Assign class' staticmethods in static variable in python

Question

I have the following class which produces an error:

class MyClass(object):

    QUERIES_AGGS = {
        'query3': {
            "query": MyClass._make_basic_query,
            'aggregations': MyClass._make_query_three_aggregations,
            'aggregation_transformations': MyClass._make_query_three_transformations
        }
    }


    @staticmethod
    def _make_basic_query():
       #some code here

   @staticmethod
   def _make_query_three_aggregations():
        #some code here

   @staticmethod
   def _make_query_three_transformations(aggs):
        #some code here

For now it won't recognize MyClass. If i remove "MyClass" python won't recognize the functions. I know I could move the static methods from inside the class outside as module functions. Is it possible to keep them inside the class and use them like I am trying?

You should ask yourself why you want a class here at all. Since it only contains static methods and attributes, it doesn't seem to be necessary to make it a class. Python is not Java; in Python the module is perfectly fine as a unit of encapsulation. — Daniel Roseman
– Daniel Roseman, Commented Oct 19, 2016 at 8:41
By the time you're trying to refer to MyClass._make_basic_query, neither the class definition is finished nor the method is defined. — deceze
– deceze ♦, Commented Oct 19, 2016 at 8:44
@DanielRoseman there are more private and public methods inside MyClass. They are just removed for simplicity. — Apostolos
– Apostolos, Commented Oct 19, 2016 at 8:46

Graham Dumpleton · Accepted Answer · 2016-10-19 10:29:04Z

Change the order so that the dictionary is specified after the methods have been defined. Also don't use MyClass when doing so.

class MyClass(object):

    @staticmethod
    def _make_basic_query():
       #some code here
       pass

    @staticmethod
    def _make_query_three_aggregations():
       #some code here
       pass

    @staticmethod
    def _make_query_three_transformations(aggs):
       #some code here
       pass

    QUERIES_AGGS = {
        'query3': {
            "query": _make_basic_query,
            'aggregations': _make_query_three_aggregations,
            'aggregation_transformations': _make_query_three_transformations
        }
    }

This works because when in the body of the class declaration, you can reference methods without needing the class type. What you are referencing has to have already been declared though.

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