new to GUI programming. Tkinter also provides good cross-platform support, which means that applications built with it can run on different operating systems such as Windows, Mac OS, and Linux.

Tkinter is a great choice for developers who want to build simple and straightforward desktop applications with a graphical user interface using Python. Its simplicity and cross-platform support make it a popular choice for beginners and experienced developers alike.

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