Convenience API illegal identifiers should raise SyntaxError - maybe

[Barry Warsaw]

Class syntax with invalid identifiers raises a SyntaxError:

class X(Enum):
   a-1 = 3

but the convenience API raises a ValueError. This latter should also raise SyntaxError for consistency.

OTOH, should we be consistent with namedtuples?

http://docs.python.org/3/library/collections.html?highlight=namedtuple#collections.namedtuple

>>> namedtuple('X', ('x-1', 'y-2'))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/tmp/py33/lib/python3.3/collections/__init__.py", line 334, in namedtuple
    'identifiers: %r' % name)
ValueError: Type names and field names must be valid identifiers: 'x-1'

[Barry Warsaw (barry)]

After further consideration, it makes sense to be consistent with namedtuples, so ValueError it will be for now.