Test of various ways to store fields in Python

test.py

# vim: set fileencoding=utf-8
import sys, os, re, glob, copy
from collections import namedtuple

#
# It's critical to inherit all classes from "object" base class

def get_size(obj, seen=None):
    """Recursively finds size of objects"""
    size = sys.getsizeof(obj)
    if seen is None:
        seen = set()
    obj_id = id(obj)
    if obj_id in seen:
        return 0
    # Important mark as seen *before* entering recursion to gracefully handle
    # self-referential objects
    seen.add(obj_id)
    if isinstance(obj, dict):
        size += sum([get_size(v, seen) for v in obj.values()])
        size += sum([get_size(k, seen) for k in obj.keys()])
    elif hasattr(obj, '__dict__'):
        size += get_size(obj.__dict__, seen)
    elif hasattr(obj, '__iter__') and not isinstance(obj, (str, bytes, bytearray)):
        size += sum([get_size(i, seen) for i in obj])
    return size

TupleObj = (0.0, 1.0, 2.0, 3.0, 4.0)

class ClassEmpty(object): 
    def __init__(self):
        pass

class ClassFields(object):
    def __init__(self):
        self.Field0 = 0.0
        self.Field1 = 1.0 
        self.Field2 = 2.0
        self.Field3 = 3.0
        self.Field4 = 4.0

class ClassFieldsSlots(object):
    __slots__ = ('Field0', 'Field1', 'Field2', 'Field3', 'Field4')

    def __init__(self):
        self.Field0 = 0.0
        self.Field1 = 1.0
        self.Field2 = 2.0
        self.Field3 = 3.0
        self.Field4 = 4.0

class ClassNamedTuple(namedtuple('ClassNamedTuple', ['Field0', 'Field1', 'Field2', 'Field3', 'Field4'])):
    __slots__ = ()
    pass

"""
It was bad idea
class ClassVector(object):
    PosField0 = 0
    PosFieldsCount = PosField0 + 1

    def __init__(self):
        self.Values = [0.0] * self.PosFieldsCount

    Field0 = property()
    @Field0.getter
    def Field0(self): return self.Values[self.PosField0]
    @Field0.setter
    def Field0(self, v): self.Values[self.PosField0] = v
"""

print "namedtuple", get_size(namedtuple('N', [])())
print "Tuple size 5", get_size(TupleObj)
print "ClassEmpty", get_size(ClassEmpty())
print "ClassFields", get_size(ClassFields())
print "ClassFieldsSlots", get_size(ClassFieldsSlots())
print "ClassNamedTuple", get_size(ClassNamedTuple(0.0, 1.0, 2.0, 3.0, 4.0))

cf = ClassFields()
cf.Fields5 = 5.0
cs = ClassFieldsSlots()
#cs.Fields5 = 5.0 error
cn = ClassNamedTuple(0.0, 1.0, 2.0, 3.0, 4.0)
#cn.Fields5 = 5.0 # error
print "Tuple size 5", dir(TupleObj)
print "ClassEmpty", dir(ClassEmpty())
print "ClassFields", dir(cf)
print "ClassFieldsSlots", dir(cs)
print "ClassNamedTuple", dir(cn)

"""
namedtuple 352
Tuple size 5 216
ClassEmpty 344
ClassFields 679
ClassFieldsSlots 88
ClassNamedTuple 727
Tuple size 5 ['__add__', '__class__', '__contains__', '__delattr__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__', '__getnewargs__', '__getslice__', '__gt__', '__hash__', '__init__', '__iter__', '__le__', '__len__', '__lt__', '__mul__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__rmul__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', 'count', 'index']
ClassEmpty ['__class__', '__delattr__', '__dict__', '__doc__', '__format__', '__getattribute__', '__hash__', '__init__', '__module__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__']
ClassFields ['Field0', 'Field1', 'Field2', 'Field3', 'Field4', 'Fields5', '__class__', '__delattr__', '__dict__', '__doc__', '__format__', '__getattribute__', '__hash__', '__init__', '__module__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__']
ClassFieldsSlots ['Field0', 'Field1', 'Field2', 'Field3', 'Field4', '__class__', '__delattr__', '__doc__', '__format__', '__getattribute__', '__hash__', '__init__', '__module__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__slots__', '__str__', '__subclasshook__']
ClassNamedTuple ['Field0', 'Field1', 'Field2', 'Field3', 'Field4', '__add__', '__class__', '__contains__', '__delattr__', '__dict__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__', '__getnewargs__', '__getslice__', '__getstate__', '__gt__', '__hash__', '__init__', '__iter__', '__le__', '__len__', '__lt__', '__module__', '__mul__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__rmul__', '__setattr__', '__sizeof__', '__slots__', '__str__', '__subclasshook__', '_asdict', '_fields', '_make', '_replace', 'count', 'index']
"""