SRJahirTech

Python Full Tutorial — Part 12

Professional Python projects never use global dependencies. They use virtual environments.

1. What is pip?

pip install requests
  

2. What is a Virtual Environment?

An isolated Python environment per project.

3. Creating a Virtual Environment

python -m venv venv
  

4. Activating Environment

# Windows
venv\Scripts\activate

# Linux / macOS
source venv/bin/activate
  

5. Installing Packages Inside venv

pip install flask
  

6. requirements.txt

flask
requests
  

pip install -r requirements.txt
  

7. Why This Matters

• No dependency conflicts
• Clean deployments
• Industry standard

Key Takeaway

If you skip virtual environments, you are not ready for production Python.

Next step: Mini Project using everything learned