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Deep Learning Fundamentals

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Deep Learning Fundamentals

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Deep Learning Fundamentals > Unit 2 > Unit 2.5

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2.5 Debugging Code

References

pdb — The Python Debugger

What we covered in this video lecture

In this lecture, we saw how we could use pdb as an alternative to print statements for debugging code. Using a debugger to find and fix errors in your code is not a requirement. However, it can make your life easier. There is definitely a learning curve to it, and it takes time to become comfortable with using it.

Additional resources if you want to learn more

While pdb is the most fundamental debugger, many people prefer visual debuggers. Check out the resources below if you want to learn more:

Visual debugging in PyCharm William Falcon and Sebastian Raschka
Visual debugger in Visual Studio Code
Visual debugging in Jupyter Lab

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Quiz: 2.5 Debugging Code

Suppose we have the following code, c = a + b, which raises a TypeError.

To find the cause for the TypeError, we want to inspect the values of a and b using the pdb debugger. If we want to drop into the interactive debugger to evaluate the values a and b, we place the line import pdb; pdb.set_trace() before or after c = a + b?

Before

Correct. We need to insert the set_trace() command before the error occurs.

After

Incorrect. We need to insert the set_trace() command after the error occurs.

Suppose we have the following code, c = a + b, which raises a TypeError.

What are good options for evaluating the values of a and b to find out why the TypeError is raised?

Place the line import pdb; pdb.set_trace() before c = a + b.

Correct. We need to insert the set_trace() command before the error occurs.

Place the line import pdb; pdb.set_trace() after c = a + b.

Incorrect. We need to insert the set_trace() command after the error occurs.

Place the line import pdb; pdb.post_mortem() before c = a + b.

Incorrect. Post-mortem is used to inspect code after the error occurs.

Place the line import pdb; pdb.post_mortem() after c = a + b.

Incorrect. Post-mortem is used to inspect code after the error occurs, but it also requires the try-except.

In a try-except block, place the line import pdb; pdb.post_mortem() under try and c = a + b under except.

Incorrect. The post_mortem mode should be entered when an exception is raised, not the other way around.

In a try-except block, place the line c = a + b under try and import pdb; pdb.post_mortem() under except.

Correct. The post_mortem mode should be entered when an exception is raised.

Please answer all questions to proceed.

Watch Video 1 Mark complete and go to Unit 2.6 →

Unit 2.5

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