Python functions for working with Binary Heap

## Project description

Python library which helps in forming Binary Heaps (Min, Max) using list data structure. This library provides the below Heap specific functions.

heap_sort

Sort the given list of elements using Heap Sort Algorithm

heapify

Convert list of elements to Heap data structure (MinHeap/MaxHeap)

Add single/list of elements to Heap

get_root_value

Returns root value of the Heap without removing the element Minimum value for Min Heap, Maximum value for Max Heap

extract_root

Extract root element from Heap and reform the Heap

search_value

Searches the value in heap and returns index. if same element is present multiple times, first occurring index is returned

delete_element_at_index

Remove the element at the specified index and reform the Heap

For example function invocations, plesae see the tutorial.

## Installation

install from pypi using pip:

$pip install binary_heap or easy_install: $ easy_install binary_heap

or install from source using:

$git clone https://github.com/rameshrvr/binary_heap.git$ cd binary_heap
$pip install . ## Tutorial 1. Heap Sort (Sort the list using heap sort algorithm) Rameshs-MBP:binary_heap ramesh_rv$ python3
Python 3.7.0 (v3.7.0:1bf9cc5093, Jun 26 2018, 23:26:24)
[Clang 6.0 (clang-600.0.57)] on darwin
>>>
>>> from binary_heap import heap_sort
>>>
>>> data = [4, 1, 3, 2, 16, 9, 10, 14, 8, 7]
>>>
>>> heap_sort(data)  # Returns sorted list in ascending order
[1, 2, 3, 4, 7, 8, 9, 10, 14, 16]
>>>
>>> heap_sort(data, reverse=True)  # Returns sorted list in decsnding order
[16, 14, 10, 9, 8, 7, 4, 3, 2, 1]
>>>
1. Min Heap (Heap where the data in parent node is lesser than the data in child node)

Rameshs-MBP:binary_heap rameshrv$python3 Python 3.7.2 (default, Dec 27 2018, 07:35:06) [Clang 10.0.0 (clang-1000.11.45.5)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> >>> from binary_heap import MinHeap >>> >>> min_heap = MinHeap([4, 3, 6, 8, 11]) # Create an object for Min Heap >>> >>> min_heap.length() # Returns size of the heap 5 >>> min_heap.elements() [3, 4, 6, 8, 11] >>> >>> min_heap.add_element(1) # Add a single element to Heap >>> >>> min_heap.elements() [1, 4, 3, 8, 11, 6] >>> >>> min_heap.add_element([1, 14, 7, 5]) # Add list of elements to Heap >>> >>> min_heap.elements() [1, 4, 1, 7, 5, 6, 3, 14, 8, 11] >>> >>> min_heap.extract_root() # Extract root element from Heap and retrun it. In this case its the minimum element 1 >>> >>> min_heap.elements() [1, 4, 3, 7, 5, 6, 11, 14, 8] >>> >>> min_heap.get_root_value() # Returns the root value (minimum value) without removing it from Heap 1 >>> >>> min_heap.search_value(value=5) # Returns index of the searched value. -1 if there is no such value in Heap 4 >>> min_heap.search_value(value=7) 3 >>> min_heap.search_value(value=16) -1 >>> >>> min_heap.delete_element_at_index(3) # Remove the element at the specified index >>> >>> min_heap.elements() [1, 4, 3, 8, 5, 6, 11, 14] >>> 1. Max Heap (Heap where the data in parent node is greater than the data in child node) Rameshs-MBP:binary_heap rameshrv$ python3
Python 3.7.2 (default, Dec 27 2018, 07:35:06)
[Clang 10.0.0 (clang-1000.11.45.5)] on darwin
>>>
>>> from binary_heap import MaxHeap
>>>
>>> max_heap = MaxHeap([4, 3, 6, 8, 11])  # Create an object for Max Heap
>>>
>>> max_heap.elements()  # Returns size of the heap
[11, 8, 6, 4, 3]
>>>
>>>
>>> max_heap.elements()
[13, 8, 11, 4, 3, 6]
>>>
>>> max_heap.add_element([1, 14, 7, 5])  # Add list of elements to Heap
>>>
>>> max_heap.elements()
[14, 13, 11, 8, 5, 6, 1, 4, 7, 3]
>>>
>>> max_heap.extract_root()  # Extract root element from Heap and retrun it. In this case its the maximum element
14
>>>
>>> max_heap.elements()
[13, 8, 11, 7, 5, 6, 1, 4, 3]
>>>
>>> max_heap.get_root_value()  # Returns the root value (maximum value) without removing it from Heap
13
>>>
>>> max_heap.search_value(value=11)  # Returns index of the searched value. -1 if there is no such value in Heap
2
>>> max_heap.search_value(value=1)
6
>>> max_heap.search_value(value=14)
-1
>>>
>>> max_heap.delete_element_at_index(3)  # Remove the element at the specified index
>>>
>>> max_heap.elements()
[13, 8, 11, 4, 5, 6, 1, 3]

## Development

After checking out the repo, cd to the repository. Then, run pip install . to install the package locally. You can also run python (or) python3 for an interactive prompt that will allow you to experiment.

To install this package onto your local machine, cd to the repository then run pip install .. To release a new version, update the version number in setup.py, and then run python setup.py register, which will create a git tag for the version, push git commits and tags, and push the package file to [PyPI](https://pypi.org).

## Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/rameshrvr/binary_heap. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [Contributor Covenant](http://contributor-covenant.org) code of conduct.

The package is available as open source under the terms of the [GPL-3.0 License](https://opensource.org/licenses/GPL-3.0).

## Code of Conduct

Everyone interacting in the Binary Heap project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the [code of conduct](https://github.com/rameshrvr/binary_heap/blob/master/CODE_OF_CONDUCT.md).

• GPL-3.0

authors:
• Ramesh RV

## Project details

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