Pre-commit + Mypy Get Confused About Minimum Python Requirements

May 3, 2025 by ADMIN 65 views

Introduction

In this article, we will explore the issue of pre-commit and mypy getting confused about the minimum Python requirements. We will delve into the problem, analyze the code, and provide a solution to this issue.

Problem Description

The problem arises when running pre-commit on a file that imports a library with a specific version requirement. In this case, the file debug.py imports pytensor, which has a version requirement of pytensor < 2.20.0. However, mypy is configured to use a different version of pytensor, which is not compatible with the version requirement.

Code Analysis

Let's take a closer look at the code:

import pytensor

This line of code imports the pytensor library. However, the version of pytensor used by mypy is not compatible with the version requirement specified in the code.

pre-commit Configuration

The pre-commit configuration is defined in the .pre-commit-config.yaml file:

repos:
  - repo: https://github.com/pre-commit/mirrors-mypy
    rev: "v1.15.0"
    hooks:
      - id: mypy
        files: debug.py
        args: []
        additional_dependencies:
          - pytensor

In this configuration, we can see that mypy is configured to use the pytensor library as an additional dependency. However, this configuration does not specify the version requirement of pytensor.

mypy Configuration

The mypy configuration is defined in the project_version configuration:

additional_dependencies:
  - "pytensor < 2.20.0"

In this configuration, we can see that the version requirement of pytensor is specified as < 2.20.0. However, this configuration is not being used by mypy.

Solution

To solve this issue, we need to modify the pre-commit configuration to use the version requirement specified in the mypy configuration. We can do this by adding the following line to the pre-commit configuration:

additional_dependencies:
  - "pytensor < 2.20.0"

This will ensure that mypy uses the correct version of pytensor and resolves the version requirement conflict.

Conclusion

In conclusion, the issue of pre-commit and mypy getting confused about the minimum Python requirements is caused by a mismatch between the version requirements specified in the code and the mypy configuration. By modifying the pre-commit configuration to use the version requirement specified in the mypy configuration, we can resolve this issue and ensure that mypy uses the correct version of pytensor.

Troubleshooting

If you are still experiencing issues with pre-commit and mypy, you can try the following troubleshooting steps:

Check the pre-commit configuration to ensure that it is correctly configured to use the version requirement specified in the mypy configuration.
Check the mypy to ensure that it is correctly configured to use the version requirement specified in the code.
Run pre-commit with the --verbose flag to enable verbose output and see if there are any errors or warnings that may indicate the cause of the issue.

Additional Resources

For more information on pre-commit and mypy, you can refer to the following resources:

pre-commit documentation: https://pre-commit.com/
mypy documentation: https://mypy.readthedocs.io/en/latest/

FAQ

Q: What is the minimum Python requirement for mypy?

A: The minimum Python requirement for mypy is Python 3.6.

Q: How do I configure mypy to use a specific version of a library?

A: You can configure mypy to use a specific version of a library by specifying the version requirement in the mypy configuration.

Q: How do I troubleshoot issues with pre-commit and mypy?

Q&A

Q: What is the issue with pre-commit and mypy?

A: The issue with pre-commit and mypy is that they get confused about the minimum Python requirements. This can cause errors and warnings when running pre-commit and mypy on a project.

Q: What is the cause of this issue?

A: The cause of this issue is a mismatch between the version requirements specified in the code and the mypy configuration.

Q: How do I resolve this issue?

A: To resolve this issue, you need to modify the pre-commit configuration to use the version requirement specified in the mypy configuration.

Q: What is the minimum Python requirement for mypy?

A: The minimum Python requirement for mypy is Python 3.6.

Q: How do I configure mypy to use a specific version of a library?

A: You can configure mypy to use a specific version of a library by specifying the version requirement in the mypy configuration.

Q: How do I troubleshoot issues with pre-commit and mypy?

A: You can troubleshoot issues with pre-commit and mypy by checking the pre-commit configuration, the mypy configuration, and running pre-commit with the --verbose flag.

Q: What are some common issues with pre-commit and mypy?

A: Some common issues with pre-commit and mypy include:

mypy not being able to find the correct version of a library
pre-commit not being able to run mypy due to a version conflict
mypy not being able to resolve the version requirements of a library

Q: How do I configure pre-commit to use a specific version of a library?

A: You can configure pre-commit to use a specific version of a library by specifying the version requirement in the pre-commit configuration.

Q: What is the difference between pre-commit and mypy?

A: pre-commit is a tool that runs mypy and other hooks on a project before committing changes. mypy is a tool that checks the code for type errors and other issues.

Q: How do I use pre-commit and mypy together?

A: To use pre-commit and mypy together, you need to configure pre-commit to run mypy and other hooks on a project. You can do this by adding the following line to your pre-commit configuration:

repos:
  - repo: https://github.com/pre-commit/mirrors-mypy
    rev: "v1.15.0"
    hooks:
      - id: mypy
        files: debug.py
        args: []
        additional_dependencies:
          - pytensor

Q: What are some best practices for using pre-commit and mypy?

A: Some best practices for using pre-commit and mypy include:

Always use the latest version of **pre-commit and mypy
Always configure pre-commit to run mypy and other hooks on a project
Always specify the version requirements of libraries in the mypy configuration
Always troubleshoot issues with pre-commit and mypy by checking the configuration and running pre-commit with the --verbose flag.

Conclusion

In conclusion, pre-commit and mypy are two powerful tools that can help you catch errors and improve the quality of your code. However, they can also get confused about the minimum Python requirements, which can cause errors and warnings. By following the best practices outlined in this article, you can use pre-commit and mypy together to improve the quality of your code and catch errors before they become a problem.