Handle status code 403

pyiricdata/Client.py

@@ -125,6 +125,13 @@ class Client:
                 'Please double-check your identification information.'
             )
 
+        elif r.status_code == 403:
+            sys.stderr.write(
+                '[Permission denied] ' +
+                'The user does not have access permissions.\n'
+            )
+            return None
+
         elif r.status_code == 404:
             sys.stderr.write(
                 '[Not found] ' +