Learn to design, develop, and execute basic programs in Python.

Zero to Hero in Python for Data Science

This module provides a comprehensive introduction to the tools that help create various programs, such as documents, movies, and games. We'll start with a brief introduction to data science, followed by simple math, real-world problem solving, and precise writing solutions. Next, we'll learn decision-based solutions demonstrated via flowcharts and explained with execution sheets. Finally, we'll learn to translate our solutions into Python programs using variables, conditional statements, loops, strings, lists, and built-in functions. We'll also learn to create our custom functions in Python. After completing this module, we will have acquired the skills to write basic programs in Python.

Understanding Data Science with a focus on Python

# Task
This task requires you to find the index of the first outlier in a given list. All numbers in a list are in an arithmetic sequence, except one number. 


Write a program that uses a list and finds the index of the first outlier and stores it to the variable `idx`. The list is guaranteed to have at least $5$ elements and the first two elements will be in the required arithmetic sequence. The value of the `idx` should be $−1$ if the array has no outlier, and should be $0$ if the array length is less than $5$.

 
---

## Sample input 1
```t
list1 = [5,8,11,13,17]
```
## The resulting value 1
```t
idx = 3
```
## Expected output 1
```t
The outlier value is at the index: 3
```
---
## Sample input 2
```t
list1 = [1,6,11,16,20]
```
## The resulting value 2
```t
idx = 4
```
## Expected output 2
```t
The outlier value is at the index: 4
```
---
## Sample input 3
```t
list1 = [1,6,11]
```
## The resulting value 3
```t
idx = 0
```
## Expected output 3
```t
The list has less than five elements.
```
---
## Sample input 4
```t
list1 = [2,4,6,8,10]
```
## The resulting value 4
```t
idx = -1
```
## Expected output 4
```t
There is no outlier in the list.
```
---
## How to test your program

When you click the "Test" button of the code widget, you get two options as explained below:

* **Show Results**: It shows the sample inputs and their respective results in comparison with the expected output. The actual output is the outlier index calculated to display the results. The word "Succeeded" in the last column indicates that the calculated output matches the expected output. For example, if `list1` is `[5,8,11,13,17]` and the `idx` is `3`, then the last column shows "Succeeded". Similarly, if `list1` is `[2,4,6,8,10]` and the `idx` is `-1`, then the last column shows "Succeeded".

* **Show Console**: It shows the output from the `print()` statements used in your code. You may use this to verify your calculations on the basis of sample test inputs. For example, if `list1` is `[5,8,11,13,17]`, then the output on the console should be `The outlier value is at the index: 3.`. Similarly, if `list1` is `[2,4,6,8,10]`, then the output on the console should be `There is no outlier in the list.`.

Find the index of an outlier in an arithmetic sequence.

Challenge: Arithmetic Sequence

Task