Avoid these 6 Python mistakes for beginners

Python basics - Day 17 Day 17 – Variable Scope \(Local, Global, and Nonlocal\) Project: Build a “Counter Tracker” app that explores how variable scopes behave. 01. Learning Goal By the end of this lesson, you will be able to: Understand how local, global, and nonlocal variables work Recognize variable visibility inside and outside functions Use the global and nonlocal keywords correctly Apply the LEGB rule to predict variable access order 02. Problem Scenario You are creating a small program that counts how many times a function is called. While doing so, you notice that some variables disappear or don’t update as expected. Let’s explore scope — the concept that controls where variables can be accessed. 03. Step 1 – Local Variables Variables declared inside a function exist only during that function’s execution. def show\_number\(\): x = 10 # Local variable print\("Inside function:", x\) show\_number\(\) # print\(x\) # Error! \(x is not defined outside\) When the function ends, the local variabl https://lnkd.in/gPeZ_Qg3

Python basics - Day 14 Day 14 – Exception Handling \(try / except\) Project: Build a “Safe Calculator” that handles user input errors gracefully. 01. Learning Goal By the end of this lesson, you will be able to: Understand what exceptions \(errors\) are in Python Handle errors using try and except blocks Use else and finally for structured control flow Prevent your program from crashing unexpectedly 02. Problem Scenario When users input wrong data or when files are missing, your program crashes. Your goal today is to handle exceptions safely and ensure the app continues running smoothly. 03. Step 1 – What is an Exception? An exception occurs when something goes wrong during execution. If not handled, it will stop the program. print\(10 / 0\) # ZeroDivisionError numbers = \[1, 2, 3\] print\(numbers\[5\]\) # IndexError Examples of common errors: Division by zero Accessing an invalid index File not found 04. Step 2 – Basic try / except Structure try: # Code that may cause an error except: # Code t https://lnkd.in/gKJNQxnj

🚀 Mastering Python’s os Module — The Power Behind File & System Operations 💻🐍 The os module in Python helps you interact with your operating system — from handling files and directories to managing environment variables. Here are some commonly used os functions you should know 👇 🔹 File & Directory Operations os.getcwd() → Get current working directory os.chdir(path) → Change current directory os.listdir(path) → List files and folders os.mkdir(path) → Create a directory os.makedirs(path) → Create nested directories os.rmdir(path) → Remove an empty directory os.remove(path) → Delete a file os.rename(src, dst) → Rename a file or directory 🔹 Path Handling (with os.path) os.path.join(a, b) → Join paths os.path.exists(path) → Check if path exists os.path.isfile(path) → Check if it's a file os.path.isdir(path) → Check if it's a directory os.path.getsize(path) → Get file size 🔹 Environment & System Info os.name → Get OS name ('posix', 'nt', etc.) os.environ → Access environment variables os.getlogin() → Get current logged-in user os.getpid() → Get current process ID os.cpu_count() → Get number of CPU cores 🔹 Running System Commands os.system('command') → Run shell commands os.startfile('filename') (Windows only) → Open files or programs

#CodSoft #Task04 Contact Book using python in google colab The Contact Book developed in Python is an interactive application that lets users store, manage, and search personal or professional contacts efficiently. Users can add new contacts with details such as name, phone number, email, and address, and can update or delete existing entries as needed. The program typically allows for searching through contacts by name or number, displaying results instantly, and is built with a simple text-based or graphical interface for ease of use. This project showcases important programming concepts such as file handling or data structures (like dictionaries or lists), user input processing, and menu-driven logic, making it an excellent learning resource for beginners and intermediate Python learners.

Python basics - Day 15 Day 15 – Functions \(def, return, parameters\) Project: Build a “Simple Calculator” using user-defined functions 01. Learning Goal By the end of this lesson, you will be able to: Define and call your own functions using def Pass values into functions using parameters Return results using return Understand default parameters and multiple return values 02. Problem Scenario You often repeat the same code for arithmetic operations. Your goal is to modularize your code by creating reusable functions to handle these tasks. 03. Step 1 – What is a Function? A function is a reusable block of code that performs a specific task. You must define it first, then call it. def say\_hello\(\): print\("Hello!"\) say\_hello\(\) # Function call 04. Step 2 – Using Parameters Functions can receive data through parameters. def greet\(name\): print\(f"Nice to meet you, \{name\}!"\) greet\("Sabin"\) # Nice to meet you, Sabin! 05. Step 3 – Returning Values Functions can return results using return. d https://lnkd.in/gaNeANZr