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Good comments signal assumptions and protect your code from breaking when someone else reads it. Learn when to comment, what to say, and how to build the habit so your code is safe to hand over and clear enough to audit.
Jupyter Notebook is where you write Python code, see the output immediately, and document your reasoning all in one place. For treasury and regulatory reporting, it is the tool between learning and production.
Jupyter Notebook is where finance practitioners solve real problems with Python. It gives you immediate feedback on your code, lets you document your logic as you work, and creates an audit trail that regulators and auditors actually want to see.