Capitalization of each sentence in a string in Python 3

Question

This should be easy but somehow I\'m not quite getting it.

My assignment is:

Write a function sentenceCapitalizer that has one parameter of type

Answer 1

This does the job. Since it extracts all sentences including their trailing whitespace, this also works if you have multiple paragraphs, where there are line breaks between sentences.

import re

def sentence_case(text):
    # Split into sentences. Therefore, find all text that ends
    # with punctuation followed by white space or end of string.
    sentences = re.findall('[^.!?]+[.!?](?:\s|\Z)', text)

    # Capitalize the first letter of each sentence
    sentences = [x[0].upper() + x[1:] for x in sentences]

    # Combine sentences
    return ''.join(sentences)

Here is a working example.