A virtual environment is an isolated Python environment where you can install packages separately for each project.<\/p>\n\n\n\n
It helps you avoid conflicts between different project dependencies.<\/p>\n\n\n\n
\u2022 Prevent version conflicts
\u2022 Keep projects independent
\u2022 Maintain clean system Python
\u2022 Professional development practice<\/p>\n\n\n\n
Example: Open Command Prompt or Terminal:<\/p>\n\n\n\n This creates a folder named After activation, you will see the environment name in the terminal like:<\/p>\n\n\n\n Once activated:<\/p>\n\n\n\n The package will be installed only inside this environment.<\/p>\n\n\n\n To exit:<\/p>\n\n\n\n Shows packages installed in that specific environment.<\/p>\n\n\n\n To install dependencies later:<\/p>\n\n\n\n Very important for sharing projects.<\/p>\n\n\n\n Simply delete the \u2022 Most beginners use \u2022 Create one environment per project Virtual environments keep your Python projects clean, organized, and conflict-free. They are essential for professional Python development.<\/p>\n\n\n
Project A needs numpy 1.20<\/code>
Project B needs numpy 1.26<\/code>
Virtual environments allow both to work without conflict.<\/p>\n\n\n\nCREATE A VIRTUAL ENVIRONMENT<\/strong><\/h2>\n\n\n\n
python -m venv myenv<\/pre>\n\n\n\n
myenv<\/code> containing a separate Python environment.<\/p>\n\n\n\nACTIVATE VIRTUAL ENVIRONMENT<\/strong><\/h2>\n\n\n\n
Windows<\/strong><\/h3>\n\n\n\n
myenv\\Scripts\\activate<\/pre>\n\n\n\n
Mac \/ Linux<\/strong><\/h3>\n\n\n\n
source myenv\/bin\/activate<\/pre>\n\n\n\n
(myenv)<\/pre>\n\n\n\n
INSTALL PACKAGES INSIDE VIRTUAL ENVIRONMENT<\/strong><\/h2>\n\n\n\n
pip install requests<\/pre>\n\n\n\n
DEACTIVATE VIRTUAL ENVIRONMENT<\/strong><\/h2>\n\n\n\n
deactivate<\/pre>\n\n\n\n
CHECK INSTALLED PACKAGES<\/strong><\/h2>\n\n\n\n
pip list<\/pre>\n\n\n\n
SAVE PROJECT DEPENDENCIES<\/strong><\/h2>\n\n\n\n
pip freeze > requirements.txt<\/pre>\n\n\n\n
pip install -r requirements.txt<\/pre>\n\n\n\n
DELETE A VIRTUAL ENVIRONMENT<\/strong><\/h2>\n\n\n\n
myenv<\/code> folder.<\/p>\n\n\n\nCOMMON VIRTUAL ENVIRONMENT TOOLS<\/strong><\/h2>\n\n\n\n
venv<\/code> (built-in)
\u2022 virtualenv<\/code>
\u2022 conda<\/code><\/p>\n\n\n\nvenv<\/code>.<\/p>\n\n\n\nBEST PRACTICES<\/strong><\/h2>\n\n\n\n
\u2022 Do not install packages globally
\u2022 Always activate before installing packages
\u2022 Keep requirements.txt<\/code> updated<\/p>\n\n\n\nKEY TAKEAWAY<\/strong><\/h2>\n\n\n\n