/usr/lib/python2.7/dist-packages/pyfits/_compat/_odict_py2/__init__.py is in python-pyfits 1:3.4-4ubuntu1.
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"""
Backport of the Python 2.7 collections.OrderedDict class to Python 2.6.
Ordered dictionaries are just like regular dictionaries but they remember the
order that items were inserted. When iterating over an ordered dictionary,
the items are returned in the order their keys were first added.
See: http://docs.python.org/library/collections.html#collections.OrderedDict
"""
from __future__ import absolute_import
__all__ = ['OrderedDict']
from collections import MutableMapping
from operator import eq as _eq
from itertools import imap as _imap
try:
from thread import get_ident
except ImportError:
from dummy_thread import get_ident
def _recursive_repr(user_function):
'Decorator to make a repr function return "..." for a recursive call'
repr_running = set()
def wrapper(self):
key = id(self), get_ident()
if key in repr_running:
return '...'
repr_running.add(key)
try:
result = user_function(self)
finally:
repr_running.discard(key)
return result
# Can't use functools.wraps() here because of bootstrap issues
wrapper.__module__ = getattr(user_function, '__module__')
wrapper.__doc__ = getattr(user_function, '__doc__')
wrapper.__name__ = getattr(user_function, '__name__')
return wrapper
class OrderedDict(dict, MutableMapping):
'Dictionary that remembers insertion order'
# An inherited dict maps keys to values.
# The inherited dict provides __getitem__, __len__, __contains__, and get.
# The remaining methods are order-aware.
# Big-O running times for all methods are the same as for regular dictionaries.
# The internal self.__map dictionary maps keys to links in a doubly linked list.
# The circular doubly linked list starts and ends with a sentinel element.
# The sentinel element never gets deleted (this simplifies the algorithm).
# Each link is stored as a list of length three: [PREV, NEXT, KEY].
def __init__(self, *args, **kwds):
'''Initialize an ordered dictionary. Signature is the same as for
regular dictionaries, but keyword arguments are not recommended
because their insertion order is arbitrary.
'''
if len(args) > 1:
raise TypeError('expected at most 1 arguments, got %d' % len(args))
try:
self.__root
except AttributeError:
self.__root = root = [None, None, None] # sentinel node
PREV = 0
NEXT = 1
root[PREV] = root[NEXT] = root
self.__map = {}
self.update(*args, **kwds)
def __setitem__(self, key, value, PREV=0, NEXT=1, dict_setitem=dict.__setitem__):
'od.__setitem__(i, y) <==> od[i]=y'
# Setting a new item creates a new link which goes at the end of the linked
# list, and the inherited dictionary is updated with the new key/value pair.
if key not in self:
root = self.__root
last = root[PREV]
last[NEXT] = root[PREV] = self.__map[key] = [last, root, key]
dict_setitem(self, key, value)
def __delitem__(self, key, PREV=0, NEXT=1, dict_delitem=dict.__delitem__):
'od.__delitem__(y) <==> del od[y]'
# Deleting an existing item uses self.__map to find the link which is
# then removed by updating the links in the predecessor and successor nodes.
dict_delitem(self, key)
link = self.__map.pop(key)
link_prev = link[PREV]
link_next = link[NEXT]
link_prev[NEXT] = link_next
link_next[PREV] = link_prev
def __iter__(self, NEXT=1, KEY=2):
'od.__iter__() <==> iter(od)'
# Traverse the linked list in order.
root = self.__root
curr = root[NEXT]
while curr is not root:
yield curr[KEY]
curr = curr[NEXT]
def __reversed__(self, PREV=0, KEY=2):
'od.__reversed__() <==> reversed(od)'
# Traverse the linked list in reverse order.
root = self.__root
curr = root[PREV]
while curr is not root:
yield curr[KEY]
curr = curr[PREV]
def __reduce__(self):
'Return state information for pickling'
items = [[k, self[k]] for k in self]
tmp = self.__map, self.__root
del self.__map, self.__root
inst_dict = vars(self).copy()
self.__map, self.__root = tmp
if inst_dict:
return (self.__class__, (items,), inst_dict)
return self.__class__, (items,)
def clear(self):
'od.clear() -> None. Remove all items from od.'
try:
for node in self.__map.itervalues():
del node[:]
self.__root[:] = [self.__root, self.__root, None]
self.__map.clear()
except AttributeError:
pass
dict.clear(self)
setdefault = MutableMapping.setdefault
update = MutableMapping.update
pop = MutableMapping.pop
keys = MutableMapping.keys
values = MutableMapping.values
items = MutableMapping.items
iterkeys = MutableMapping.iterkeys
itervalues = MutableMapping.itervalues
iteritems = MutableMapping.iteritems
__ne__ = MutableMapping.__ne__
def popitem(self, last=True):
'''od.popitem() -> (k, v), return and remove a (key, value) pair.
Pairs are returned in LIFO order if last is true or FIFO order if false.
'''
if not self:
raise KeyError('dictionary is empty')
key = next(reversed(self) if last else iter(self))
value = self.pop(key)
return key, value
@_recursive_repr
def __repr__(self):
'od.__repr__() <==> repr(od)'
if not self:
return '%s()' % (self.__class__.__name__,)
return '%s(%r)' % (self.__class__.__name__, self.items())
def copy(self):
'od.copy() -> a shallow copy of od'
return self.__class__(self)
@classmethod
def fromkeys(cls, iterable, value=None):
'''OD.fromkeys(S[, v]) -> New ordered dictionary with keys from S
and values equal to v (which defaults to None).
'''
d = cls()
for key in iterable:
d[key] = value
return d
def __eq__(self, other):
'''od.__eq__(y) <==> od==y. Comparison to another OD is order-sensitive
while comparison to a regular mapping is order-insensitive.
'''
if isinstance(other, OrderedDict):
return len(self)==len(other) and \
all(_imap(_eq, self.iteritems(), other.iteritems()))
return dict.__eq__(self, other)
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