pygritia.cast module¶

Provides CastAction action class It provides automatic conversion both direction evaluation and update.

class pygritia.cast.CastAction(expr_type: Any, result_type: Any, expr: Any)[source]¶

Cast action

evaluate(namespace: Mapping[Union[str, LazyMixin], Any]) → Any[source]¶

Evaluate expression

To substitute actual value for specific symbol, give value with keyword argument.

update(val: Any, namespace: Mapping[Union[str, LazyMixin], Any]) → Any[source]¶

Update value of expression

If the expression is readonly, it raises AttributeError

pygritia.cast.lazy_cast(target_type: Callable[[_T], _U], expr: _T, expr_type: Optional[Callable[[_U], _T]] = None) → _U[source]¶

Create automatic casting lazy expression

Parameters:	target_type – Converter from expression type to result type expr – Target expression expr_type – Converter from result type to expression type If it is omitted, the constructor of evaluated expr will be used.
Returns:	Casting expression

Pygritia