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pypa logovirtualenv

Virtual Python Environment builder

4,796
1,025
4,796
25

Top Related Projects

38,567

Simple Python version management

6,333

A system-level, binary package and environment manager running on all major operating systems and platforms.

Python extension for Visual Studio Code

10,032

Install and Run Python Applications in Isolated Environments

Quick Overview

Virtualenv is a tool for creating isolated Python environments. It allows you to create a separate Python environment for each project, ensuring that dependencies and packages for different projects don't interfere with each other. This is particularly useful for managing projects with conflicting dependencies or for testing applications in different Python versions.

Pros

  • Isolates project dependencies, preventing conflicts between different projects
  • Allows easy testing of applications across different Python versions
  • Lightweight and easy to use
  • Integrates well with pip for package management

Cons

  • Can be confusing for beginners who are new to Python environment management
  • Requires manual activation and deactivation of environments
  • May lead to increased disk space usage due to multiple copies of packages
  • Slightly slower than using system-wide Python installations

Code Examples

  1. Creating a new virtual environment:
python -m venv myenv

This creates a new virtual environment named "myenv" in the current directory.

  1. Activating the virtual environment (on Unix-based systems):
source myenv/bin/activate

This activates the virtual environment, allowing you to use its isolated Python installation.

  1. Installing packages in the virtual environment:
pip install requests

This installs the "requests" package in the active virtual environment.

  1. Deactivating the virtual environment:
deactivate

This command returns you to the system-wide Python installation.

Getting Started

To get started with virtualenv:

  1. Install virtualenv (if not already installed):

    pip install virtualenv
    
  2. Create a new virtual environment:

    python -m venv myproject_env
    
  3. Activate the virtual environment:

    • On Windows: myproject_env\Scripts\activate
    • On Unix or MacOS: source myproject_env/bin/activate
  4. Install project dependencies:

    pip install -r requirements.txt
    
  5. Work on your project within the activated environment.

  6. When finished, deactivate the environment:

    deactivate
    

Competitor Comparisons

38,567

Simple Python version management

Pros of pyenv

  • Manages multiple Python versions on a single system
  • Allows switching between Python versions globally or per-project
  • Integrates well with other tools like pyenv-virtualenv for environment management

Cons of pyenv

  • Requires more setup and configuration compared to virtualenv
  • Limited to Unix-like systems (not natively supported on Windows)
  • May have conflicts with system-wide Python installations

Code Comparison

pyenv:

pyenv install 3.9.0
pyenv global 3.9.0
python --version

virtualenv:

python -m venv myenv
source myenv/bin/activate
python --version

pyenv focuses on managing multiple Python versions, while virtualenv creates isolated environments for a single Python version. pyenv is more suitable for developers working with multiple Python versions across projects, whereas virtualenv is simpler for creating isolated environments within a single Python version.

Both tools can be used together, with pyenv managing Python versions and virtualenv creating isolated environments within those versions. The choice between them depends on specific project requirements and development workflows.

6,333

A system-level, binary package and environment manager running on all major operating systems and platforms.

Pros of conda

  • Manages both Python and non-Python dependencies
  • Supports multiple programming languages (not just Python)
  • Provides pre-built binaries for many packages, speeding up installation

Cons of conda

  • Larger installation size and slower initial setup
  • Can be more complex to use for simple Python-only projects
  • May have conflicts with system-wide Python installations

Code comparison

virtualenv:

python -m venv myenv
source myenv/bin/activate
pip install package_name

conda:

conda create -n myenv python=3.8
conda activate myenv
conda install package_name

Summary

While virtualenv focuses solely on Python environments, conda offers a more comprehensive solution for managing dependencies across multiple languages. conda excels in handling complex scientific computing environments but may be overkill for simple Python projects. virtualenv provides a lightweight, Python-specific solution that integrates seamlessly with pip. The choice between the two depends on project requirements, with conda being particularly useful for data science and scientific computing projects that involve multiple languages and complex dependencies.

Python extension for Visual Studio Code

Pros of vscode-python

  • Integrated development environment with rich features for Python development
  • Seamless debugging and IntelliSense support
  • Active development and frequent updates from Microsoft

Cons of vscode-python

  • Larger resource footprint compared to lightweight virtualenv
  • Steeper learning curve for users new to IDEs
  • Dependency on Visual Studio Code editor

Code Comparison

virtualenv:

# Creating a virtual environment
python -m venv myenv

# Activating the environment
source myenv/bin/activate  # On Unix or MacOS
myenv\Scripts\activate.bat  # On Windows

vscode-python:

// settings.json
{
    "python.pythonPath": "/path/to/python",
    "python.linting.enabled": true,
    "python.formatting.provider": "autopep8"
}

While virtualenv focuses on creating isolated Python environments, vscode-python provides a comprehensive development experience within Visual Studio Code. virtualenv is more lightweight and flexible, suitable for various workflows, whereas vscode-python offers a feature-rich environment specifically tailored for VS Code users. The choice between them depends on individual preferences and project requirements.

10,032

Install and Run Python Applications in Isolated Environments

Pros of pipx

  • Simplifies installation and management of Python applications in isolated environments
  • Allows running Python applications without activating virtual environments
  • Provides easy access to CLI tools across different projects

Cons of pipx

  • Limited to installing applications, not suitable for managing project dependencies
  • May require more disk space due to separate environments for each application
  • Less flexible for complex development workflows compared to virtualenv

Code comparison

pipx:

pipx install package_name
pipx run package_name

virtualenv:

python -m venv myenv
source myenv/bin/activate
pip install package_name
package_name

Summary

pipx is designed for simplifying the installation and usage of Python applications, making it ideal for end-users and developers who frequently use CLI tools. It provides a more streamlined experience for running Python applications without the need to manage virtual environments manually.

virtualenv, on the other hand, offers more flexibility and control over environment management, making it better suited for development workflows and managing project-specific dependencies. It allows for fine-grained control over package versions and is widely used in development environments.

Choose pipx for easy installation and usage of Python applications, and virtualenv for more comprehensive environment management in development projects.

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README

virtualenv

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A tool for creating isolated virtual python environments.

Code of Conduct

Everyone interacting in the virtualenv project's codebases, issue trackers, chat rooms, and mailing lists is expected to follow the PSF Code of Conduct.