Question: I have a WordNet synset offset (for example `id="n#05576222"`). Given this offset, how can I get the synset using Python?

Answer: 
As of NLTK 3.2.3, there's a public method for doing this:

```
wordnet.synset_from_pos_and_offset(pos, offset)

```

In earlier versions you can use:

```
wordnet._synset_from_pos_and_offset(pos, offset)

```

This returns a synset based on it's POS and offest ID. I think this method is only available in NLTK 3.0 but I'm not sure.

Example:

```
from nltk.corpus import wordnet as wn
wn.synset_from_pos_and_offset('n',4543158)
>> Synset('wagon.n.01')

```
You can use [`of2ss()`](http://www.nltk.org/_modules/nltk/corpus/reader/wordnet.html), For example:

```
from nltk.corpus import wordnet as wn
syn = wn.of2ss('01580050a')

```

will return 
`Synset('necessary.a.01')`