Passlib: `ModuleNotFoundError`: No Module Named 'pkg_resources'

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Resolving ModuleNotFoundError with passlib in Flask-Security

When working with Flask-Security, a popular extension for Flask, you may encounter a ModuleNotFoundError when trying to import passlib. This error occurs due to the removal of pkg_resources from the standard library in Python 3.12. In this article, we will explore the cause of this issue and provide a solution to resolve it.

Flask-Security supports Python version 3.9 and above, as marked in the PyPI package requirements. However, Python 3.12 has removed pkg_resources from the standard library and moved it to setuptools. When creating a virtual environment and installing Flask-Security, it installs passlib as a dependency. This is where the issue arises.

The Error Message

The error message you may encounter is as follows:

.venv\Lib\site-packages\passlib\pwd.py", line 16, in <module>
    import pkg_resources
ModuleNotFoundError: No module named 'pkg_resources'

Fortunately, the solution is straightforward. You can fix this issue by installing setuptools manually using pip:

pip install setuptools

This will install setuptools in your virtual environment, which will provide the necessary pkg_resources module.

Why is setuptools not a dependency?

You may wonder why setuptools is not a dependency of passlib or Flask-Security. The reason is that setuptools is a separate package that provides additional functionality for building and distributing Python packages. While it is possible to include setuptools as a dependency, it is not a requirement for passlib to function correctly.

Reporting the Issue

The issue with passlib has been reported on the passlib repository a year ago, but the last commit was 4 years ago. It is unclear whether this issue will be addressed in the future.

In conclusion, the ModuleNotFoundError with passlib in Flask-Security is a known issue that can be resolved by installing setuptools manually. While it may seem like a minor issue, it can cause frustration for developers who are trying to get started with Flask-Security. We hope that this article has provided a helpful solution to this problem.

  • Make sure you are using the correct Python version (3.9 or above) and virtual environment.
  • Check that you have installed setuptools correctly using pip.
  • If you are still experiencing issues, try reinstalling passlib and setuptools using pip.

It is unclear whether the passlib team will address this issue in the future. However, by installing setuptools manually, you can resolve this issue and continue working with Flask-Security.
Q&A: Resolving ModuleNotFoundError with passlib in Flask-Security

In our previous article, we explored the issue of ModuleNotFoundError with passlib in Flask-Security. We discussed the cause of the issue, the error message, and the solution to resolve it. In this article, we will provide a Q&A section to address some common questions and concerns related to this issue.

Q: What is the cause of the ModuleNotFoundError with passlib in Flask-Security?

A: The cause of the ModuleNotFoundError with passlib in Flask-Security is due to the removal of pkg_resources from the standard library in Python 3.12. pkg_resources is a module that is used by passlib to provide additional functionality. When pkg_resources is removed from the standard library, passlib is unable to import it, resulting in a ModuleNotFoundError.

Q: Why is setuptools not a dependency of passlib or Flask-Security?

A: setuptools is a separate package that provides additional functionality for building and distributing Python packages. While it is possible to include setuptools as a dependency, it is not a requirement for passlib to function correctly. However, by installing setuptools manually, you can resolve the ModuleNotFoundError with passlib in Flask-Security.

Q: How do I install setuptools manually?

A: To install setuptools manually, you can use pip:

pip install setuptools

This will install setuptools in your virtual environment, which will provide the necessary pkg_resources module.

Q: Why do I need to install setuptools manually? Can't it be included as a dependency?

A: While it is possible to include setuptools as a dependency, it is not a requirement for passlib to function correctly. However, by installing setuptools manually, you can resolve the ModuleNotFoundError with passlib in Flask-Security.

Q: Is this issue specific to Flask-Security or can it affect other packages as well?

A: This issue is specific to passlib and can affect other packages that use pkg_resources. However, by installing setuptools manually, you can resolve the ModuleNotFoundError with passlib in Flask-Security.

Q: What if I am using an older version of Python, such as Python 3.8 or below?

A: If you are using an older version of Python, such as Python 3.8 or below, you should not encounter this issue. However, if you are using a virtual environment, you may still need to install setuptools manually to resolve any potential issues.

Q: Can I report this issue to the passlib team?

A: Yes, you can report this issue to the passlib team. However, please note that the last commit on the passlib repository was 4 years ago, and it is unclear whether this issue will be addressed in the future.

In conclusion, the ModuleNotFoundError with passlib in Flask-Security is a known issue that can be resolved by installing setuptools manually. We hope that this Q&A article has provided helpful answers to some common questions and concerns related to this issue.

  • Make sure you are using the correct Python version (3.9 or above) and virtual environment.
  • Check that you have installed setuptools correctly using pip.
  • If you are still experiencing issues, try reinstalling passlib and setuptools using pip.