Introduction to Python

1. What is Python?

Python is a high-level, interpreted programming language known for its clear syntax and readability. Unlike low-level languages like C++ or Assembly, Python code is compiled at runtime by an interpreter, which reads and executes instructions line by line. This makes the language highly portable and easy to debug, but slightly slower for raw execution. Python is widely used in web development, data analysis, scripting, artificial intelligence, and automation.

2. How Python Runs Code

To run Python on your computer, you need to download and install the Python runtime from the official python.org website. Python can be executed in two main ways:

• Interactive REPL (Read-Eval-Print Loop): By typing python or python3 in your command terminal, you open a live environment where every line of code you write is executed immediately. This is great for testing and quick experimentation.
• Script Mode: For real applications, you write your code in text files ending with the .py extension (e.g., hello.py), and then run the whole script from your terminal using: python hello.py.

3. Syntax and Your First Script

Python values simplicity. To display output to the screen, we use the built-in print() function. Strings (text) must be enclosed inside double or single quotes. Multi-line comments or descriptions can be written, but for single-line notes, Python uses the # symbol.

# This is a comment. The interpreter ignores it.
print("Hello, Infotris!")  # Prints text to console

# Multiple arguments can be separated by commas
print("Welcome to", "Python", 3.12)

4. Common Beginner Mistakes

Interactive Practice

Mini Practice: Run Your First Code

Write a script locally, save it as intro.py, run it in your terminal, and confirm the steps. Copy the printed output to check it.

0% complete

Write your code here (Scratchpad)

Paste what your terminal printed Check my output

Check when done

I installed Python on my system I created an intro.py file and ran it My script printed the message successfully

Quiz

Test Your Understanding

1. What kind of language is Python primarily considered?

Low-level, compiled machine language High-level, interpreted language Hardware assembly macro script

2. How is a comment written in Python?

// Comment here # Comment here <!-- Comment -->

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