Merge pull request #65 from webysther/patch-2

Author: dahlia

wikidata/client.py

@@ -100,7 +100,9 @@ def __init__(self,
                                           None] = None,
                  entity_type_guess: bool = True,
                  cache_policy: CachePolicy = NullCachePolicy(),
-                 repr_string: Optional[str] = None) -> None:
+                 repr_string: Optional[str] = None,
+                 user_agent: Optional[str] = 'WikidataClientPython (https://github.com/dahlia/wikidata; hong@minhee.org)'
+        ) -> None:
         self._using_default_opener = opener is None
         if self._using_default_opener:
             if urllib.request._opener is None:  # type: ignore
@@ -122,6 +124,7 @@ def __init__(self,
         self.identity_map = cast(MutableMapping[EntityId, Entity],
                                  weakref.WeakValueDictionary())
         self.repr_string = repr_string
+        self.user_agent = user_agent
 
     def get(self, entity_id: EntityId, load: bool = False) -> Entity:
         """Get a Wikidata entity by its :class:`~.entity.EntityId`.
@@ -198,6 +201,10 @@ def request(self, path: str) -> Union[
         result = self.cache_policy.get(CacheKey(url))
         if result is None:
             logger.debug('%r: no cache; make a request...', url)
+            self.opener.addheaders = [(
+                'User-Agent', 
+                self.user_agent
+            )]
             try:
                 response = self.opener.open(url)
             except urllib.error.HTTPError as e: