Robert Rawlins - Think Blue wrote: > I have two dicts, one named 'this' and the other named 'that'. > > I want to get all the unique keys from 'this' and log them into a file, I > then want to take all the unique values from 'that' and log them into a > separate file.
Couple of points which are confusing me: 1) Any dict can *only* have unique keys, ie you can't have a key appearing more than once in a dictionary by definition. 2) You speak of unique keys in "this" but unique values in "that". Is that deliberate on your part? Might be, but I'm not quite clear. > I have functions set up for the logging, so I can call it like > logThis(uniquekey) and logThat(uniquekey). Here you refer to "uniquekey" in both cases, so maybe a mistake above? > So it's just a case of firstly returning a list of all keys that are in > 'this' but NOT in 'that' and then visa versa, then loop over them performing > the function. OK, well following by example earlier: <code> d1 = dict (a=1, b=2, c=3) d2 = dict (b=4, c=5, d=6) s1 = set (d1) # => set of 'a', 'b', 'c' s2 = set (d2) # => set of 'b', 'c', 'd' s1_not_in_s2 = s1 - s2 # => set of 'a' s2_not_in_s1 = s2 - s1 # => set of 'd' for key in s1_not_in_s2: print key, "=>", d1[key] for key in s2_not_in_s1: print key, "=>", d2[key] </code> Obviously there are more concise ways of representing this; I'm just spelling the whole thing out to make it clearer (I hope). If this approach seems fruitful, have a look at the set typeit's a recentish addition to Python but very useful for this kind of thing: http://docs.python.org/lib/types-set.html TJG -- http://mail.python.org/mailman/listinfo/python-list
