[algorithms][api] Fix key search in dictionary

beat/web/algorithms/api.py

@@ -177,7 +177,7 @@ def binary(request, author_name, object_name, version=None):
         if request.user.is_anonymous() or (request.user.username != author_name):
             return HttpResponseForbidden()
 
-        if not request.FILES.has_key('binary'):
+        if 'binary' not in request.FILES:
             return HttpResponseBadRequest()
 
         file = request.FILES['binary']