Using virtual environments in python projects

Skill - Using virtual environments in python projects

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Skills Required

• Setup python development environment
• Install and manage python packages
• Virtual environments using ‘venv’

Please make sure to have all the skills mentioned above to understand and execute the code mentioned below. Go through the above skills if necessary for reference or revision

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Demo Project with virtual environment

A sample python demo project with virtual environment is hosted at https://github.com/nagasudhirpulla/sample_python_script_template

You can download the project files here

Scenario - Create a virtual environment from existing requirements.txt

Run / Double click the following batch files in the below sequence

• create_env.bat
• install_env.bat

Scenario - Update the current virtual environment packages in requirements.txt

Run / Double click the following batch file

• freeze_env.bat

Scenario - Run the python project with the created virtual environment

Run / Double click the following batch file

• run.bat

Each batch file explained

• create_env.bat - creates a new virtual environment
• install_env.bat - installs packages from requirements.txt in the virtual environment
• activate_env.bat - activates the created virtual environment
• freeze_env.bat - writes all the virtual environment packages into requirements.txt file

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Further Reading

• https://packaging.python.org/guides/installing-using-pip-and-virtual-environments/#creating-a-virtual-environment

Video

You can the video on this post here

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