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Read and query HDT document with ease in Python

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Read and query HDT document with ease in Python

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Requirements

  • Python version 3.6.4 or higher
  • pip
  • gcc/clang with c++11 support
  • Python Development headers > You should have the Python.h header available on your system. > For example, for Python 3.6, install the python3.6-dev package on Debian/Ubuntu systems.

Then, install the pybind11 library

pip install pybind11

Installation

Installation in a virtualenv is strongly advised!

Manual installation

git clone https://github.com/Callidon/pyHDT
cd pyHDT/
./install.sh

Getting started

from hdt import HDTDocument

# Load an HDT file.
# Missing indexes are generated automatically, add False as the second argument to disable them
document = HDTDocument("test.hdt")

# Display some metadata about the HDT document itself
print("nb triples: %i" % document.total_triples)
print("nb subjects: %i" % document.nb_subjects)
print("nb predicates: %i" % document.nb_predicates)
print("nb objects: %i" % document.nb_objects)
print("nb shared subject-object: %i" % document.nb_shared)

# Fetch all triples that matches { ?s ?p ?o }
# Use empty strings ("") to indicates variables
triples, cardinality = document.search_triples("", "", "")

print("cardinality of { ?s ?p ?o }: %i" % cardinality)
for triple in triples:
  print(triple)

# Search also support limit and offset
triples, cardinality = document.search_triples("", "", "", limit=10, offset=100)
# etc ...

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Files for hdt, version 2.2.1
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