# Lightweight RDF Stream Parser for Python
A lightweight RDF and RDF-Star parser which streams triples directly from disk
or standard input without loading the entire graph into memory.
Supports the N-Triples and N-Quads serialization format.
## Usage
Read and write to disk.
```python
from rdf import NTriples
from rdf import Literal
with NTriples(path = "./pizzacats.nt", mode = 'r') as g:
with NTriples(path = "./out.nt", mode = 'w') as h:
for subject, predicate, object in g.parse():
if type(object) is Literal and object.language == "en":
# do stuff
h.write((subject, predicate, object))
```
Read / write from standard input / output.
```python
from os import stdin
from rdf import NQuads
from rdf import IRIRef
g = NQuads(data=stdin.read(), mode = 'r')
h = NQuads(mode = 'w')
target = IRIRef("https://example.org/Pizzacat")
for triple in g.parse():
if triple[0] == target: # subject
# do stuff
h.write(triple)
g.close()
h.close()
```
Adding new triples.
```python
from rdf import IRIRef, Literal, Statement
from rdf import RDF, XSD
EX = IRIRef("https://example.org/") # define prefix
g = set()
subject = EX + "Pizzacat"
g.add(Statement(subject, RDF+"type", EX+"Cat"))
literal = Literal("Samurai Pizza Cats!!!", datatype=XSD+"string")
g.add(Statement(subject, EX+"tag_phrase", literal))
```
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"description": "# Lightweight RDF Stream Parser for Python\n\nA lightweight RDF and RDF-Star parser which streams triples directly from disk\nor standard input without loading the entire graph into memory.\n\nSupports the N-Triples and N-Quads serialization format.\n\n## Usage\n\nRead and write to disk.\n\n```python\nfrom rdf import NTriples\nfrom rdf import Literal\n\nwith NTriples(path = \"./pizzacats.nt\", mode = 'r') as g:\n with NTriples(path = \"./out.nt\", mode = 'w') as h:\n for subject, predicate, object in g.parse():\n if type(object) is Literal and object.language == \"en\":\n # do stuff\n h.write((subject, predicate, object))\n```\n\nRead / write from standard input / output.\n\n```python\nfrom os import stdin\nfrom rdf import NQuads\nfrom rdf import IRIRef\n\ng = NQuads(data=stdin.read(), mode = 'r')\nh = NQuads(mode = 'w')\n\ntarget = IRIRef(\"https://example.org/Pizzacat\")\nfor triple in g.parse():\n if triple[0] == target: # subject\n # do stuff\n h.write(triple)\n \ng.close()\nh.close()\n```\n\nAdding new triples.\n\n```python\nfrom rdf import IRIRef, Literal, Statement\nfrom rdf import RDF, XSD\n\nEX = IRIRef(\"https://example.org/\") # define prefix\ng = set()\n\nsubject = EX + \"Pizzacat\"\ng.add(Statement(subject, RDF+\"type\", EX+\"Cat\"))\n\nliteral = Literal(\"Samurai Pizza Cats!!!\", datatype=XSD+\"string\")\ng.add(Statement(subject, EX+\"tag_phrase\", literal))\n```\n",
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