On 16/01/14 19:43, Larry Hastings wrote:
On 01/16/2014 04:21 AM, MRAB wrote:
On 2014-01-16 05:32, Larry Hastings wrote:
[snip]
We could add a special value, let's call it
sys.NULL, whose specific semantics are "turns into NULL when passed into
builtins". This would solve the problem but it's really, really awful.
Would it be better if it were called "__null__"?
No. The problem is not the name, the problem is in the semantics. This
would mean a permanent special case in Python's argument parsing (and
"special cases aren't special enough to break the rules"), and would
inflict these same awful semantics on alternate implementations like
PyPy, Jython, and IronPython.
Indeed.
Why not just change the clinic spec a bit, from
'The "default" is a Python literal value.' to
'The "default" is a Python literal value or NULL.'?
A NULL default would imply the parameter is optional
with no default.
Cheers,
Mark.
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