Quick study sessions to strengthen memory and retain key concepts.
When does invariants in __post_init__ need a refactor?
When the rule is no longer easy to explain, test, or change without surprising nearby code. Refactoring is…
View Card →What production lens matters for invariants in __post_init__?
Assume the simple demo is not enough. Real data volume, partner behavior, and partial failures will pressure the…
View Card →What review lens should you apply to invariants in __post_init__ code?
Ask whether the next engineer can see the rule, the data shape, and the likely failure mode quickly.…
View Card →What testing lens fits invariants in __post_init__?
Test the boundary cases and invariants that would silently break if the rule were misunderstood. Good tests preserve…
View Card →What debugging lens helps most with invariants in __post_init__?
Trace one real example, inspect the state changes, and compare them to the rule you intended to implement.…
View Card →Why does OrderOps care about invariants in __post_init__?
Because the toolkit now carries orders, lines, customers, and inventory concepts that deserve clearer state and behavior than…
View Card →What is the best default for invariants in __post_init__?
Choose the simplest shape that keeps the rule explicit, testable, and easy for the next engineer to read.…
View Card →How should you explain invariants in __post_init__ in an interview?
Enforce the basic invariant when the object is created so the rest of the code can trust the…
View Card →What is the main pitfall around invariants in __post_init__?
Letting invalid objects exist and hoping later code cleans them up makes bugs harder to localize. Naming the…
View Card →What is the core rule behind invariants in __post_init__?
Enforce the basic invariant when the object is created so the rest of the code can trust the…
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