The Program Crashed, Politely

The situation

An unexpected creator export — one row has a blank follower count — crashes the weekly report and prints a raw Python traceback into a channel a creator can read.

What you'll learn

• PCEP 4.3-4.4 and PCAP 2.1-2.2: the exception hierarchy, matching except clauses, propagation, raise and assert, and defining a small custom exception.
• The built-in exceptions (ZeroDivisionError, IndexError, KeyError, ValueError, TypeError, NameError), the hierarchy (BaseException, Exception, ArithmeticError, LookupError) and ordering except branches from specific to general. The readiness gate now has 22 items across the four exam domains.

Who you work with

• 

  Maya Chen

  Senior AI Engineer · Your mentor

• 

  Lydia Roe

  Security Engineer

Scenes

1. 1.Fail on purpose
2. 2.Which handler runs?
3. 3.Which exception is this?
4. 4.Fail safe, keep going
5. 5.Don't swallow everything
6. 6.PCEP readiness gate

What you leave with

You handled the supplied invalid follower field with ValueError, a permitted skip diagnostic to stderr and a total from valid rows. You also identified why a blanket handler hid incomplete results. Stream separation keeps the fixture output clean; it does not establish diagnostic privacy or exam readiness.