Improve Python course documentation

README.md

@@ -1,6 +1,6 @@
 # Playground and Cheatsheet for Learning Python
 
-> 🇺🇦 UKRAINE [IS BEING ATTACKED](https://war.ukraine.ua/) BY RUSSIAN ARMY. CIVILIANS ARE GETTING KILLED. RESIDENTIAL AREAS ARE GETTING BOMBED.
+> 🇺🇦 UKRAINE [IS BEING ATTACKED](https://war.ukraine.ua/) BY THE RUSSIAN ARMY. CIVILIANS ARE GETTING KILLED. RESIDENTIAL AREAS ARE GETTING BOMBED.
 > - Help Ukraine via:
 >   - [Serhiy Prytula Charity Foundation](https://prytulafoundation.org/en/)
 >   - [Come Back Alive Charity Foundation](https://savelife.in.ua/en/donate-en/)
@@ -34,6 +34,7 @@ without launching them.
 Each Python script in this repository has the following structure:
 
 ```python
+
 """Lists  <--- Name of the topic here
 
 # @see: https://www.learnpython.org/en/Lists  <-- Link to further readings goes here
@@ -50,12 +51,20 @@ def test_list_type():
 
     # Here is an example of how to build a list.  <-- Comments here explain the action
     squares = [1, 4, 9, 16, 25]
+    cubes = [1, 8, 27, 64, 125]
 
-    # Lists can be indexed and sliced. 
+    # Lists can be indexed, sliced and even merged.
+
     # Indexing returns the item.
     assert squares[0] == 1  # <-- Assertions here illustrate the result.
+
     # Slicing returns a new list.
     assert squares[-3:] == [9, 16, 25]  # <-- Assertions here illustrate the result.
+
+    # Merging returns a new combined list.
+    merged = squares + cubes
+    assert merged == [1, 4, 9, 16, 25, 1, 8, 27, 64, 125]
+
 ```
 
 So normally you might want to do the following:
@@ -65,7 +74,7 @@ So normally you might want to do the following:
 - Look at code examples and assertions to see usage examples and expected output.
 - Change code or add new assertions to see how things work.
 - [Run tests](#testing-the-code) and [lint the code](#linting-the-code) to see if it work and is 
-written correctly.
+  written correctly.
 
 ## Table of Contents
 
@@ -155,7 +164,9 @@ by running `pip` or `pip3`.
 You may check your Python version by running:
 
 ```bash
+
 python --version
+
 ```
 
 Note that in this repository whenever you see `python` it will be assumed that it is Python **3**.
@@ -165,7 +176,9 @@ Note that in this repository whenever you see `python` it will be assumed that i
 Install all dependencies that are required for the project by running:
 
 ```bash
+
 pip install -r requirements.txt
+
 ```
 
 ## Testing the Code
@@ -178,13 +191,17 @@ You may add new tests for yourself by adding files and functions with `test_` pr
 To run all the tests please execute the following command from the project root folder:
 
 ```bash
+
 pytest
+
 ```
 
 To run specific tests please execute:
 
 ```bash
+
 pytest ./path/to/the/test_file.py
+
 ```
 
 ## Linting the Code
@@ -197,14 +214,18 @@ To check if the code is written with respect
 to [PEP 8](https://www.python.org/dev/peps/pep-0008/) style guide please run:
 
 ```bash
+
 pylint ./src/
+
 ```
 
 In case if linter will detect error (i.e. `missing-docstring`) you may want to read more about 
 specific error by running:
 
 ```bash
+
 pylint --help-msg=missing-docstring
+
 ```
 
 [More about PyLint](http://pylint.pycqa.org/)
@@ -215,13 +236,17 @@ To check if the code is written with respect
 to [PEP 8](https://www.python.org/dev/peps/pep-0008/) style guide please run:
 
 ```bash
+
 flake8 ./src
+
 ```
 
 Or if you want to have more detailed output you may run:
 
 ```bash
+
 flake8 ./src --statistics --show-source --count
+
 ```
 
 [More about Flake8](http://flake8.pycqa.org/en/latest/)