created subclass Pair representing a key-value pair in the dictionary
created subclass Pair representing a key-value pair in the dictionary

in the future, we could make Pair inherit from Dictionary, to have
imbricated dictionaries

arpitgoyaiitkgp/django-mongoengine,seraphlnWu/django-mongoengine,vetional/django-mongoengine,arpitgoyaiitkgp/django-mongoengine,arpitgoyaiitkgp/django-mongoengine,vetional/django-mongoengine,vetional/django-mongoengine,seraphlnWu/django-mongoengine,seraphlnWu/django-mongoengine