Add __getitem__ method to Sparse2Corpus to allow direct queries (#1621)
Add __getitem__ method to Sparse2Corpus to allow direct queries (#1621)

* Add __getitem__ method to Sparse2Corpus to allow direct queries

* Fix PEP8

* Add docstring for Sparse2Corpus.__getitem__

mattilyra/gensim,RaRe-Technologies/gensim,gojomo/gensim,gojomo/gensim,markroxor/gensim,RaRe-Technologies/gensim,markroxor/gensim,markroxor/gensim,RaRe-Technologies/gensim,gojomo/gensim,mattilyra/gensim,gojomo/gensim,mattilyra/gensim,piskvorky/gensim,RaRe-Technologies/gensim,piskvorky/gensim,piskvorky/gensim