Question

Python 3

Modify the sentence-generator program of Case Study so that it inputs its vocabulary from a set of text files at startup. The filenames are nouns.txt, verbs. txt, articles.txt, and prepositions.txt.

(HINT: Define a single new function, getWords. This function should expect a filename as an argument. The function should open an input file with this name, define a temporary list, read words from the file, and add them to the list. The function should then convert the list to a tuple and return this tuple. Call the function with an actual filename to initialize each of the four variables for the vocabulary.)

Case Study: Generating Sentences code:

import random
articles = ("A", "THE")
nouns = ("BOY", "GIRL", "BAT", "BALL")
verbs = ("HIT", "SAW", "LIKED")
prepositions = ("WITH", "BY")

def sentence():
return nounPhrase() + " " + verbPhrase()
def nounPhrase():
return random.choice(articles) + " " + random.choice(nouns)
def verbPhrase():
return random.choice(verbs) + " " + nounPhrase() + " " + \
prepositionalPhrase()
def prepositionalPhrase():
return random.choice(prepositions) + " " + nounPhrase()
def main():
number = int(input("Enter the number of sentences: "))
for count in range(number):
print(sentence())
if __name__ == "__main__":
main()

Answer 1

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Before running the program you need to have these files created like below in your unix box.

Unix Terminal> cat nouns.txt

BOY

GIRL

BAT

BALL

Unix Terminal> cat articles.txt

A

THE

Unix Terminal> cat verbs.txt

HIT

SAW

LIKED

Unix Terminal> cat prepositions.txt

WITH

BY

Unix Terminal>

Code:

#!/usr/local/bin/python3

import random

def getWords(filename):

fp = open(filename)

temp_list = list()

for each_line in fp:

each_line = each_line.strip()

temp_list.append(each_line)

words = tuple(temp_list)

fp.close()

return words

articles = getWords('articles.txt')

nouns = getWords('nouns.txt')

verbs = getWords('verbs.txt')

prepositions = getWords('prepositions.txt')

def sentence():

return nounPhrase() + " " + verbPhrase()

def nounPhrase():

return random.choice(articles) + " " + random.choice(nouns)

def verbPhrase():

return random.choice(verbs) + " " + nounPhrase() + " " + prepositionalPhrase()

def prepositionalPhrase():

return random.choice(prepositions) + " " + nounPhrase()

def main():

number = int(input('Enter number of sentences: '))

for count in range(number):

print(sentence())

if __name__=='__main__':

main()

Code screenshot:

Code output screenshot: