Count words in a sentence in Python program

In this article, we will learn about the solution to the problem statement given below.

Problem statement ? We are given a string we need to count the number of words in the string

Approach 1 ? Using split() function

The split() function breaks the string into a list iterable with space as a delimiter. if the split() function is used without specifying the delimiter space is allocated as a default delimiter.

Example

 Live Demo

test_string = "Tutorials point is a learning platform"
#original string
print ("The original string is : " + test_string)
# using split() function
res = len(test_string.split())
# total no of words
print ("The number of words in string are : " + str(res))

Output

The original string is : Tutorials point is a learning platform
The number of words in string are : 6

Approach 2 ? Using regex module

Here findall() function is used to count the number of words in the sentence available in a regex module.

Example

 Live Demo

import re
test_string = "Tutorials point is a learning platform"
# original string
print ("The original string is : " + test_string)
# using regex (findall()) function
res = len(re.findall(r'\w+', test_string))
# total no of words
print ("The number of words in string are : " + str(res))

Output

The original string is: Tutorials point is a learning platform The number of words in string is: 6

Approach 3 ? Using sum()+ strip()+ split() function

Here, we first check all the words in the given sentence and add them using the sum() function.

Example

 Live Demo

import string
test_string = "Tutorials point is a learning platform"
# printing original string
print ("The original string is: " + test_string)
# using sum() + strip() + split() function
res = sum([i.strip(string.punctuation).isalpha() for i in
test_string.split()])
# no of words
print ("The number of words in string are : " + str(res))

Output

The original string is : Tutorials point is a learning platform
The number of words in string are : 6

All the variables are declared in the local scope (Also Read: Local and Global Variables) and their references are seen in the figure above.

Conclusion

In this article, we have learned how to count the number of words in the sentence.