Lesson 5.1
Reading and Writing Files
A context manager opens a file and guarantees it is closed even if an error occurs partway through.
Lessons and exercises
Where Python stops being an exercise and starts touching real data. The unit adds a new category of failure: the input may be missing, malformed, or unavailable, and correct code has to survive that.
Lesson 5.2
Structured Formats
CSV and JSON carry structure that plain text does not. Parsing with the right module avoids hand-splitting that breaks on quoted fields.
Lesson 5.3
Consuming APIs
An API returns structured data over the network, and both the request and the response can fail independently of your code being correct.
Lesson 5.4
Error Handling and Automation
Exception handling separates the expected path from the recovery path. Catching everything hides the bugs you needed to see.
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