swh.loader.pypi.client: Improve client's error logging

swh/loader/pypi/client.py

@@ -93,7 +93,8 @@ class PyPiClient:
         """
         response = self.session.get(url, **self.params)
         if response.status_code != 200:
-            raise ValueError('Error during query request %s' % url)
+            raise ValueError("Fail to query '%s'. Reason: %s" % (
+                url, response.status_code))
 
         if self.do_cache:
             self._save_response(response)
@@ -121,9 +122,12 @@ class PyPiClient:
         filepath = os.path.join(path, release['filename'])
         logging.debug('Release local path: %s' % filepath)
 
-        r = self.session.get(release['url'], **self.params)
-        if not r.ok:
-            raise ValueError('Fail to retrieve release %s' % version)
+        url = release['url']
+        r = self.session.get(url, **self.params)
+        if r.status_code != 200:
+            raise ValueError("Fail to query '%s'. Reason: %s" % (
+                url, r.status_code))
+
 
         # checks
         _len = len(r.content)