Fix the “no module named” error in Python

This post will show you how to fix the “ModuleNotFoundError: No module” error. This example will focus on no module named setuptools_rust on Python error. We will also look at a cryptography module error that sometimes also occurs.

You may also be interested in: How to Setup Docker on Ubuntu.

When does the error occur?

This error occurs when you install a Python module, and a dependent module is not installed. For example, the Python 3 modules mentioned below must be the setuptools-rust plugin.

Install the Python Docker module:

pip3 install docker-compose

Install the Docker Compose module:

pip3 install docker-compose

Let’s discuss the components

What is Python?

Python is a high-level, object-oriented programming language. Consequently, it has a simple, easy-to-learn syntax that emphasizes readability. Additionally, Python supports modules and packages, encouraging program modularity. Also, code reuse is via a pip package manager.

What is setuptools-rust?

According to Python Package Index (PyPI), setuptools-rust is a plugin for setuptools. It also mentions that Setup Tools uses it to build Rust Python extensions. As such, many packages use setuptools-rust. For example, the cryptography-obf package depends on setuptools-rust. As well as hermes-python, prefetch2es, vtext, rscase, pamagent, bc4py-extension, django-doclib, and many more.

You can experience a related error that setuptools_rust indirectly. For example, you can get an “error code 1 in /tmp/pip-build-y7ibkmns/cryptography/” error. If so, then this may be related to the “no module named setuptools_rust” error. This error makes sense since the cryptography module depends on setuptools-rust.

For example, you can see below how these relate:

...
        from setuptools_rust import RustExtension
    ModuleNotFoundError: No module named 'setuptools_rust'
...

Let’s fix the setuptools_rust Python error!

You can fix the “setuptools_rust” error in Python by installing “setuptools_rust”:

pip3 install – upgrade – force-reinstall – no-cache-dir setuptools_rust

Additionally, you may want to do the same for the cryptography module:

pip3 install – upgrade – force-reinstall – no-cache-dir cryptography

Finally, you may also want to watch the following video for more advice:

Frequently asked questions about the setuptools_rust python error

How to import a module given the full path?

You can use the importlib module to import a module using a full path. See an example from: https://stackoverflow.com/.

Do you have an ImportError and ModuleNotFoundErrors in your Docker image?

This can happen if you have multiple Python interpreters in your Docker image. For example: /usr/local/bin/python and /usr/bin/python3. Therefore, you need to make sure that you install the right module for the right interpreter.

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