Python Intro

• Install Python from https://python.org/
• Install VS Code from https://code.visualstudio.com/
• Install Python extension in VS Code from [Marketplace] (https://marketplace.visualstudio.com/items?itemName=ms-python.python)

Check Python Installation

python --version

Python Command Line

C:\Users\Your Name>python

# or 

C:\Users\Your Name>py


C:\Users\Your Name>python
Python 3.13.5 (tags/v3.13.5:6cb20a2, Jun 11 2025, 16:15:46) [MSC v.1943 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> print("Hello, World!")

To quit the python command line interface:

exit()

Python Syntax

Python syntax can be executed by writing directly in the Command Line:

>>> print("Hello, World!")
Hello, World!

Or by creating a python file on the server, using the .py file extension, and running it in the Command Line:

C:\Users\Your Name>python myfile.py

Check the Python version of the editor:

import sys

print(sys.version)

Python Comments

#This is a comment
print("Hello, World!")

print("Hello, World!") #This is a comment


#This is a comment
#written in
#more than just one line
print("Hello, World!")


# Since Python will ignore string literals that are not assigned to a variable, you can add a multiline string (triple quotes) in your code, and place your comment inside it:

# As long as the string is not assigned to a variable, Python will read the code, but then ignore it, and you have made a multiline comment.

"""
This is a comment
written in
more than just one line
"""
print("Hello, World!")

Python Indentation

Indentation refers to the spaces at the beginning of a code line.

Where in other programming languages the indentation in code is for readability only, the indentation in Python is very important.

Python uses indentation to indicate a block of code.

if 5 > 2:
  print("Five is greater than two!")

Python will give you an error if you skip the indentation:

# SYNTAX ERROR
if 5 > 2:
print("Five is greater than two!")

The number of spaces is up to you as a programmer, the most common use is four, but it has to be at least one.

# SINGLE space for indentation
if 5 > 2:
 print("Five is greater than two!") 

# FOUR spaces for indentation
if 5 > 2:
        print("Five is greater than two!") 

You have to use the same number of spaces in the same block of code, otherwise Python will give you an error:

# SYNTAX ERROR
if 5 > 2:
 print("Five is greater than two!")
        print("Five is greater than two!")