Introduction to Python

Python is a high-level, interpreted programming language — "interpreted" means you don't compile it into a separate binary first; the Python interpreter reads your .py file and runs it directly, line by line. That's why you can write a script and run it in seconds, which is a big part of why it's the default choice for scripting, data science, automation, and backend web development (including the CodeWithMunnaX channel's own backend demos).

Your first program

print("Hello, CodeWithMunnaX!")

Save this as hello.py and run it with python hello.py (or python3 hello.py on systems where python still points to Python 2). print() is a built-in function — you're calling it with one argument, the text to display.

Comments

Anything after # on a line is ignored by the interpreter — comments exist purely for humans reading the code.

# This is a single-line comment
print("This runs")  # comments can also trail after code

"""
This is a multi-line string.
When it's not assigned to anything, it's often used as a
multi-line comment or a docstring at the top of a function/class.
"""

Indentation is syntax, not style

Most languages use { } to mark a block of code. Python uses indentation — consistent whitespace at the start of a line. Mixing tabs and spaces, or indenting inconsistently, is a syntax error, not just a style complaint.

if True:
    print("This is inside the if block")
    print("So is this")
print("This is outside the if block")

The convention (PEP 8, Python's official style guide) is 4 spaces per indentation level — that's also what this playground's editor inserts when you press Tab.