Python container是什么


Some objects contain references to other objects; these are called containers. Examples of containers are tuples, lists and dictionaries. The references are part of a container’s value. In most cases, when we talk about the value of a container, we imply the values, not the identities of the contained objects; however, when we talk about the mutability of a container, only the identities of the immediately contained objects are implied. So, if an immutable container (like a tuple) contains a reference to a mutable object, its value changes if that mutable object is changed.

container 英文是容器,望文生义,python container就是包含其它数据类型的一种数据结构或数据类型,tuple,list,dict等都是容器类型。详细解释可常见官方文档

另外,collections模块实现一些专门的容器数据类型,这些数据类型可以替代Python内建容器( dict, list, set, tuple),具体类型如下表所示

namedtuple() factory function for creating tuple subclasses with named fields
deque list-like container with fast appends and pops on either end
ChainMap dict-like class for creating a single view of multiple mappings
Counter dict subclass for counting hashable objects
OrderedDict dict subclass that remembers the order entries were added
defaultdict dict subclass that calls a factory function to supply missing values
UserDict wrapper around dictionary objects for easier dict subclassing
UserList wrapper around list objects for easier list subclassing
UserString wrapper around string objects for easier string subclassing
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