You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
112 lines
3.0 KiB
112 lines
3.0 KiB
4 years ago
|
"""
|
||
|
A dict subclass for Python 2 that behaves like Python 3's dict
|
||
|
|
||
|
Example use:
|
||
|
|
||
|
>>> from 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 iterators on Python 2.x
|
||
|
(with set-like behaviour on Python 2.7).
|
||
|
|
||
|
>>> for d in (d1, d2):
|
||
|
... assert not isinstance(d.keys(), list)
|
||
|
... assert not isinstance(d.values(), list)
|
||
|
... assert not isinstance(d.items(), list)
|
||
|
"""
|
||
|
|
||
|
import sys
|
||
|
|
||
|
from future.utils import with_metaclass
|
||
|
from future.types.newobject import newobject
|
||
|
|
||
|
|
||
|
_builtin_dict = dict
|
||
|
ver = sys.version_info[:2]
|
||
|
|
||
|
|
||
|
class BaseNewDict(type):
|
||
|
def __instancecheck__(cls, instance):
|
||
|
if cls == newdict:
|
||
|
return isinstance(instance, _builtin_dict)
|
||
|
else:
|
||
|
return issubclass(instance.__class__, cls)
|
||
|
|
||
|
|
||
|
class newdict(with_metaclass(BaseNewDict, _builtin_dict)):
|
||
|
"""
|
||
|
A backport of the Python 3 dict object to Py2
|
||
|
"""
|
||
|
def items(self):
|
||
|
"""
|
||
|
On Python 2.7+:
|
||
|
D.items() -> a set-like object providing a view on D's items
|
||
|
On Python 2.6:
|
||
|
D.items() -> an iterator over D's items
|
||
|
"""
|
||
|
if ver == (2, 7):
|
||
|
return self.viewitems()
|
||
|
elif ver == (2, 6):
|
||
|
return self.iteritems()
|
||
|
elif ver >= (3, 0):
|
||
|
return self.items()
|
||
|
|
||
|
def keys(self):
|
||
|
"""
|
||
|
On Python 2.7+:
|
||
|
D.keys() -> a set-like object providing a view on D's keys
|
||
|
On Python 2.6:
|
||
|
D.keys() -> an iterator over D's keys
|
||
|
"""
|
||
|
if ver == (2, 7):
|
||
|
return self.viewkeys()
|
||
|
elif ver == (2, 6):
|
||
|
return self.iterkeys()
|
||
|
elif ver >= (3, 0):
|
||
|
return self.keys()
|
||
|
|
||
|
def values(self):
|
||
|
"""
|
||
|
On Python 2.7+:
|
||
|
D.values() -> a set-like object providing a view on D's values
|
||
|
On Python 2.6:
|
||
|
D.values() -> an iterator over D's values
|
||
|
"""
|
||
|
if ver == (2, 7):
|
||
|
return self.viewvalues()
|
||
|
elif ver == (2, 6):
|
||
|
return self.itervalues()
|
||
|
elif ver >= (3, 0):
|
||
|
return self.values()
|
||
|
|
||
|
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(newdict, cls).__new__(cls)
|
||
|
elif type(args[0]) == newdict:
|
||
|
value = args[0]
|
||
|
else:
|
||
|
value = args[0]
|
||
|
return super(newdict, cls).__new__(cls, value)
|
||
|
|
||
|
def __native__(self):
|
||
|
"""
|
||
|
Hook for the future.utils.native() function
|
||
|
"""
|
||
|
return dict(self)
|
||
|
|
||
|
|
||
|
__all__ = ['newdict']
|