{'test': [a1, a2, b2], 'test2': 'something else', 'test3': 1}

class testclass():
    self.test = [a1,a2,b2]
    self.test2 = 'someting else'
    self.test3 = 1
testobj = testclass()

{{ testobj.test }}
{{ testobj.test2 }}
{{ testobj.test3 }}

testobj = type('testclass', (object,),
                 {'test':[a1,a2,b2], 'test2':'something else', 'test3':1})()

testobj = {'test':[a1,a2,b2], 'test2':'something else', 'test3':1}

from types import SimpleNamespace
test_obj = SimpleNamespace(a=1, b=lambda: {'hello': 42})

test_obj.a
test_obj.b()

>>>d = {'test':['a1','a2','b2'], 'test2':'something else', 'test3':1}
 >>> class Test(object):
 ...  def __init__(self):
 ...   self.__dict__.update(d)
 >>> a = Test()
 >>> a.test
 ['a1', 'a2', 'b2']
 >>> a.test2
 'something else'

>>> class X:
...     a = 1
...
>>> X = type('X', (object,), dict(a=1))