This generates a poem from the input of a text file called "pride.txt". It relies on TextBlob.

pride.py

from textblob import TextBlob
source = open('/path/to/file.txt')

np = TextBlob(source.read()).sentences

def sentenceLength(sent):
    return len(sent)

def filter(sent): 
    for ex in ["Chapter","Section",'\'']:
        if ex in sent:
            return False
    return True

sp = sorted(np, key=sentenceLength)

breaks = 1

for i in sp:
    if (i[0].isupper() and filter(i) and breaks < 21):
        print(i, ['\n',''][breaks % 2])
        breaks += 1