Introduction:

• In Python, the len() function returns the number of elements in an iterable (like a list, tuple, or string). When used with range(), it generates a sequence of numbers from 0 to the length of the iterable minus one. This sequence can then be used as indices to access elements in the iterable.

How It Works:

1. Using len() Function:
   • The len() function returns the number of elements in an iterable.
2. Print Characters of a String:

   • Write a program to print each character of a string using range(len()).

     python

     my_string = "hello"
     for i in range(len(my_string)):
         print(my_string[i])
     

3. Sum Elements of a List:

   • Write a program to sum the elements of a list using range(len()).

     python

     numbers = [10, 20, 30, 40]
     total = 0
     for i in range(len(numbers)):
         total += numbers[i]
     print(total)  # Output: 100
     

Summary:

• In this tutorial, we learned what range(len()) means in Python and how to use it to iterate over the indices of a given iterable. This is a useful technique for accessing elements in an iterable by their index. Practice these examples to get comfortable with range(len()) in your Python programs!