On 02/04/2012 01:13 PM, noydb wrote:
How do you build a dictionary dynamically? Doesn't seem to be an
insert object or anything. So I need an empty dictionary that I then
want to populate with values I get from looping through a list and
grabbing some properties. So simply, I have (fyi, arcpy = module for
interacting with gis data)
inDict = {}
for inFC in inFClist:
print inFC
inCount = int(arcpy.GetCount_management(inFC).getOutput(0))
where I want to make a dictionary like {inFC: inCount, inFC:
inCount, ....}
How do I build this???
And, is dictionaries the best route go about doing a comparison, such
that in the end I will have two dictionaries, one for IN and one for
OUT, as in I'm moving data files and want to verify that the count in
each file matches between IN and OUT.
Thanks for any help!
A dictionary is a mapping from key to value. So each entry consists of
a key and a value, where the key is unique. As soon as you add another
item with the same key, it overwrites the earlier one. The only other
important constraint is that the key has to be of an immutable type,
such as int or string.
So you want to add the current inFC:inCount as an item in the
dictionary? Put the following in your loop.
inDict[inFC] = inCount
You might also want to check if the key is a duplicate, so you could
warn your user, or something. Easiest way to do that is
if inFC in inDict:
--
DaveA
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