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debug-explainer.vercel.app
Error message
TypeError: 'NoneType' object
is not subscriptable
Your code
def get_first(lista):
    return lista[0]

result = get_first(None)
print(result)
What went wrong
You're trying to access an element of a variable that is None instead of a list.
The fix
def get_first(lista):
    if lista is None:
        return None
    return lista[0]
How it works
Three steps to clarity
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1

Paste your error

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2

Add your code

Paste the code that caused the error so the AI has full context to diagnose it.

3

Understand & fix

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Features
Everything you need
Built for students and developers who want to actually understand their code.
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Plain English explanations

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Languages
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What people say
Real feedback
From the r/learnprogramming community.
"The traceback gives you the line, you know the type that was expected, then you work backwards to find where None came from. That's exactly what this explains."
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Reddit user
r/learnprogramming
"Some things just stick better when you struggle with them first. Having an AI explain WHY the error happened makes it click much faster."
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Reddit user
r/learnprogramming
"The clearest breakdown I've seen. It gives you a mental checklist: find the line, identify which variable is None, trace back where it was assigned."
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Reddit user
r/learnprogramming

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DebugBuddy - Stop googling your errors. | Product Hunt