Question

A sentence can end with full-stop, question mark, or an exclamation mark. Spaces precede and follow a word.

Write a Python program to perform the following tasks:

• Receive a filename from the user, open a text file for reading, and read the file.
• Count the sentences in the text file.
• Count the number of words in the text file.
• Print these two values with appropriate labels as a result of running the program

Answer 1

Code:

#ask the user to enter a filename
filename = input("Enter a filename: ")
#open the file name for reading
with open(filename, "r") as file:
#initialize variables
sentences = 0
words = 0
#iterate each line in the file object
for line in file:
sentences += line.count(".") #count the period symbols in line and add it to sentences
sentences += line.count("!") #count the exclamation symbols in line and add it to sentences
sentences += line.count("?") #count the question mark symbols in line and add it to sentences
words += len(line.split(" ")) #split the line with respect to spaces and add the lenght of the resulting list to words
print("Sentences = {}".format(sentences)) #print count of sentences
print("Words = {}".format(words)) #print count of words

Code in the image:

Output:

Contents of sample file: sun.txt

This is sentence one. This is sentence two.
How are you? Great!
Haha! I am fine.