Contribution:pyVisitors
== Intent ==
modular programming with [[Visitor pattern|]] in [[Language:Python]]
== Motivation ==
This contribution is similar to [[Contribution:javaVisitor]]. The Visitor Pattern
allows the separation of operations from an object model.
== Illustration ==
There is a method for every class to work on it because python has no method
overloading. The dispatch is done by the Visitor class which uses reflection.
It searches for a method which has the name <code>visit [name]</code>
but if there is not any method, it calls a default method that performs a deeper
traversal.
<syntaxhighlight language="python">
class CutVisitor(Visitor):
def visit Company(self, c):
for d in c.depts:
self.visit(d)