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Installation of Python and PyCharm Step 1: Install Python Python is widely used for development, automation, and data science. Windows: Download from Python.org. Run the installer, check "Add Python to PATH", and install. Verify via Command Prompt: python --version macOS: Install via Terminal: brew install python Verify: python3 --version Linux (Ubuntu/Debian): Install via Terminal: sudo apt update && sudo apt install python3 Verify: python3 --version Step 2: Install PyCharm Windows & macOS: Download from JetBrains PyCharm. Install and configure settings. Launch and create a new project. Linux: Install via Terminal: sudo snap install pycharm-community --classic Configure PyCharm with Python Open PyCharm: File > Settings > Project: Interpreter. Add Interpreter and select your Python installation. You're now ready to code in Python with PyCharm!

Python Files and Modules Python organizes code using files (.py) and modules. Python Files Contain executable Python code. Can be imported into other scripts. Example (my_script.py): python Copy Edit def greet(): print("Hello from Python!") Python Modules Reusable files with functions and classes. Imported using import. Example: python Copy Edit import my_script my_script.greet() Built-in modules like math, random, and os add extra functionalities. Example: python Copy Edit import math print(math.sqrt(25)) Files and modules improve code organization and reusability.

Interactive Mode vs. Script Mode in Python Python has two ways to run code: Interactive Mode (REPL) – Executes commands line by line, great for quick testing. No file needed, runs in Python shell. Best for small code snippets and debugging. Example: python Copy Edit >>> print("Hello") Hello Script Mode – Runs a saved .py file all at once. Suitable for larger programs and automation. Code is stored and reusable. Example: python Copy Edit # script.py print("Hello from Script Mode!") Run with: python script.py Key Differences: Interactive Mode: Instant execution, no file needed. Script Mode: Saves code, runs the whole program. Use Interactive Mode for testing and learning, and Script Mode for real projects.

Python Syntax & Indentation Python uses clean syntax and indentation instead of {} for code blocks. Case Sensitive: variable and Variable are different. Statements: New line for each; use ; for multiple in one line. Comments: # for single-line, ''' or """ for multi-line. Variables: No type declaration needed; Python assigns types dynamically. Indentation (typically 4 spaces) is required. Inconsistent spacing causes errors. python Copy Edit if True: print("Indented correctly") Python’s indentation ensures readability and clean coding.

How Python Works Python scripts are plain text files with a .py extension. Interactive Shell: Open a terminal and type python or python3 to run commands in real-time. Writing Scripts: Use an editor like VS Code, PyCharm, or Jupyter Notebook. Running Scripts: Open a terminal, navigate to the script’s directory, and run: sh Copy Edit python script_name.py Python is simple for beginners yet powerful for advanced developers.