Is IndentationError a syntax error in Python or not?

Question

I have a simple question,

Is IndentationError a SyntaxError in Python or not?

I think it is not but since I am a beginner I would like to be sure. Are syntax errors only those which give me SyntaxError as a response in an interpreter? For example, if I type

3f = 22 

I get

SyntaxError: invalid syntax 

So if there's something else (IndentationError etc), may it be a sub-type of SyntaxError or not?

Answer 1

>>> issubclass(IndentationError, SyntaxError)
True

It means yes

More info here and here

Answer 2

Your example is a SyntaxError, because you can't have an identifier that starts with a number:

>>> 3f = 22
  File "<stdin>", line 1
    3f = 22
     ^
SyntaxError: invalid syntax


>>>     f3 = 22
  File "<stdin>", line 1
    f3 = 22
    ^
IndentationError: unexpected indent


>>> def test():
... f3 = 22
  File "<stdin>", line 2
    f3 = 22
     ^
IndentationError: expected an indented block

An IndentationError is a kind of SyntaxError, see the method resolution order in: help(IndentationError) and: http://docs.python.org/2/library/exceptions.html#exceptions.IndentationError

Valid identifiers:

test
test3
test_3
__3Test_3______

Invalid identifiers:

3f
333
33__
# Using any symbol other than: _

See also:

http://docs.python.org/2/reference/lexical_analysis.html#identifiers