John Nagle wrote:
On 10/20/2010 9:32 PM, Phlip wrote:
Not Hyp:
def _scrunch(**dict):
result = {}
for key, value in dict.items():
if value is not None: result[key] = value
return result
That says "throw away every item in a dict if the Value is None".
Are there any tighter or smarmier ways to do that?
Yes.
class nonnulldict(dict) :
def __setitem__(self, k, v) :
if not (v is None) :
dict.__setitem__(self, k, v)
That creates a subclass of "dict" which ignores stores of None values.
So you never store the unwanted items at all.
It's going to take more work than that...
--> nnd = nonnulldict(spam='eggs', ham=None, parrot=1)
--> nnd
{'ham': None, 'parrot': 1, 'spam': 'eggs'}
--> d['more_hame'] = None
--> nnd.update(d)
--> nnd
{10000:True, 'more_hame':None, 'ham':None, 'parrot':1, 'spam':'eggs'}
Tested in both 2.5 and 3.1.
~Ethan~
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