Rewrite get_data, unnecessary Python data processing

ib-clearance.py

@@ -49,16 +49,20 @@ def get_data(conn):
         id = int(input("\nPlease enter student ID: "))
 
         cur = conn.cursor()
-        cur.execute("SELECT id, student_class, other FROM students")
-        ids = cur.fetchall()  # ids is list of tuples.
+        cur.execute("""
+            SELECT id, student_class, other
+            FROM students
+            WHERE id = ?
+            """, (id,))
+        data = cur.fetchone()
 
-        for tup in ids:
-            if id == tup[0]:
-                lis = list(tup)
-                lis[2] = lis[2].split()
-                return lis
+        if data is not None:
+            data = list(data)  # SQLite returns tuples.
+            data[2] = data[2].split()
         else:
             raise ValueError
+
+        return data
     except ValueError:
         print("\nInvalid ID, try again.")
         return get_data(conn)