Martin Panter added the comment:
Marco: I agree “Python reports an error” would have been simpler. That is what
I meant to say. Anyway, perhaps we should put
Python raises :exc:`IndentationError` if mixed tabs and spaces are causing
problems in leading whitespace.
In general, the exception seems to be IndentationError. TabError is a subclass,
but is not raised in all circumstances. It seems the compiler assumes a
particular tab model, so the exact exception depends on the amount of tabs and
spaces:
>>> exec("if True:\n" + " "*8 + "1\n" "\t2\n")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<string>", line 3
2
^
TabError: inconsistent use of tabs and spaces in indentation
>>> exec("if True:\n" + " "*9 + "1\n" "\t2\n")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<string>", line 3
2
^
IndentationError: unindent does not match any outer indentation level
----------
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<http://bugs.python.org/issue29387>
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