Python – Start and End Indices of words from list in String

Given a String, our task is to write a Python program to extract the start and end index of all the elements of words of another list from a string.

Input : test_str = “gfg is best for all CS geeks and engineering job seekers”, check_list = [“geeks”, “engineering”, “best”, “gfg”]

Output : {‘geeks’: [23, 27], ‘engineering’: [33, 43], ‘best’: [7, 10], ‘gfg’: [0, 2]}

Explanation : “geeks” starts from index number 23 till 27, hence the result.

Input : test_str = “gfg is best for all CS geeks and engineering job seekers”, check_list = [“geeks”, “gfg”]

Output : {‘geeks’: [23, 27], ‘gfg’: [0, 2]}

Explanation : “geeks” starts from index number 23 till 27, hence the result.

Method #1 : Using loop + index() + len()

In this, loop is used to get each element from list. The index() gets the initial index and len() gets the last index of all the elements from list in the string.

Output:

The original string is : gfg is best for all CS geeks and engineering job seekers

Required extracted indices  : {‘geeks’: [23, 27], ‘engineering’: [33, 43], ‘best’: [7, 10], ‘gfg’: [0, 2]}

Method #2 : Using dictionary comprehension + len() + index()

In this, we perform tasks similar to the above function but the construction of the result dictionary is done using shorthand using dictionary comprehension. 

Output:

The original string is : gfg is best for all CS geeks and engineering job seekers

Required extracted indices  : {‘geeks’: [23, 27], ‘engineering’: [33, 43], ‘best’: [7, 10], ‘gfg’: [0, 2]}