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Answer 1

+1 A:

closed = {}
# ...
closed["your_key"] = problem.getSuccessors(getStartState())

Responding to comment:

If by "take out" you mean you want (4,5) to be the key and (north, 1) to be the value, you can slice the tuple:

val = problem.getSuccessors(getStartState())
closed[val[0]] = val[1:]

If you just want to drop the (4,5), you can also slice the tuple:

closed["your_key"] = problem.getSuccessors(getStartState())[1:]

And yes, you can use a variable as a key instead of a hard-coded string.

mipadi 2010-07-16 05:48:18

"your_key" can be any variable - like indexWhat if I need to take out the first thing (4,5) from it, what are the commands I shud use then?

Shilpa 2010-07-16 05:53:52

Yes, I'll address both those points in my answer.

mipadi 2010-07-16 06:34:44

Answer 2

+2 A:

I need to put the output of above function in the dictionary "closed" - how can I do that??

It entirely depends on what you want to use as the key, and what as the value! If the key is something completely unrelated to the tuple ( (4,5) , north, 1) (I'm not sure what the north identifier is supposed to be or how it got thee -- you sure it's not the string 'north' instead?!), then @mipadi's answer is correct. If the first item (the nested tuple) is the key, the other two the value, then, after

s = problem.getSuccessors(getStartState())

you'll do:

closed[s[0]] = s[1:]

If the "tuple and direction", together, are the key, and just the cost is the value, then you'll do, instead:

closed[s[:2]] = s[2]

So, what is it that you intend to use as the key into the dictionary closed?!

Alex Martelli 2010-07-16 05:55:25

I am going to use the (4,5) as the key and other 2 as values.so I shud do "s = problem.getSuccessors(getStartState())"closed[s[0]] = s[1:]If I need to use only the key, then wat shud I do? Because later on, closed to going to have a lot of entries like ((4,5),north,1).

Shilpa 2010-07-16 06:03:34

And ya if forget to mention,,it is 'north'. NOT north string

Shilpa 2010-07-16 06:05:55

If you "need to use only the key" (and never the value), then, use a `set`, not a dict (just make it with `closedset=set()` and add entries with `closedset.add(s[0])`!). If instead what you mean is that there are many direction-cost entries for each given value of the "tuple" (like `(4, 5)`), then `import collections`, use `closed = collections.defaultdict(list)`, and `closed[s[0]].append(s[1:])`. If you could explain your needs with any clarity **at all**, helping you would be much, **much** easier (and I note you still haven't accepted my _other_ answer you praised...).

Alex Martelli 2010-07-16 06:16:16

I need to use only dictionary because I need to return "action" i.e North, south....at the end of function. after doing some iterations, my dict is going to have multiple entries such as ((4,5),north,1) , ((3,4),south,1) and I need to extract the key from the dict i.e (4,5) .what shud I use?

Shilpa 2010-07-16 06:36:44

I always appreciate your response.You are the best.

Shilpa 2010-07-16 06:37:50

@Shilpa - click the green tick for the most useful answer. You should go and do it for other questions too.

detly 2010-07-16 06:42:34

is that's the one alex is talking abt? i clicked on the tick.

Shilpa 2010-07-16 06:48:07

@Shilpa - yep, that's the one. It basically signifies that "this answered my question," which gives the answerer reputation points. It's just the system here. You should go back over your other questions and do the same (unless there really was no good answer).

detly 2010-07-16 06:51:28

ok...can u plz answer my question in the comments?I think, ALEX is busy somewhere.

Shilpa 2010-07-16 06:53:17

I need to use only dictionary because I need to return "action" i.e North, south....at the end of function. after doing some iterations, my dict is going to have multiple entries such as ((4,5),north,1) , ((3,4),south,1) and I need to extract the key from the dict i.e (4,5) .what shud I use?

Shilpa 2010-07-16 07:16:32

To loop on all a dict's keys, `for k in closed:`. To get all keys as a list, `closed.keys()`. If by "extract" you mean "remove", `del` or `.pop`. I really have no idea what you mean by "I need to extract the key" -- there are many keys, which one you need? All? Remove some specific one? Give code examples! Lots of us on SO are not English speakers, nobody manages to ask questions as incomprehensible as yours -- answering your Qs is not an exercise in Python, it's an exercise in blind guessing;-).

Alex Martelli 2010-07-16 15:37:59

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