__dict__ attribute of PathExAttMap is always empty

[afrendeiro]

A little example on how the objects sometimes behave a bit intriguingly:

>>> d = {"key": "value"}
>>> a = AttMap(d)
>>> [x for x in a]
['key']
>>> a.__dict__
{'key': 'value'}

>>> a = PathExAttMap(d)
>>> [x for x in a]
['key']
>>> a.__dict__
{}

I think having a functional __dict__ on any Python object is pretty standard and would be nice if PathExAttMap and the child peppy.Sample would have it too.

[vreuter]

It's because PathExAttMap is ordered. So OrdAttMap also has this behavior, but more general AttMap doesn't, like ordinary dict vs. OrderedDict:

master└─ $ ipython
Python 3.5.2 (default, Nov 23 2017, 16:37:01) 
Type 'copyright', 'credits' or 'license' for more information
IPython 7.2.0 -- An enhanced Interactive Python. Type '?' for help.

In [1]: from attmap import AttMap as AM, OrdAttMap as OAM, PathExAttMap as PXAM                                                                                                                             

In [2]: from collections import OrderedDict                                                                                                                                                                 

In [3]: am = AM()                                                                                                                                                                                           

In [4]: o = OrderedDict()                                                                                                                                                                                   

In [5]: oam = OAM()                                                                                                                                                                                         

In [6]: pxam = PXAM()                                                                                                                                                                                       

In [7]: ds = [am, o, oam, pxam]                                                                                                                                                                             

In [8]: for d in ds: 
   ...:     d["a"] = 1 
   ...:                                                                                                                                                                                                     

In [9]: [m.items() for d in ds]                                                                                                                                                                             
---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-9-83e8b68a814e> in <module>
----> 1 [m.items() for d in ds]

<ipython-input-9-83e8b68a814e> in <listcomp>(.0)
----> 1 [m.items() for d in ds]

NameError: name 'm' is not defined

In [10]: [d.items() for d in ds]                                                                                                                                                                            
Out[10]: 
[ItemsView(AttMap
 a: 1), odict_items([('a', 1)]), [('a', 1)], [('a', 1)]]

In [11]: [d.__dict__ for d in ds]                                                                                                                                                                           
Out[11]: [{'a': 1}, {}, {}, {}]