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graphics, we wanted to be able to declare the attributes of a class, check
them on assignment, and convert from string arguments. Examples of
attrmap-based objects can be found in reportlab/graphics/shapes. It lets
us defined structures like the one below, which are seen more modern form in
Django models and other frameworks.
We'll probably replace this one day soon, hopefully with no impact on client
code.
class Rect(SolidShape):
"""Rectangle, possibly with rounded corners."""
_attrMap = AttrMap(BASE=SolidShape,
x = AttrMapValue(isNumber),
y = AttrMapValue(isNumber),
width = AttrMapValue(isNumber),
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