Question

I have following string:

>>>sentence='No, I shouldn't be glad, YOU should be glad.'

And what I want is to make a dictionary with a word of the sentence as key, and the next word as value.

>>>dict(sentence)
{('No,'): ['I'], ('I'): ['shouldn't'], ('shouldn't'): ['be'], ('be'): ['glad,', 'glad.'], ('glad,'): ['YOU'], ('YOU'): ['should'], ('should'): ['be']} 
                                                                 ^        ^       ^             
                                                                 |        |       |

As you can see if a word occurs multiples times in a sentence, it gets multiple values. If it’s the last word it will not be added to the dictionary. ‘glad’ doesn’t get multiple values because the word ends with a ‘,’ or ‘.’ which makes it a different string.

Answer 1

import collections

sentence = "No, I shouldn't be glad, YOU should be glad."

d = collections.defaultdict(list)
words = sentence.split()
for k, v in zip(words[:-1], words[1:]):
   d[k].append(v)
print(d)

This produces

defaultdict(<type 'list'>, {'No,': ['I'], 'be': ['glad,', 'glad.'], 'glad,': ['YOU'], 'I': ["shouldn't"], 'should': ['be'], "shouldn't": ['be'], 'YOU': ['should']})