ucollections - Collection and Container Types

Module features: ucollections module can create a container type that saves various objects. This module realizes subsets of the corresponding CPython module. See CPython file collections for more detailed information.

ucollections Method

ucollections.namedtuple

mytuple = ucollections.namedtuple(name, fields)

Creates a namedtuple container type with a specific name and a set of fields. namedtuple is a subclass of the tuple that allows its fields to be accessed by index.

Parameter

• name - String type. Type name of the new container.
• fields - Tuple type. The new container type contains fields of the subtype.

Example

>>> import ucollections
>>> mytuple = ucollections.namedtuple("mytuple", ("id", "name"))
>>> t1 = mytuple(1, "foo")
>>> t2 = mytuple(2, "bar")
>>> print(t1.name)
foo

ucollections.deque

ucollections.deque(iterable, maxlen, flag)

Creates a bidirectional queue for deque.

Parameter

• iterable - Tuple type. It must be an empty tuple.
• maxlen - Integer type. Specifies maxlen and limits the bidirectional queue to its maximum length.
• flag - Integer type. Optional parameter; 0 (default): Not check whether the queue overflows. If the queue continues to increase when it reaches the maximum length, the previous value will be discarded. 1: When the queue reaches the maximum specified length, IndexError: full will be displayed.

Return Value:

• deque object.

deque Object Methods

deque.append

sdeque.append(data)

Inserts values into the queue.

Parameter

• data - Basic data type. Values need to be added to the queue.

deque.popleft

deque.popleft()

Removes the data on the left side of deque and returns the removed data. If deque is empty, it will lead to an index error.

Return Value

• Returns the popped value.

Example

from ucollections import deque

>>> dq = deque((),5)
>>> dq.append(1)
>>> dq.append(['a'])
>>> dq.append('a')

>>> dq.popleft()
1
>>> dq.popleft()
['a']
>>> dq.popleft()
'a'