No module named pkg_resources

Demystifying pkg_resources

Let's get down to understanding pkg_resources. Part of setuptools, it supercharges Python distutils enabling us to build and distribute Python packages, especially those having dependencies on others.

Setuptools can be a tease

Sometimes, your package manager might feign ignorance and exclude pkg_resources even after setuptools is installed. Usually, it's all about broken or outdated links. Here's how you handle those scenarios:

• Keep an eye out for broken virtualenv paths. They are often the culprits for this error.
• Go back to basics. Reinstall python-setuptools using your OS's package manager:

  sudo apt-get install --reinstall python-setuptools
  

• If you're coming from the distribute camp, say your goodbye. Uninstall it before switching to setuptools.

Juggling with Setuptools versions

If you have multiple performers like many versions of setuptools or compatible packages like distribute, it gets messy. Ensure a smooth act by:

• Bidding adieu to versions of setuptools below 0.6. They trouble the stability—talk about version conflicts.
• Clear the stage. Uninstall distribute, as setuptools now carry all its tricks.
• Give a forceful command. Use pip install --force-reinstall to upgrade both setuptools and pip in a virtual environment.

Compatibility is the new cool

Always check for environment compatibility. Older systems like Ubuntu 16.04 can sometimes be tough. Also, watch out for specific library versions. They like behaving differently, causing annoying compatibility issues.

Virtual environments deserve special attention

When working with virtual environments, you might want to consider a few extra tips:

• The golden rule is: Running pip install setuptools within a virtualenv often fixes the problem.
• If you're tired of hitting walls, start from scratch. Create a new virtualenv and re-install your packages.
• Get aware of virtualenvwrapper. Think of it as the assistant you never knew you needed—an extension to virtualenv that provides additional commands, making your life easier.

Be the Sherlock for complex issues

When the going gets tough, and none of the solutions work, clamp on your detective cap. Diagnose with these steps:

• Test after updating: You don't want to hand out surprises to your production server, do you? Test updates in a development environment before the big move.
• Call for community: Stuck? Ask the wise ones. Places like Stack Overflow or Python forums can provide critical insights.
• Evaluate: Look beyond setuptools. Maybe, there's another library or package that's causing chaos.
• Colleague consults: Interact with your buds at work. They might have found another way around the problem if they faced it before.