PYTHON : TypeError: unhashable type: 'list' when using built-in set function

PYTHON : TypeError: unhashable type: 'list' when using built-in set function
To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

As promised, I'm going to share a hidden feature with you.
This is a YouTube's feature which works on Desktop.
First, Make sure this video is playing.
Then, type the letters 'awesome' on your keyboard as the next step.
Your YouTube progress bar will transform into a flashing rainbow.

An introduction to myself in a few words,
Hey, I'm known as Delphi.
Let me help you with your questions.
PYTHON : TypeError: unhashable type: 'list' when using built-in set function
If you have a more detailed question, feel free to comment or chat with me to let me know.
Your thoughts and contributions are welcome, so please leave a comment below if you have an answer or insights to the answer.
If you provide an answer, I will 'heart' it as a sign of gratitude.
TypeError: 'list' unhashable using function when set type: built-in : PYTHON