diff --git a/cfg_checker/modules/packages/repos.py b/cfg_checker/modules/packages/repos.py
index 334cbb5..025703e 100644
--- a/cfg_checker/modules/packages/repos.py
+++ b/cfg_checker/modules/packages/repos.py
@@ -821,29 +821,19 @@
             # <10symbols> \t <md5> \t sorted headers with no tag
             # ...
             # section
-            _ss = _p.keys()
-            _ss.sort()
-            for _s in _ss:
-                _apps = _p[_s].keys()
-                _apps.sort()
+            for _s in sorted(_p):
                 # app
-                for _a in _apps:
+                for _a in sorted(_p[_s]):
                     _o = ""
                     _mm = []
                     # get and sort tags
-                    _vs = _p[_s][_a].keys()
-                    _vs.sort()
-                    for _v in _vs:
+                    for _v in sorted(_p[_s][_a]):
                         _o += "\n" + " "*8 + _v + ':\n'
                         # get and sort tags
-                        _mds = _p[_s][_a][_v].keys()
-                        _mds.sort()
-                        for _md5 in _mds:
+                        for _md5 in sorted(_p[_s][_a][_v]):
                             _o += " "*16 + _md5 + "\n"
                             # get and sort repo headers
-                            _rr = _p[_s][_a][_v][_md5].keys()
-                            _rr.sort()
-                            for _r in _rr:
+                            for _r in sorted(_p[_s][_a][_v][_md5]):
                                 _o += " "*24 + _r.replace('_', ' ') + '\n'
                                 _m = _p[_s][_a][_v][_md5][_r]["maintainer"]
                                 if _m not in _mm: