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cllist is an extension module for CPython providing basic linked list data structures.
Collections implemented in the llist module perform well in problems which rely on fast insertions, pops, and removal of elements in the middle of a sequence.
For this kind of workload, they can be significantly faster than collections.deque or standard Python lists.
This project was forked from https://github.com/ajakubek/python-llist
and adds many features and enhancements to the original, under a new name "cllist".
The cllist version now lives at https://github.com/kata198/python-cllist
If you were using the previous module, you can change to this new module, it is completely backwards (but not forwards) compatible.
Singly linked lists are provided by the "sllist" module. This is your basic single-linked list, and might be useful for some scenarios.
A single linked list is far less efficient at everything than the double-linked list implementation.
A double-linked list is provided by the "dllist" module.
This provides great performance when doing pops and insertions at random (in the middle), or at either end.
This implementation has been enhanced by implementing a "middle" marker.
This "middle" marker is used when the list size exceeds 10 elements, and is used in all operations which involve walking the list,
which ensures that AT MOST N/4 elements will need to be walked (so the shortest distance from either start, middle, or end is calculated, and walked from there).
This additional feature makes this linked list much more efficient on larger data sets than a standard double-linked list implementation.
A linked list should be used when you are going to be adding or removing elements in the middle of the dataset. A standard python list forces the entire list to be reallocated and copied when such happens, whereas this can do so without reallocating.
Documentation can be found at: https://pythonhosted.org/cllist/
FAQs
C-implemented linked-list module for Python
We found that cllist demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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