[Zope3-checkins] CVS: Zope3/src/zope/schema -_bootstrapfields.py:1.21

[Fred L. Drake, Jr.]

Garrett Smith writes:
 > Fields define missing_value as class attributes and I don't want to
 > overwrite those values unless missing_value is specified in the
 > initializer. I'm not using None because that's a valid missing value.

Ah, you expect other classes to define missing_value; that makes
sense.  I'll add a comment about that.  I think it also makes sense
for the marker to be a public global rather than a class attribute.
That would avoid the pathological case where some adds their own value
for self._missing_value_marker in a subclass.


  -Fred

-- 
Fred L. Drake, Jr.  <fred at zope.com>
PythonLabs at Zope Corporation