diff --git a/pymisp/api.py b/pymisp/api.py
index f12b668..0babf3c 100644
--- a/pymisp/api.py
+++ b/pymisp/api.py
@@ -566,7 +566,7 @@ class PyMISP(object):
     def prepare_attribute(self, event_id, distribution, to_ids, category, info,
                           analysis, threat_level_id):
         to_post = {'request': {}}
-        authorized_categs = ['Payload delivery', 'Artifacts dropped', 'Payload Installation', 'External Analysis','Antivirus detection']
+        authorized_categs = ['Payload delivery', 'Artifacts dropped', 'Payload Installation', 'External Analysis', 'Antivirus detection']
 
         if event_id is not None:
             try:
@@ -619,14 +619,14 @@ class PyMISP(object):
         return self._check_response(response)
 
     def upload_attachment(self, filename, filepath, event_id, distribution, to_ids,
-                      category, info, analysis, threat_level_id):
+                          category, info, analysis, threat_level_id):
         to_post = self.prepare_attribute(event_id, distribution, to_ids, category,
                                          info, analysis, threat_level_id)
         to_post['request']['files'] = [{'filename': filename, 'data': self._encode_file_to_upload(filepath)}]
         return self._upload_sample(to_post)
 
     def upload_attachmentlist(self, filepaths, event_id, distribution, to_ids, category,
-                          info, analysis, threat_level_id):
+                              info, analysis, threat_level_id):
         to_post = self.prepare_attribute(event_id, distribution, to_ids, category,
                                          info, analysis, threat_level_id)
         files = []
@@ -636,14 +636,13 @@ class PyMISP(object):
             files.append({'filename': os.path.basename(path), 'data': self._encode_file_to_upload(path)})
         to_post['request']['files'] = files
         return self._upload_sample(to_post)
-    
+
     def _upload_attachment(self, to_post):
         session = self.__prepare_session('json')
         url = urljoin(self.root_url, 'events/upload_attachment')
         response = session.post(url, data=json.dumps(to_post))
         return self._check_response(response)
 
-
     # ############################
     # ######## Proposals #########
     # ############################