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Anubhav Sharma
Anubhav Sharma

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The Anubhav portal was launched in March 2015 at the behest of the Hon'ble Prime Minister for retiring government officials to leave a record of their experiences while in Govt service .

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Anubhav Sharma
Anubhav Sharma 21 Oct 2025
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A Python Virtual Environment (venv) is an isolated environment that allows you to install and manage Python packages independently from your system-wide Python installation. This helps prevent version conflicts between different projects.

Here’s a quick guide to understanding and using it:

Why Use a Virtual Environment?

Without a venv:

  • All packages are installed globally (shared by all projects).
  • Upgrading/downgrading a package may break other projects.

With a venv:

  • Each project has its own set of dependencies.
  • Safe to use different package versions in different projects.

How to Create and Use a Virtual Environment

1. Check Python Installation

python --version
# or sometimes
python3 --version

2. Create a Virtual Environment

python -m venv myenv
  • This creates a folder named myenv containing a private Python setup.
  • You can change myenv to any name you like.

3. Activate the Virtual Environment

Windows:

myenv\Scripts\activate

macOS/Linux:

source myenv/bin/activate

After activation, your terminal prompt will show:

(myenv) C:\project>

4. Install Packages Inside the venv

pip install requests

Check installed packages:

pip list

5. Freeze Dependencies (optional but important)

Save all installed packages to a file:

pip freeze > requirements.txt

Later, you can recreate the same environment with:

pip install -r requirements.txt

6. Deactivate the Virtual Environment

deactivate

Alternative Tools

Tool Description
venv Built into Python 3 — simple and lightweight
virtualenv Older but feature-rich; works for Python 2 & 3
pipenv Combines pip + venv + dependency locking
poetry Modern tool for dependency management and packaging
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