Python 3.3+ comes with venv built-in — no need to install anything else.

🚀 Step-by-Step Instructions¶

🔹 Step 1: Create a Virtual Environment¶

Navigate to your project folder:

cd path/to/your/project

Then run:

python -m venv venv

This creates a folder called venv/ with a self-contained Python environment.

🔹 Step 2: Activate the Environment¶

🪟 On Windows:¶

venv\Scripts\activate

🐧 On Linux/macOS:¶

source venv/bin/activate

✅ You'll know it's activated if your terminal prompt starts with:

(venv)

🔹 Step 3: Install Dependencies¶

Once activated, install your packages using pip:

pip install numpy pandas matplotlib

🔹 Step 4: Freeze Your Environment (Optional)¶

Save current packages to a file:

pip freeze > requirements.txt

To recreate the environment later:

pip install -r requirements.txt

🔹 Step 5: Deactivate the Environment¶

When you're done:

deactivate

🧠 Bonus Tips¶

✅ TL;DR Cheat Sheet¶

# Create environment
python -m venv venv

# Activate (Linux/macOS)
source venv/bin/activate

# Activate (Windows)
venv\Scripts\activate

# Install packages
pip install -r requirements.txt

# Deactivate
deactivate