Forming Bigrams of words in list of sentences with Python

Question

I have a list of sentences:

text = [\'cant railway station\',\'citadel hotel\',\' police stn\']. 

I need to form bigram pairs and store the

Answer 1

I think the best and most general way to do it is the following:

n      = 2
ngrams = []

for l in L:
    for i in range(n,len(l)+1):
        ngrams.append(l[i-n:i])

or in other words:

ngrams = [ l[i-n:i] for l in L for i in range(n,len(l)+1) ]

This should work for any n and any sequence l. If there are no ngrams of length n it returns the empty list.