🚀 Open Python

Python can be used in several ways depending on your environment. Below are the most common options.

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🖥️ Option 1 — Local Computer (Terminal / Command Line)

🪟 Windows

Open Command Prompt
(Press Windows key → type cmd → Enter)

🍎 Mac

Open Terminal
(Applications → Utilities → Terminal)

🐧 Linux

Open Terminal
(You already know the drill 😄)

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▶️ Start Python Interactive Mode (REPL)

The interactive mode lets you execute Python commands one by one.

python3

You should see something like:

>>>

That means Python is running and ready.

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📜 Run a Python Script File

If you have a file such as my_file.py:

python3 my_file.py

Python will execute the entire script.

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❌ Exit Python Interactive Mode

exit()

You can also press:

Ctrl + D   (Mac / Linux)
Ctrl + Z + Enter   (Windows)

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☁️ Option 2 — Google Colab (No Installation ⚡)

If you want to start coding immediately without installing anything, you can use Google Colab.

Colab runs Python in the cloud inside your browser.

✅ Advantages

• 🚀 Zero installation
• 💻 Works on any device
• 📦 Libraries pre-installed (NumPy, Pandas, Matplotlib…)
• 🤖 GPU support available
• 📓 Notebook style (great for experiments and learning)

▶️ How to Start

1. Go to: https://colab.research.google.com
2. Click New Notebook
3. Start writing Python code:

print("Hello, world!")

Press Shift + Enter to run the cell.

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🧠 When to Use Each Option

Situation	Best Choice
Learning basics quickly	☁️ Colab
Data science / experiments	☁️ Colab
Offline development	🖥️ Local Python
Real projects / scripts	🖥️ Local Python

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🧩 Mental Model

Python = Engine 🧠

Terminal → Direct control
Script file → Automated execution
Colab → Cloud laboratory ☁️

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✨ Recommendation for Beginners

Start with Colab for speed and simplicity, then move to local Python once you feel comfortable.

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