Fix setting example query

Author: white-gecko

sparql_file/__init__.py

@@ -6,11 +6,14 @@
 
 def sparql_file(
     graph_file: str,
-    example_query: str = DEFAULT_EXAMPLE_QUERY,
+    example_query: str | None = None,
     graph_format: str | None = None,
 ):
     g = Graph()
 
+    if example_query is None:
+        example_query = DEFAULT_EXAMPLE_QUERY
+
     with open(graph_file, "r") as graph_file_io:
         g.parse(source=graph_file_io, format=None)
 

sparql_file/env.py

@@ -3,8 +3,6 @@
 from . import sparql_file
 
 GRAPH_FILE = os.getenv("GRAPH_FILE")
-EXAMPLE_QUERY = os.getenv(
-    "EXAMPLE_QUERY",
-)
+EXAMPLE_QUERY = os.getenv("EXAMPLE_QUERY")
 
 app = sparql_file(GRAPH_FILE, EXAMPLE_QUERY)