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196: DefaultFrom.__call__() now returns values from callback even if not basestring; small work on DefaultFrom docstrings

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This commit is contained in:
Jason Gerard DeRose 2008-08-26 16:52:46 +00:00
parent 87fabaa717
commit 0755c218ff
1 changed files with 8 additions and 5 deletions
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13
ipalib/public.py
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@ -44,7 +44,8 @@ class DefaultFrom(plugable.ReadOnly):
"""
Derives a default for one value using other supplied values.
Here is an example:
Here is an example that constructs a user's initials from his first
and last name:
>>> df = DefaultFrom(lambda f, l: f[0] + l[0], 'first', 'last')
>>> df(first='John', last='Doe') # Both keys
@ -68,16 +69,18 @@ class DefaultFrom(plugable.ReadOnly):
lock(self)
def __call__(self, **kw):
"""
If all keys are present, calls the callback; otherwise returns None.
:param kw: The keyword arguments.
"""
vals = tuple(kw.get(k, None) for k in self.keys)
if None in vals:
return None
try:
ret = self.callback(*vals)
return self.callback(*vals)
except Exception:
return None
if isinstance(ret, basestring):
return ret
return None
class Option(plugable.Plugin):