Changing DictMixin.iterkeys to MutableMapping

Question

I'm looking to use OrderedDict in my code since the Ruby version of this project uses YAML for maps and settings but OrderedDict hasn't been updated for Python 3.

The Ruby version of the project uses this file: https://mega.co.nz/#!zhYRwA4B!HceqC3-NmmN44U70--jMxiAWQ4wz5MdAeilteKAOnSM

I changed the import lines to read as:

from collections import UserDict
from collections import MutableMapping as DictMixin

I already know v3 doesn't make use of iterkeys so how would I change iterkeys to something MutableMapping understands?

iterkeys = DictMixin.iterkeys
itervalues = DictMixin.itervalues
iteritems = DictMixin.iteritems

I've seen many examples of how to change it but I don't understand how to use them here.

Maybe I should use something else for YAML file support in Python 3, perhaps?

Edit: I called my file yaml.py. I shouldn't have done that. I also had a file path in there it didn't like. I've removed it and it works.

Edit 2: I've just realised I've screwed up my question. It should have been about OMAPs in Python not YAML. I'll open a different question for that. Thanks for the help guys.

Answer 1

Step by step:

1. Create python 3 vitrtualenv

   mkvirtualenv -p python3 testyaml
   

2. Install pyaml inside virtualenv

   pip install pyaml
   

3. Now create some yaml file (example from https://en.wikipedia.org/wiki/YAML#Examples):

   receipt:     Oz-Ware Purchase Invoice
   date:        2012-08-06
   customer:
       given:   Dorothy
       family:  Gale
   
   items:
       - part_no:   A4786
         descrip:   Water Bucket (Filled)
         price:     1.47
         quantity:  4
   
       - part_no:   E1628
         descrip:   High Heeled "Ruby" Slippers
         size:      8
         price:     100.27
         quantity:  1
   
   bill-to:  &id001
       street: |
               123 Tornado Alley
               Suite 16
       city:   East Centerville
       state:  KS
   
   ship-to:  *id001
   
   specialDelivery:  >
       Follow the Yellow Brick
       Road to the Emerald City.
       Pay no attention to the
       man behind the curtain.
   

4. And python script

   import yaml
   
   d = yaml.load(open('foo.yaml'))
   
   print(d.keys())
   print(d.values())
   

5. Run script

   python3 foo.py
   

6. Check results