Final QA updates (#290)

Co-authored-by: Martin Breuss <[email protected]>

Author: gahjelle

how-to-check-if-a-python-string-contains-a-substring/README.md

@@ -6,4 +6,4 @@ In this tutorial you'll focus on the most pythonic approach to tackle this task,
 
 Finally, you'll also learn how to **find substrings in pandas columns**. This is helpful if you need to search through data from a CSV file.
 
-Head over to Real Python to the full tutorial on [How to Check if a Python String Contains a Substring](https://realpython.com/python-string-contains-substring/).
+Head over to Real Python for the full tutorial on [How to Check if a Python String Contains a Substring](https://realpython.com/python-string-contains-substring/).

how-to-check-if-a-python-string-contains-a-substring/check_case.py

@@ -1,13 +1,13 @@
-file_content_title = """Hi There And Welcome.
+title_cased_file_content = """Hi There And Welcome.
 This Is A Special Hidden File With A Secret Secret.
 I Don't Want To Tell You The Secret,
 But I Do Want To Secretly Tell You That I Have One."""
 
 # Strings are case-sensitive
-print("secret" in file_content_title)  # False
+print("secret" in title_cased_file_content)  # False
 
 # Convert the input string to lowercase to generalize matching
-file_content = file_content_title.lower()
+file_content = title_cased_file_content.lower()
 
 print(file_content)