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Скачать или смотреть Fixing the ValueError: Unsupported 'device_type' Error in Python Networking Scripts

  • vlogize
  • 2025-10-06
  • 1
Fixing the ValueError: Unsupported 'device_type' Error in Python Networking Scripts
ValueError: Unsupported 'device_type'python 3.xnetmiko
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Описание к видео Fixing the ValueError: Unsupported 'device_type' Error in Python Networking Scripts

Learn how to resolve the `ValueError: Unsupported 'device_type'` when using Netmiko in Python. This guide provides clear solutions and best practices for your networking scripts.
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This video is based on the question https://stackoverflow.com/q/63978218/ asked by the user 'Eli Kazum' ( https://stackoverflow.com/u/14309265/ ) and on the answer https://stackoverflow.com/a/63978369/ provided by the user 'Mithilesh_Kunal' ( https://stackoverflow.com/u/4082012/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: ValueError: Unsupported 'device_type'

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The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
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Fixing the ValueError: Unsupported 'device_type' Error in Python Networking Scripts

As a beginner in Python, running into errors can be frustrating, especially when dealing with networking libraries like Netmiko. One common issue that newcomers face is the ValueError: Unsupported 'device_type'. If you've encountered this error while attempting to connect to a Cisco device, you're not alone. Let's explore what this error means and how you can resolve it effectively.

Understanding the Error

When you utilize the Netmiko library for networking tasks, it requires you to specify the type of device you're connecting to. In an example provided, the code attempts to connect to a Cisco device using the following snippet:

[[See Video to Reveal this Text or Code Snippet]]

Upon executing this code, you may encounter an error message similar to the one below:

[[See Video to Reveal this Text or Code Snippet]]

The message explicitly indicates that the specified device_type is not recognized by the library. In this case, device_type='Cisco_ios' should be using the correct casing.

Solution: Correct the Device Type

Step 1: Change the Device Type String

The error occurs because the device type string is case-sensitive. To fix this issue, you must use the lowercase form of the device type. In our case, change Cisco_ios to cisco_ios. Here’s how the corrected code looks:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Re-run Your Script

After making this adjustment, save your script and run it again. You should find that the error has been resolved, allowing you to successfully connect to the Cisco device and execute commands such as retrieving the interface status.

Recap and Best Practices

Understand Case Sensitivity: Ensure that all strings passed to libraries, especially for critical parameters like device_type, strictly adhere to the required casing.

Refer to Documentation: Familiarizing yourself with the documentation of the libraries you use can help prevent such errors.

Handle Errors Gracefully: Using try-except blocks in your scripts can help manage errors when they occur, making debugging easier for new programmers.

Conclusion

By paying attention to the details, such as case sensitivity, you can avoid the ValueError: Unsupported 'device_type' error in your Python scripts when working with Netmiko. Don't let small mistakes deter you from exploring the powerful capabilities of Python in networking. Keep experimenting, learning, and growing your skills!

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