Tuesday 2 October 2018

Identifying sentence boundary in a paragraph for only fullstops - Python


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#open a file and clean its contents tokenize and identifyits sentence boundary using .

#!/usr/bin/python
import re

with open('raw_corpus.txt') as fp:
    lines = fp.read().split("\n")   #here lines contains entire file contents

#sentence incremental variable
i=1;

#to access file contents line by line
for line in lines:

#if empty break from current iteration
    if line == "":
        break

#convert to lowercase
   # line = line.lower()

#leaning
    line = re.sub(r'\.', " .", line) #substitute . with space .
    line = re.sub(r',', " ,", line) #substitute , with space ,
    line = re.sub(r'\?', " ?", line) #substitute ? with space ?
    line = re.sub(r'!', " !", line)  #substitute ! with space !

#replace multiple spaces into single spaces
    line = re.sub(r'\s+', " ", line)

#get words in current line
    if line != "" and line != " ":
        sentences = line.split('.')
        
        for sentence in sentences:
            #print ("Iam|",sentence,"|",sep='') #debugging statement
            if sentence !="" and sentence !=" ":

                words = sentence.split(' ')

                print ("<Sentence Id='",i,"'>",sep='')  #use sep='' to suppress white space while printing

                j=1   #token counter
                for word in words:
                    if word != "" and word !=" ":
                        print (j,"\t",word)
                        j=j+1
                print (j,"\t.",word)     
                print ("</Sentence>",sep='')
                i = i + 1                 #increment i 


This script opens 'raw_coprus.txt', reads its contents line by line.

Then splits each line using '.' which is identified as a sentence boundary. Each sentence is now been split into tokens using space. These tokens are incremented for each sentence and printed along with current sentence.

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