correct way to check for True in __builtins__?

[Mark McEahern]

I want to check whether True is builtin and I thought I'd be clever by
saying:

	if True not in __builtins__:
		True = bool(1)
		False = bool(0)

of course, __builtins__ doesn't seem to be built to be accessed that way.

  http://mail.python.org/pipermail/pythonmac-sig/2001-April/003285.html

I could also do:

	import sys
	# examine sys.version_info tuple, if it's less than 2, 2, 1...

Or:

	if True in dir(__builtins__):
		...

Is there a preferred way to do this?

Thanks,

// mark