CompositeVisitor

class mlfarm.core.CompositeVisitor(*args)

The visit method of this class will chain the object trough all the visitor parameters.

Parameters:*args – Arguments as a list, each should be an implementation of the BaseVisitor class.

>>> class StrVisitor(BaseVisitor):
...     def visit_str(self, obj):
...         if obj == 'nok':
...             return 0
...         return obj
...
>>> class ListVisitor(BaseVisitor):
...     def visit_list(self, obj):
...         try:
...             return sum(obj)
...         except:
...             return super().visit_list(obj)
...
>>> vl = [
...    StrVisitor(),
...    ListVisitor()
... ]
...
>>> cv = CompositeVisitor(*vl)
>>> a = {'a': [1, 2, 3], 'b': 'ok', 'c': [1, 2, 'nok']}
>>> bo = vl[0].visit(a)
>>> bo
{'a': [1, 2, 3], 'b': 'ok', 'c': [1, 2, 0]}
>>> bo = vl[1].visit(bo)
>>> o = cv.visit(a)
>>> o == bo
True
>>> o
{'a': 6, 'b': 'ok', 'c': 3}

visit(obj)

This method is to be called on the object to be transformed.

Parameters:obj (str | object | list | dict) – Object to be transformed. Returns:The output of the transformation. Return type:str | object | list | dict