Which version of Python should I install?

Install Python 3.13 (the latest stable release as of 2026). Never install Python 2 — it reached end of life in 2020 and is no longer maintained. When you see tutorials referencing "Python 3", that's what you want.

Should I use Python or JavaScript for beginners?

Python is easier to read and has simpler syntax than JavaScript — it's a better first language for most beginners. JavaScript is the right choice if your goal is specifically web frontend development. Python is better for data science, AI/ML, automation, scripting, and backend APIs.

pip is Python's package manager — the tool you use to install libraries that other people wrote. For example, `pip install requests` gives you a library for making HTTP requests. `pip install pandas` gives you tools for working with data. Almost every Python project uses pip to install packages.

What is a virtual environment?

A virtual environment is an isolated Python installation for a specific project. It lets you install packages for one project without affecting another project (or your system Python). It's standard practice to create one for every new Python project.

Python Basics: How to Install Python and Write Your | explainx.ai Blog

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Python Basics: How to Install Python and Write Your | explainx.ai Blog | explainx.ai

Python is the most-used programming language in AI, data science, and automation. It's also widely considered the easiest language to learn first — the syntax is close to plain English and the feedback loop is immediate.

This guide gets you from nothing to a working Python setup with a real script in under 30 minutes.

Install Python and write your first scripts — full beginner walkthrough.

Step 1: Install Python

macOS

Check if Python is already installed:

bash

python3 --version

If you see Python 3.10 or higher, you can skip to Step 2. If not, or if you want the latest version:

Option A — Homebrew (recommended):

bash

brew install python

If you don't have Homebrew, install it first:

bash

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

Option B — Official installer:

Go to python.org/downloads
Download the latest Python 3.13.x macOS installer
Run the .pkg file and follow the installer

After installation:

bash

python3 --version

You should see Python 3.13.x.

Windows

Go to python.org/downloads
Download Python 3.13.x (Windows installer)
Run the installer
Important: Check the box that says "Add Python to PATH" before clicking Install

Open Command Prompt or PowerShell and verify:

bash

python --version

On Windows, the command is python (not python3). On Mac/Linux, use python3 to avoid accidentally using an old Python 2 installation.

Step 2: Install a code editor

If you haven't already, install Cursor or VS Code. Both have excellent Python support.

In VS Code or Cursor, install the Python extension by Microsoft — it adds syntax highlighting, autocomplete, and the ability to run Python files directly in the editor.

Step 3: Write and run your first script

Create a folder for your Python projects:

bash

mkdir python-projects
cd python-projects

Create your first Python file:

bash

# Mac/Linux
touch hello.py

# Windows
type nul > hello.py

Open hello.py in your editor and type:

python

print("Hello, Python!")

name = "Alice"
print(f"Hello, {name}!")

numbers = [1, 2, 3, 4, 5]
total = sum(numbers)
print(f"The sum of {numbers} is {total}")

Run it:

bash

# Mac/Linux
python3 hello.py

# Windows
python hello.py

Output:

snippet

Hello, Python!
Hello, Alice!
The sum of [1, 2, 3, 4, 5] is 15

The core concepts

Variables

Variables store values. No type declaration needed — Python figures it out:

python

name = "Alice"           # string
age = 28                 # integer
height = 5.7             # float
is_student = True        # boolean

print(name, age, height, is_student)

Strings and f-strings

python

first = "Alice"
last = "Smith"

# Concatenation (old way)
full = first + " " + last

# f-strings (modern way — preferred)
full = f"{first} {last}"
greeting = f"Hello, {first}! You are {age} years old."

print(greeting)

Lists

python

fruits = ["apple", "banana", "cherry"]

print(fruits[0])         # apple — indexing starts at 0
print(fruits[-1])        # cherry — last item

fruits.append("mango")   # add to end
fruits.remove("banana")  # remove by value

print(len(fruits))       # 3 — number of items

Dictionaries

python

person = {
    "name": "Alice",
    "age": 28,
    "city": "London"
}

print(person["name"])    # Alice
person["job"] = "Engineer"  # add a new key
print(person)

If / else

python

age = 20

if age >= 18:
    print("You are an adult")
elif age >= 13:
    print("You are a teenager")
else:
    print("You are a child")

For loops

python

fruits = ["apple", "banana", "cherry"]

for fruit in fruits:
    print(f"I like {fruit}")

# Loop over a range of numbers
for i in range(5):
    print(i)   # prints 0, 1, 2, 3, 4

# Loop with index
for i, fruit in enumerate(fruits):
    print(f"{i}: {fruit}")

Functions

python

def greet(name):
    return f"Hello, {name}!"

def add(a, b):
    return a + b

message = greet("Alice")
print(message)

result = add(3, 4)
print(result)    # 7

Functions with default parameters:

python

def greet(name, greeting="Hello"):
    return f"{greeting}, {name}!"

print(greet("Alice"))           # Hello, Alice!
print(greet("Bob", "Hi"))       # Hi, Bob!

Step 4: Set up a virtual environment

A virtual environment isolates your project's packages from the rest of your system. Always use one.

Create a virtual environment in your project folder:

bash

# Mac/Linux
python3 -m venv venv

# Windows
python -m venv venv

Activate it:

bash

# Mac/Linux
source venv/bin/activate

# Windows (Command Prompt)
venv\Scripts\activate.bat

# Windows (PowerShell)
venv\Scripts\Activate.ps1

When activated, your terminal prompt shows (venv) at the start:

snippet

(venv) user@machine:~/python-projects$

Everything you install now goes into this environment, not your system Python.

To deactivate when you're done:

bash

deactivate

Step 5: Install packages with pip

pip is Python's package installer. With your virtual environment active:

bash

pip install requests

This installs the requests library — the standard way to make HTTP calls in Python.

Test it:

python

import requests

response = requests.get("https://api.github.com")
print(response.status_code)   # 200
print(response.json()["current_user_url"])

Save your dependencies so others can replicate your environment:

bash

pip freeze > requirements.txt

To install from a requirements.txt on a new machine:

bash

pip install -r requirements.txt

Step 6: A real beginner project

Build a script that fetches today's weather for any city using a free API.

Install the requests library if you haven't:

bash

pip install requests

Create weather.py:

python

import requests

def get_weather(city):
    url = f"https://wttr.in/{city}?format=j1"
    response = requests.get(url)
    
    if response.status_code != 200:
        return f"Could not fetch weather for {city}"
    
    data = response.json()
    current = data["current_condition"][0]
    
    temp_c = current["temp_C"]
    feels_like = current["FeelsLikeC"]
    description = current["weatherDesc"][0]["value"]
    
    return f"{city}: {description}, {temp_c}°C (feels like {feels_like}°C)"

cities = ["London", "New York", "Tokyo", "Mumbai"]

for city in cities:
    print(get_weather(city))

Run it:

bash

python3 weather.py

You're fetching live data, parsing JSON, and printing formatted output — with less than 25 lines of code.

Common beginner mistakes

Not activating the virtual environment. If you install packages and they "don't work", check that (venv) is showing in your terminal prompt.

Using python vs python3. On Mac/Linux, always use python3. On Windows, python usually points to Python 3 if you installed it correctly.

Indentation errors. Python uses indentation (spaces) instead of curly braces to structure code. Mixing tabs and spaces causes errors. Use spaces consistently (4 spaces per indent is the standard).

Forgetting to save the file. Python runs whatever is on disk, not what's in your editor. Save before running.

What to learn next

File I/O — reading and writing files with open()
Error handling — try / except blocks
List comprehensions — [x * 2 for x in numbers] — a concise way to build lists
Classes — object-oriented programming with class
Common libraries — pandas for data, flask for web APIs, anthropic for Claude AI

The Anthropic Python SDK lets you call Claude from a Python script:

bash

pip install anthropic

python

import anthropic

client = anthropic.Anthropic()

message = client.messages.create(
    model="claude-sonnet-4-6",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Explain Python decorators simply."}]
)

print(message.content[0].text)

Python is the language most AI and ML work is written in — now you have the foundation to explore it.

Python Basics: How to Install Python and Write Your First Script (2026 Guide)

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Step 1: Install Python

macOS

Windows

Step 2: Install a code editor

Step 3: Write and run your first script

The core concepts

Variables

Strings and f-strings

Lists

Dictionaries

If / else

For loops

Functions

Step 4: Set up a virtual environment

Step 5: Install packages with pip

Step 6: A real beginner project

Common beginner mistakes

What to learn next