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Xu Tian edited this page Dec 30, 2016 · 1 revision

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virttest.staging.backports.collections package

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virttest.staging.backports.collections.OrderedDict module

Backport of OrderedDict() class that runs on Python 2.4, 2.5, 2.6, 2.7 and pypy. Passes Python2.7’s test suite and incorporates all the latest updates.

Obtained from: http://code.activestate.com/recipes/576693-ordered-dictionary-for-py24/

classvirttest.staging.backports.collections.OrderedDict.``OrderedDict(*args, **kwds)
Bases: dict

Dictionary that remembers insertion order

http://code.activestate.com/recipes/576693-ordered-dictionary-for-py24/ :codeauthor: Raymond Hettinger :license: MIT

Initialize an ordered dictionary.

Signature is the same as for regular dictionaries, but keyword arguments are not recommended because their insertion order is arbitrary.

clear() → None. Remove all items from od.

copy() → a shallow copy of od

classmethodfromkeys(S[, v]) → New ordered dictionary with keys from S
and values equal to v (which defaults to None).

items() → list of (key, value) pairs in od

iteritems()
od.iteritems -> an iterator over the (key, value) items in od

iterkeys() → an iterator over the keys in od

itervalues()
od.itervalues -> an iterator over the values in od

keys() → list of keys in od

pop(k[, d]) → v, remove specified key and return the corresponding
value.

If key is not found, d is returned if given, otherwise KeyError is raised.

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.

setdefault(k[, d]) → od.get(k,d), also set od[k]=d if k not in od

update(E, **F) → None. Update od from dict/iterable E and F.
If E is a dict instance, does: for k in E: od[k] = E[k] If E has a .keys() method, does: for k in E.keys(): od[k] = E[k] Or if E is an iterable of items, does: for k, v in E: od[k] = v In either case, this is followed by: for k, v in F.items(): od[k] = v

values() → list of values in od

viewitems() → a set-like object providing a view on od's items

viewkeys() → a set-like object providing a view on od's keys

viewvalues() → an object providing a view on od's values

virttest.staging.backports.collections.defaultdict module

Backport of the defaultdict module, obtained from: http://code.activestate.com/recipes/523034-emulate-collectionsdefaultdict/

classvirttest.staging.backports.collections.defaultdict.``defaultdict(default_factory=None, *a, **kw)
Bases: dict

collections.defaultdict is a handy shortcut added in Python 2.5 which can be emulated in older versions of Python. This recipe tries to backport defaultdict exactly and aims to be safe to subclass and extend without worrying if the base class is in C or is being emulated.

http://code.activestate.com/recipes/523034-emulate-collectionsdefaultdict/ :codeauthor: Jason Kirtland :license: PSF

Changes: * replaced self.items() with self.iteritems() to fix Pickle bug as recommended by Aaron Lav * reformated with autopep8

copy()

virttest.staging.backports.collections.namedtuple module

This module contains a backport for collections.namedtuple obtained from http://code.activestate.com/recipes/500261-named-tuples/

virttest.staging.backports.collections.namedtuple.``namedtuple(typename, field_names, verbose=False, rename=False)
Returns a new subclass of tuple with named fields.

>>> Point = namedtuple('Point', 'x y')
>>> Point.__doc__                   # docstring for the new class
'Point(x, y)'
>>> p = Point(11, y=22)             # instantiate with positional args or keywords
>>> p[0] + p[1]                     # indexable like a plain tuple
33
>>> x, y = p                        # unpack like a regular tuple
>>> x, y
(11, 22)
>>> p.x + p.y                       # fields also accessible by name
33
>>> d = p._asdict()                 # convert to a dictionary
>>> d['x']
11
>>> Point(**d)                      # convert from a dictionary
Point(x=11, y=22)
>>> p._replace(x=100)               # _replace() is like str.replace() but targets named fields
Point(x=100, y=22)

http://code.activestate.com/recipes/500261-named-tuples/ :codeauthor: Raymond Hettinger :license: PSF

Changes: * autopep8 reformatting

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