what is the most frequent error in python for a beginner? [closed]

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What do you think is the most frequent errors or pitfalls a beginner may encounter when he use python?

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Forgetting the self keyword in classes.

Either in method declaration and/or when referencing class members (specially for someone coming from .NET/Java/.. world where "equivalent" this keyword can be omitted).

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My guess would be:

SyntaxError: invalid syntax

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That could be IndentationError resulting from incorrect mix of tabs and spaces in code and/or incorrect code formatting.

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Do you mean errors or pitfalls? For the later I'd say: passing mutable objects as default values:

def foo(bar=[]):
    bar.append("foobar")
    return bar

foo()
foo() # Wait! Why am I getting ['foobar', 'foobar'] here? D'Oh ;)

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After answering twice the same question. It looks like the more surprising thing it's when the script is named like the module they want to import.