FAQ: Build your own Mini-Blockchain! - Generating Block Hashes

This community-built FAQ covers the “Generating Block Hashes” exercise from the lesson “Build your own Mini-Blockchain!”.

Paths and Courses
This exercise can be found in the following Codecademy content:

Introduction to Blockchain

FAQs on the exercise Generating Block Hashes

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When defining the block content, what is the exact difference between defining it like
block_contents = str(self.timestamp) + …
**self.**block_contents = str(self.timestamp) + …

Welcome to the forums!

Using this, we are creating a block_contents variable within the scope of the generate_hash() method. Simply a variable.

Using this, we are creating a new block_contents instance variable associated with the current object. It is a property of the current object, self.

Side note slightly related to the topic: it’s good practice to define all your instance variables only in the __init___() method and not in other methods.

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Thanks a lot Victoria, all understood.

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Hi, I am receiving the following error message when I run the code:
" Oops! It looks like transactions was not added to the final string."
I double checked the code with the solution and it’s the same code. Then copied the solution into my code area and run it I received the same error message.
What am I missing here?
Thank you.