byte-prefix-tree 0.2.0

Tries with byte sequences as keys for Python and Rust

Byte tries in Rust with Python bindings

Installation

Install from PyPI (only built for Python 3.10+ on Linux)

pip install byte-prefix-tree

Manual installation

Make sure you have Rust installed, then do the following:

git clone https://github.com/bastiscode/byte-trie.git
cd byte-trie
pip install maturin[patchelf]
maturin develop --release

Usage

Currently implemented tries:

• Patricia trie
• Adaptive radix trie

Key needs to be a bytes object, value can be anything. Make sure that the key never contains a null/zero byte, as it is used as a terminator internally. For utf8-encoded text this usually is the case, but for other types of data you might need to encode it in a way that ensures this.

from byte_trie import PatriciaTrie, AdaptiveRadixTrie

pt = PatriciaTrie()

# add key-value pairs
pt.insert(b"hello", 1)
pt.insert(b"world", 2)

# delete key
print(pt.delete(b"hello"))  # 1

# check for keys and prefixes
print(pt.contains(b"hello"))  # False
print(pt.contains(b"world"))  # True
print(pt.contains(b"wor"))  # False
print(pt.contains_prefix(b"hel"))  # False
print(pt.contains_prefix(b"wor"))  # True

# get values
print(pt.get(b"hello"))  # None
print(pt.get(b"world"))  # 2

# overwrite
print(pt.insert(b"world", 3))  # 2
print(pt.get(b"world"))  # 3

# continuations for prefix
print(pt.continuations(b"wo"))  # [(b'world', 3)]

# prefixes of some key, returns list of (prefix length, value) tuples
key = b"world cup"
prefix_matches = pt.prefix_matches(key)
print(prefix_matches)  # [(5, 3)]
print(
    [(key[:length].decode(), value) for length, value in prefix_matches]
)  # [('world', 3)]

# same for ART
art = AdaptiveRadixTrie()

art.insert(b"hello", 1)
art.insert(b"world", 2)

print(art.delete(b"hello"))  # 1

print(art.contains(b"hello"))  # False
print(art.contains(b"world"))  # True
print(art.contains(b"wor"))  # False
print(pt.contains_prefix(b"hel"))  # False
print(pt.contains_prefix(b"wor"))  # True

print(art.get(b"hello"))  # None
print(art.get(b"world"))  # 2

print(art.insert(b"world", 3))  # 2
print(art.get(b"world"))  # 3

print(art.continuations(b"wo"))  # [(b'world', 3)]

key = b"world cup"
prefix_matches = art.prefix_matches(key)
print(prefix_matches)  # [(5, 3)]
print(
    [(key[:length].decode(), value) for length, value in prefix_matches]
)  # [('world', 3)]