| Name | prqrs JSON |
| Version |
0.1.0
JSON |
| download |
| home_page | None |
| Summary | Benchmarked priority queue implementation in Rust |
| upload_time | 2023-12-28 21:36:03 |
| maintainer | None |
| docs_url | None |
| author | None |
| requires_python | >=3.10, <3.12 |
| license | MIT |
| keywords |
priority queue
pyo3
|
| VCS |
|
| bugtrack_url |
|
| requirements |
No requirements were recorded.
|
| Travis-CI |
No Travis.
|
| coveralls test coverage |
No coveralls.
|
# prqrs
> Python priority queue in Rust via pyo3
<!-- [](https://pypi.org/project/prqrs) -->
<!-- [](https://results.pre-commit.ci/latest/github/lmmx/prqrs/master) -->
<!-- [](https://pypi.org/project/prqrs) -->
[](https://pdm.fming.dev)
[](https://github.com/lmmx/prqrs/blob/main/LICENSE)
The `prqrs` package provides a simple interface to a priority queue implemented in Rust. This
guide will show you how to create a priority queue, add items to it, and retrieve items based on
their priority.
## Installation
<!-- First, ensure that the prqrs package is installed.
```sh
pip install prqrs
```
-->
To build the Rust project from source run:
```sh
maturin develop --release
```
Alternatively using the PDM package manager, just run `pdm install`.
## Usage
### Creating a Priority Queue
To create a priority queue, import the `PriorityQueue` class from the `prqrs` package and
instantiate it:
```py
from prqrs import PriorityQueue
pq = PriorityQueue()
```
### Creating Items
Items that can be added to the priority queue need a value and a priority.
Import the `Item` class and create items:
```py
from prqrs import Item
item1 = Item(value=5, priority=3) # An item with value 5 and priority 3
item2 = Item(value=10, priority=1) # An item with value 10 and priority 1
```
### Adding Items to the Queue
Add items to the queue using the push method:
```py
pq.push(item1)
pq.push(item2)
```
### Retrieving Items from the Queue
Retrieve items based on their priority using the `pop` method.
This method returns the item with the highest priority (lowest numerical value of priority):
```py
highest_priority_item = pq.pop()
if highest_priority_item is not None:
print(f"Value: {highest_priority_item.value}, Priority: {highest_priority_item.priority}")
```
### Checking if the Queue is Empty
To check whether the priority queue is empty, use the `is_empty` method:
```py
if pq.is_empty():
print("The priority queue is empty.")
else:
print("The priority queue is not empty.")
```
### Example
Here is a complete example that demonstrates creating a priority queue, adding items, and retrieving
them:
```py
from prqrs import PriorityQueue, Item
# Create a priority queue
pq = PriorityQueue()
# Add items
pq.push(Item(value=5, priority=3))
pq.push(Item(value=10, priority=1))
pq.push(Item(value=7, priority=2))
# Retrieve and print items
while not pq.is_empty():
item = pq.pop()
print(f"Value: {item.value}, Priority: {item.priority}")
```
This will output
```
Value: 5, Priority: 3
Value: 7, Priority: 2
Value: 10, Priority: 1
```
## Benchmarking
Running `pdm install` (or `maturin develop`) to install the Rust wheel followed by `python benchmark_1m.py`:
1.1 GHz CPU: (0.18+0.51)s
```
Enqueue time for 1 million items: 0.1798386573791504 seconds
Dequeue time for 1 million items: 0.5103330612182617 seconds
```
3.7 GHz CPU: (0.08+0.19)s
```
Enqueue time for 1 million items: 0.08250904083251953 seconds
Dequeue time for 1 million items: 0.1858220100402832 seconds
```
Raw data
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"description": "# prqrs\n\n> Python priority queue in Rust via pyo3\n\n<!-- [](https://pypi.org/project/prqrs) -->\n<!-- [](https://results.pre-commit.ci/latest/github/lmmx/prqrs/master) -->\n<!-- [](https://pypi.org/project/prqrs) -->\n[](https://pdm.fming.dev)\n[](https://github.com/lmmx/prqrs/blob/main/LICENSE)\n\nThe `prqrs` package provides a simple interface to a priority queue implemented in Rust. This\nguide will show you how to create a priority queue, add items to it, and retrieve items based on\ntheir priority.\n\n## Installation\n\n<!-- First, ensure that the prqrs package is installed.\n\n```sh\npip install prqrs\n```\n\n-->\n\nTo build the Rust project from source run:\n\n```sh\nmaturin develop --release\n```\n\nAlternatively using the PDM package manager, just run `pdm install`.\n\n## Usage\n\n### Creating a Priority Queue\n\nTo create a priority queue, import the `PriorityQueue` class from the `prqrs` package and\ninstantiate it:\n\n```py\nfrom prqrs import PriorityQueue\n\npq = PriorityQueue()\n```\n\n### Creating Items\n\nItems that can be added to the priority queue need a value and a priority.\nImport the `Item` class and create items:\n\n```py\nfrom prqrs import Item\n\nitem1 = Item(value=5, priority=3) # An item with value 5 and priority 3\nitem2 = Item(value=10, priority=1) # An item with value 10 and priority 1\n```\n\n### Adding Items to the Queue\n\nAdd items to the queue using the push method:\n\n```py\npq.push(item1)\npq.push(item2)\n```\n\n### Retrieving Items from the Queue\n\nRetrieve items based on their priority using the `pop` method.\nThis method returns the item with the highest priority (lowest numerical value of priority):\n\n```py\nhighest_priority_item = pq.pop()\nif highest_priority_item is not None:\n print(f\"Value: {highest_priority_item.value}, Priority: {highest_priority_item.priority}\")\n```\n\n### Checking if the Queue is Empty\n\nTo check whether the priority queue is empty, use the `is_empty` method:\n\n```py\nif pq.is_empty():\n print(\"The priority queue is empty.\")\nelse:\n print(\"The priority queue is not empty.\")\n```\n\n### Example\n\nHere is a complete example that demonstrates creating a priority queue, adding items, and retrieving\nthem:\n\n```py\nfrom prqrs import PriorityQueue, Item\n\n# Create a priority queue\npq = PriorityQueue()\n\n# Add items\npq.push(Item(value=5, priority=3))\npq.push(Item(value=10, priority=1))\npq.push(Item(value=7, priority=2))\n\n# Retrieve and print items\nwhile not pq.is_empty():\n item = pq.pop()\n print(f\"Value: {item.value}, Priority: {item.priority}\")\n```\n\nThis will output\n\n```\nValue: 5, Priority: 3\nValue: 7, Priority: 2\nValue: 10, Priority: 1\n```\n\n## Benchmarking\n\nRunning `pdm install` (or `maturin develop`) to install the Rust wheel followed by `python benchmark_1m.py`:\n\n1.1 GHz CPU: (0.18+0.51)s\n\n```\nEnqueue time for 1 million items: 0.1798386573791504 seconds\nDequeue time for 1 million items: 0.5103330612182617 seconds\n```\n\n3.7 GHz CPU: (0.08+0.19)s\n\n```\nEnqueue time for 1 million items: 0.08250904083251953 seconds\nDequeue time for 1 million items: 0.1858220100402832 seconds\n```\n\n",
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