Fixing “ModuleNotFoundError” for ‘numpy.testing.utils’ in Gym-Duckietown

What will you learn?

In this detailed guide, you will learn how to effectively resolve the common error “No module named ‘numpy.testing.utils'” that arises while working with gym-duckietown. By understanding the root cause of the issue and implementing a practical solution, you will enhance your skills in managing Python dependencies.

Introduction to Problem and Solution

When engaging with gym-duckietown, an exciting reinforcement learning environment, encountering dependency issues is common due to its intricate setup. One prevalent problem is the “ModuleNotFoundError” related to numpy.testing.utils. This error usually surfaces after numpy library updates where certain submodules or functions are deprecated or relocated.

To address this issue comprehensively, we will delve into why it occurs and then proceed towards resolving it by ensuring harmony among our project’s dependencies. The solution entails checking the current numpy version, grasping dependency management principles in Python projects, and verifying that all components are correctly aligned.


# Check the current numpy version
import numpy as np

# If your numpy version exceeds gym-duckietown's requirements,
# consider downgrading numpy using pip:
!pip install numpy==1.19.5  # Example version: Replace 1.19.5 with the required one.

# Copyright PHD


The provided code snippet initially verifies your installed numpy version as a crucial step before proceeding with any necessary downgrades or upgrades. Ensuring compatibility is vital! Subsequently, if your numpy version surpasses what gym-duckietown necessitates (or specifically demands an older function like those from numpy.testing.utils), downgrading becomes imperative.

Downgrading (or occasionally upgrading) a package should be executed prudently to prevent breaking other project dependencies. It is advisable to operate within a virtual environment when making such alterations to avoid impacting global installations shared by other projects.

    1. What causes a ModuleNotFoundError?

      • A ModuleNotFoundError occurs when Python fails to locate a specified module due to it being either uninstalled in your system/environment or due to a typo in the module name.
    2. Why do I need to downgrade Numpy?

      • Downgrading Numpy ensures compatibility if gym-duckietown relies on functionalities deprecated and removed from later versions of Numpy (such as numpy.testing.utils).
    3. How do I determine which Numpy version I require?

      • Refer to gym-duckietown�s documentation or GitHub issues/requirements.txt file for recommended dependency versions specified by developers.
    4. Should I always downgrade my libraries when facing similar errors?

      • Not always; consider exploring alternative solutions like updating the affected library if feasible before resorting to downgrades that may introduce additional conflicts.
    5. Can I use virtual environments for managing different projects� dependencies?

      • Absolutely! Virtual environments enable you to manage per-project dependencies without affecting global installations, making them highly recommended for Python development.

Resolving the “No module named ‘numpy.testing.utils'” error in gym-duckietown primarily involves meticulous management of dependency versions�ensuring that the numpy library aligns with duckietown�s environment requirements. By adhering to best practices regarding virtual environments usage and dependency management, addressing such challenges becomes more streamlined, allowing developers to focus on crafting solutions rather than grappling with configuration hurdles.

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