sparql query materials

query_materials.py

@@ -0,0 +1,59 @@
+# import rdflib
+# g = rdflib.Graph()
+# https://stackoverflow.com/questions/68824808/query-wikidata-rest-api-with-related-identifier
+
+from urllib.request import urlopen
+from urllib.parse import urlencode
+import json
+import re
+
+
+def get_info (wdurl):
+    m = re.search(r"^https?:\/\/www\.wikidata\.org\/(wiki|entity)/(?P<q>Q\d+)$", wdurl)
+    if m is not None:
+        qid = m.groupdict()['q']
+        # print ("qid", qid)
+        url = f"https://www.wikidata.org/wiki/Special:EntityData/{qid}.json?flavor=simple"
+        return json.load(urlopen(url))['entities'][qid]
+    else:
+        print("unrecognized url")
+
+def query (q, format="json", endpoint="https://query.wikidata.org/sparql"):
+    p = {}
+    p['format'] = format
+    p['query'] = q
+    f = urlopen(endpoint+"?"+urlencode(p))
+    return json.load(f)['results']['bindings']
+
+
+q1 = """
+PREFIX p: <http://www.wikidata.org/prop/>
+PREFIX ps: <http://www.wikidata.org/prop/statement/>
+
+SELECT DISTINCT ?item ?statement0 ?material WHERE
+  {
+      ?item p:P186 ?statement0.
+      ?statement0 ps:P186 ?material.
+  }
+LIMIT 10
+"""
+
+
+print (q1)
+print ()
+from time import sleep
+
+for result in query(q1):
+    statement = result['statement0']['value']
+    value, item = result['material']['value'], result['item']['value']
+    value = get_info(value)
+    item = get_info(item)
+    # print ("value", value)
+    # print ("item", item)
+    try:
+        material_label, item_label = value['labels']['en']['value'], item['labels']['en']['value']
+        print (f"A {item_label} made of {material_label}. See {statement}")
+        print ()
+        sleep(3)
+    except KeyError:
+        print ("no english label?")