# 1. Introduction

Recursion is a powerful concept in programming where a function calls itself to solve a problem. In Python, we can use recursion to perform many operations on lists, including finding the length of the list.

## Definition

The length of a list refers to the number of items it contains. To find this recursively, the process involves counting the first element and then recursively counting the rest of the list.

# 2. Program Steps

1. Define a function that uses recursion to count the length of the list.

2. If the list is empty, return 0.

3. Otherwise, return 1 plus the length of the list minus the first element.

4. Print the result from the recursive function.

# 3. Code Program

``````# Step 1: Define the recursive function
def recursive_length(lst):
# Step 2: Check if the list is empty
if not lst:
return 0
# Step 3: Count the first element and recursively call the function for the remaining list
else:
return 1 + recursive_length(lst[1:])

# Step 4: Call the function with a list and print the result
my_list = [1, 2, 3, 4, 5]
length_of_list = recursive_length(my_list)
print(f"The length of the list is: {length_of_list}")
``````

### Output:

```The length of the list is: 5
```

### Explanation:

1. recursive_length is a function that calculates the length of lst by recursion.

2. The function checks if lst is empty; if so, it returns 0, as an empty list has a length of 0.

3. If the list is not empty, the function counts one for the first element and adds it to the result of recursive_length(lst[1:]), which is a recursive call with the rest of the list.

4. my_list is defined with five elements.

5. length_of_list holds the result of the recursive_length function call, which is the length of my_list.

6. The print statement displays length_of_list, which is 5, confirming that my_list contains five elements.