How to use SPARQL to query local ttl file? - sparql

Question

I'm learning how to query ttl file that I retrieve from Wikipedia.
However, I stuck on getting the correct query to show the result that I seek for an answer.
Here is the example ttl file that I used.
# File name : WikipediaGraph.ttl
#prefix ns1: <http://www.example.com/> .
<http://en.wikipedia.org/wiki/Abilene,_Texas> ns1:2010population "117063" ;
ns1:2019population "123420" ;
ns1:areaSqKm "276.4" ;
ns1:areaSqMile "106.7" ;
ns1:popChange "5.43" ;
ns1:popPerSqKm "442" ;
ns1:popPerSqMile "1146" ;
ns1:state <http://en.wikipedia.org/wiki/Texas> .
The sample question that I want to get an answer to listed below.
Which state(s) has the most cities in the list? *
Which state(s) has the most population in cities in the list? *
Which state(s) has seen its cities in the list grow the most? *
Therefore, I stuck from the beginning as I can't get the result from the simple query.
import rdflib
from rdflib import Graph, URIRef, Literal, Namespace, RDF
g=rdflib.Graph()
g.parse("WikipediaGraph.ttl", format='turtle')
results = g.query("""
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX ns1: <http://www.example.com/>
SELECT ?v
WHERE {
?v rdf:type ns1:state .
}
ORDER BY ?NAME
""")
print('Results!')
for row in results:
print(row)
Could you please advise how I should write to query the above question?