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//proc/self/root/lib/python2.7/site-packages/past/types/olddict.py

"""
A dict subclass for Python 3 that behaves like Python 2's dict

Example use:

>>> from past.builtins import dict
>>> d1 = dict()    # instead of {} for an empty dict
>>> d2 = dict(key1='value1', key2='value2')

The keys, values and items methods now return lists on Python 3.x and there are
methods for iterkeys, itervalues, iteritems, and viewkeys etc.

>>> for d in (d1, d2):
...     assert isinstance(d.keys(), list)
...     assert isinstance(d.values(), list)
...     assert isinstance(d.items(), list)
"""

import sys

from past.utils import with_metaclass

_builtin_dict = dict
ver = sys.version_info[:2]

class BaseOldDict(type):
    def __instancecheck__(cls, instance):
        return isinstance(instance, _builtin_dict)

class olddict(with_metaclass(BaseOldDict, _builtin_dict)):
    """
    A backport of the Python 3 dict object to Py2
    """
    iterkeys = _builtin_dict.keys
    viewkeys = _builtin_dict.keys

def keys(self):
        return list(super(olddict, self).keys())

itervalues = _builtin_dict.values
    viewvalues = _builtin_dict.values

def values(self):
        return list(super(olddict, self).values())

iteritems = _builtin_dict.items
    viewitems = _builtin_dict.items

def items(self):
        return list(super(olddict, self).items())

def has_key(self, k):
        """
        D.has_key(k) -> True if D has a key k, else False
        """
        return k in self

# def __new__(cls, *args, **kwargs):
    #     """
    #     dict() -> new empty dictionary
    #     dict(mapping) -> new dictionary initialized from a mapping object's
    #         (key, value) pairs
    #     dict(iterable) -> new dictionary initialized as if via:
    #         d = {}
    #         for k, v in iterable:
    #             d[k] = v
    #     dict(**kwargs) -> new dictionary initialized with the name=value pairs
    #         in the keyword argument list.  For example:  dict(one=1, two=2)

#     """
    #
    #     if len(args) == 0:
    #         return super(olddict, cls).__new__(cls)
    #     # Was: elif isinstance(args[0], newbytes):
    #     # We use type() instead of the above because we're redefining
    #     # this to be True for all unicode string subclasses. Warning:
    #     # This may render newstr un-subclassable.
    #     elif type(args[0]) == olddict:
    #         return args[0]
    #     # elif isinstance(args[0], _builtin_dict):
    #     #     value = args[0]
    #     else:
    #         value = args[0]
    #     return super(olddict, cls).__new__(cls, value)

def __native__(self):
        """
        Hook for the past.utils.native() function
        """
        return super(oldbytes, self)

__all__ = ['olddict']