The 6 pillars

The 6 pillars of izulu

• all behavior is defined on the class-level

• __template__ class attribute defines the template for target error message

  • template may contain “fields” for substitution from kwargs and “defaults” to produce final error message

• __toggles__ class attribute defines constraints and behaviour (see “Toggles” section below)

  • by default all constraints are enabled

• “class hints” annotated with ClassVar are noted by izulu

  • annotated class attributes normally should have values (treated as “class defaults”)

  • “class defaults” can only be static

  • “class defaults” may be referred within __template__

• “instance hints” regularly annotated (not with ClassVar) are noted by izulu

  • all annotated attributes are treated as “instance attributes”

  • each “instance attribute” will automatically obtain value from the kwarg of the same name

  • “instance attributes” with default are also treated as “instance defaults”

  • “instance defaults” may be static and dynamic

  • “instance defaults” may be referred within __template__

• kwargs — the new and main way to form exceptions/error instance

  • forget about creating exception instances from message strings

  • kwargs are the datasource for template “fields” and “instance attributes” (shared input for templating attribution)

Warning

Types from type hints are not validated or enforced!