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Discover how to resolve the `TypeError` encountered when using subprocess calls in Python 3. Learn effective methods to manage byte and string objects with ease.
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How to Overcome Type Error with subprocess Call in Python 3

If you're transitioning from Python 2.7 to Python 3, you may encounter various errors. One common issue is a TypeError arising while trying to work with subprocess calls. This guide will unpack the problem you're experiencing with a script designed to check the disk file-system space and provide clear, actionable solutions to resolve the error.

Understanding the Problem

You have a script that ran smoothly under Python 2.7 but is now throwing the following error when executed in Python 3:

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

This TypeError occurs because the communicate method from subprocess.Popen returns a bytes object in Python 3. When you attempt to manipulate this output using string methods (e.g., split("\n")), Python raises an error as it expects both objects to be of the same type.

The Solution

To resolve this issue, you'll need to ensure that you properly handle the bytes returned by the subprocess. Here are two effective approaches:

Option 1: Convert Bytes to String

You can convert the bytes object to a string before performing any string operations. Here's how you can modify your code:

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

Option 2: Use a Bytes Object for Splitting

If you prefer to keep the data as bytes, you can adjust your split() method to work with bytes:

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

Important Note

Whichever method you choose, you'll need to apply the same changes to the rest of your code where you process varfs and tmPfs. Make sure that all outputs from subprocess calls are managed in a consistent manner throughout your script.

Example of Adjusted Script

Below is a modified version of your script implementing the first option (string conversion):

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

Conclusion

With these simple adjustments, you should be able to overcome the TypeError in your script. Remember that managing data types is crucial when transitioning from Python 2 to Python 3. Always verify the type of output you're dealing with when using the subprocess module. Happy coding!