Question

I have the following python code:

import regex
original = " the  quick ' brown 1 fox! jumps-over the 'lazy' doG? !  "
s = [i for i in original.split(" ")]

I want to write a function called get_sentence which takes an element within s and returns the sentence as a string to which the element belongs. For example:

"brown" ->  "the  quick ' brown 1 fox!"

if the first “the” is passed to the function, then:

"the" -> the  quick ' brown 1 fox!"

if the second the:

"the" -> "jumps-over the 'lazy' doG?"

What would you pass as an argument to such a function? In C++ I might pass in an std::vector::const_iterator. In C I would pass in an int (array index) or maybe even a pointer.

Answer 1

>>> from itertools import product, chain
>>> #Assuming your original sentence is
>>> origional = " the  quick ' brown 1 fox! jumps-over the 'lazy' doG? !  "
>>> #Sentence terminators are
>>> sent_term = "[?!.;]"
>>> #I will use regex to split it into sentences
>>> re.split(sent_term, origional.strip())
["the  quick ' brown 1 fox", " jumps-over the 'lazy' doG", ' ', '']
>>> #And then split it as words
>>> #I could have used str.split, but that would include punctuations
>>> #Which you may not be interested
>>> #For each of the words, I create a mapping with the sentence using product
>>> word_map = ((product(re.split("\W",e),[e])) 
                 for e in re.split(sent_term, origional.strip()))
>>> #Chain it as a single list
>>> word_map = chain(*((product(re.split("\W",e),[e])) 
                        for e in re.split(sent_term, origional.strip())))
>>> from collections import defaultdict
>>> #Create a default dict
>>> words = defaultdict(list)
>>> #And populated all non trivial words
>>> for k, v in word_map:
    if k.strip():
        words[k]+=[v]


>>> words
defaultdict(<type 'list'>, {'brown': ["the  quick ' brown 1 fox"], 'lazy': [" jumps-over the 'lazy' doG"], 'jumps': [" jumps-over the 'lazy' doG"], 'fox': ["the  quick ' brown 1 fox"], 'doG': [" jumps-over the 'lazy' doG"], '1': ["the  quick ' brown 1 fox"], 'quick': ["the  quick ' brown 1 fox"], 'the': ["the  quick ' brown 1 fox", " jumps-over the 'lazy' doG"], 'over': [" jumps-over the 'lazy' doG"]})
>>> #Now to get the first word
>>> words['the'][0]
"the  quick ' brown 1 fox"
>>> #Now to get the second sentence
>>> words['the'][1]
" jumps-over the 'lazy' doG"