pep8 again

csst_cpic_sim/io.py

@@ -117,7 +117,7 @@ def check_and_update_fits_header(header):
             header[keyword] = (header[keyword], dm_comment[keyword])
 
     if has_unexpected_keywords and has_all_keywords:  # if there is no other keywords, then use the default header model
-        for header_key, model_key in zip(header.keys(),dm_comment.keys()):
+        for header_key, model_key in zip(header.keys(), dm_comment.keys()):
             if header_key != model_key:
                 print_warning(
                     f"Keyword {header_key} not correspond to {model_key}")