Module « collections » Python 3.11.3

Classe « ChainMap »

Informations générales

Héritage

builtins.object
    Container
builtins.object
    Iterable
builtins.object
    Sized
        Collection
            Mapping
                MutableMapping
                    ChainMap

Définition

class ChainMap(MutableMapping):

help(ChainMap)

 A ChainMap groups multiple dicts (or other mappings) together
    to create a single, updateable view.

    The underlying mappings are stored in a list.  That list is public and can
    be accessed or updated using the *maps* attribute.  There is no other
    state.

    Lookups search the underlying mappings successively until a key is found.
    In contrast, writes, updates, and deletions only operate on the first
    mapping.

Constructeur(s)

Signature du constructeur	Description
__init__(self, *maps)	Initialize a ChainMap by setting maps to the given mappings. _{[extrait de __init__.__doc__]}

Liste des propriétés

Nom de la propriété	Description
parents	New ChainMap from maps[1:]. _{[extrait de __doc__]}

Liste des opérateurs

Signature de l'opérateur	Description
__contains__(self, key)
__delitem__(self, key)
__getitem__(self, key)
__ior__(self, other)
__or__(self, other)
__ror__(self, other)
__setitem__(self, key, value)

Opérateurs hérités de la classe Mapping

__eq__

Opérateurs hérités de la classe object

__ge__, __gt__, __le__, __lt__, __ne__

Liste des méthodes

Toutes les méthodes Méthodes d'instance Méthodes statiques

Signature de la méthode	Description
__bool__(self)
__copy__(self)	New ChainMap or subclass with a new copy of maps[0] and refs to maps[1:] _{[extrait de copy.__doc__]}
__iter__(self)
__len__(self)
__missing__(self, key)
__repr__(self)
clear(self)	Clear maps[0], leaving maps[1:] intact. _{[extrait de clear.__doc__]}
copy(self)	New ChainMap or subclass with a new copy of maps[0] and refs to maps[1:] _{[extrait de copy.__doc__]}
fromkeys(iterable, *args)	Create a ChainMap with a single dict created from the iterable. _{[extrait de fromkeys.__doc__]}
get(self, key, default=None)
new_child(self, m=None, **kwargs)	New ChainMap with a new map followed by all previous maps. _{[extrait de new_child.__doc__]}
pop(self, key, *args)	Remove key from maps[0] and return its value. Raise KeyError if key not in maps[0]. _{[extrait de pop.__doc__]}
popitem(self)	Remove and return an item pair from maps[0]. Raise KeyError is maps[0] is empty. _{[extrait de popitem.__doc__]}