diff --git a/kheops/plugin/backend/hier.py b/kheops/plugin/backend/hier.py
index c4103a4..89827c0 100644
--- a/kheops/plugin/backend/hier.py
+++ b/kheops/plugin/backend/hier.py
@@ -1,14 +1,16 @@
+"""Hierarchy backend plugin"""
+
+import copy
+import logging
 
 from kheops.plugin.common import PluginBackendClass
 from kheops.utils import path_assemble_hier
-from pprint import pprint
-import logging
-import copy
 
 log = logging.getLogger(__name__)
 
 
 class Plugin(PluginBackendClass):
+    """Hierarchy plugin"""
 
     _plugin_name = "hier"
     _schema_props_new = {
@@ -55,6 +57,7 @@ class Plugin(PluginBackendClass):
     }
 
     def process(self, backends: list, ctx: dict) -> (list, dict):
+        """Return results"""
 
         new_backends = []
 
@@ -80,12 +83,16 @@ class Plugin(PluginBackendClass):
                 hier_data = path_assemble_hier(hier_data, hier_sep)
 
             if not isinstance(hier_data, list):
-                log.debug(f"Hier module can't loop over non list data, got: {hier_data} for {cand}")
+                log.debug(
+                    "Hier module can't loop over non list data, got: %s for %s",
+                    hier_data,
+                    cand,
+                )
                 continue
 
             # Build result list
             ret1 = hier_data
-            log.debug (f"Hier plugin will loop over: {ret1}")
+            log.debug("Hier plugin will loop over: %s", ret1)
             ret2 = []
             for index, item in enumerate(ret1):
                 _cand = copy.deepcopy(cand)
diff --git a/kheops/plugin/backend/init.py b/kheops/plugin/backend/init.py
index eab2ee0..35e1048 100644
--- a/kheops/plugin/backend/init.py
+++ b/kheops/plugin/backend/init.py
@@ -1,13 +1,14 @@
-from kheops.plugin.common import PluginBackendClass
-from pprint import pprint
+"""Init backend plugin"""
+
+import copy
 import logging
+from kheops.plugin.common import PluginBackendClass
 
 log = logging.getLogger(__name__)
 
-import copy
-
 
 class Plugin(PluginBackendClass):
+    """Init backend plugin"""
 
     _plugin_name = "init"
     _schema_props_new = None
@@ -15,6 +16,7 @@ class Plugin(PluginBackendClass):
     default_engine = "jerakia"
 
     def process(self, backends: list, ctx: dict) -> (list, dict):
+        """Return the new backend list"""
 
         new_backends = []
         for index, item in enumerate(backends):
diff --git a/kheops/plugin/backend/loop.py b/kheops/plugin/backend/loop.py
index fa87975..b5518c6 100644
--- a/kheops/plugin/backend/loop.py
+++ b/kheops/plugin/backend/loop.py
@@ -1,16 +1,14 @@
-import copy
-from pathlib import Path
-from kheops.utils import render_template
-from kheops.plugin.common import PluginBackendClass
-from pprint import pprint
+"""Loop backend plugin"""
 
+import copy
 import logging
-import anyconfig
-import textwrap
+
+from kheops.plugin.common import PluginBackendClass
 
 log = logging.getLogger(__name__)
 
 class Plugin(PluginBackendClass):
+    """Loop backend plugin"""
 
     _plugin_name = "loop"
     _plugin_help = (
@@ -118,6 +116,7 @@ class Plugin(PluginBackendClass):
     }
 
     def process(self, backends: list, ctx: dict) -> (list, dict):
+        """Return results"""
 
         new_backends = []
         for cand in backends:
@@ -135,7 +134,11 @@ class Plugin(PluginBackendClass):
             if isinstance(loop_data, str):
                 loop_data = cand["_run"]["scope"].get(loop_data, None)
             if not isinstance(loop_data, list):
-                log.debug("Got an empty list for loop for var %s, skipping this entry: %s", cand, loop_data)
+                log.debug(
+                    "Got an empty list for loop for var %s, skipping this entry: %s",
+                    cand,
+                    loop_data,
+                )
                 continue
 
             # Build a new list
diff --git a/kheops/plugin/engine/jerakia.py b/kheops/plugin/engine/jerakia.py
index 08bf1c9..e6a52cb 100644
--- a/kheops/plugin/engine/jerakia.py
+++ b/kheops/plugin/engine/jerakia.py
@@ -1,15 +1,18 @@
-from pathlib import Path
-from kheops.utils import render_template, glob_files
-from kheops.plugin.common import PluginEngineClass, PluginFileGlob #, Candidate
-from pprint import pprint
+"""Jerakia Engine Code"""
 
 import logging
+from pathlib import Path
+
 import anyconfig
 
+from kheops.utils import render_template, glob_files
+from kheops.plugin.common import PluginEngineClass, PluginFileGlob  # , Candidate
+
+
 log = logging.getLogger(__name__)
 
 
-#class FileCandidate(Candidate):
+# class FileCandidate(Candidate):
 #    path = None
 #
 #    def _report_data(self):
@@ -50,14 +53,14 @@ class Plugin(PluginEngineClass, PluginFileGlob):
                 {
                     "type": "string",
                 },
-#                {
-#                    "type": "array",
-#                    "items": {
-#                        "type": "string",
-#                    },
-#                },
-            ]
-        }
+                #                {
+                #                    "type": "array",
+                #                    "items": {
+                #                        "type": "string",
+                #                    },
+                #                },
+            ],
+        },
     }
 
     def _init(self):
@@ -97,18 +100,19 @@ class Plugin(PluginEngineClass, PluginFileGlob):
 
         # Look for files (NOT BE HERE !!!)
         ret3 = []
-        for p in parsed:
-            globbed = glob_files(path_top / p, 'ansible.yaml')
+        for item in parsed:
+            globbed = glob_files(path_top / item, "ansible.yaml")
             ret3.extend(globbed)
-        log.debug(f"Matched globs: %s", ret3)
+        log.debug("Matched globs: %s", ret3)
 
         return ret3
 
     def process(self):
+        """return results"""
 
         # Detect path root and path prefix
-        path_root = self.app.run['path_root']
-        path_prefix = self.app.conf2['config']['tree']['prefix']
+        path_root = self.app.run["path_root"]
+        path_prefix = self.app.conf2["config"]["tree"]["prefix"]
 
         if path_prefix:
             path_prefix = Path(path_prefix)
@@ -119,9 +123,7 @@ class Plugin(PluginEngineClass, PluginFileGlob):
         else:
             path_top = path_root
 
-        path_top = path_top
-        log.debug (f"Path Top: {path_top}")
-
+        log.debug("Path Top: %s", path_top)
 
         scope = self.config["_run"]["scope"]
         key = self.config["_run"]["key"]
@@ -132,7 +134,7 @@ class Plugin(PluginEngineClass, PluginFileGlob):
 
         ret = []
         for index, path in enumerate(self._show_paths(path_top, scope)):
-            log.debug(f"Reading file: {path}")
+            log.debug("Reading file: %s", path)
             # Fetch data
             found = False
             raw_data = anyconfig.load(path, ac_parser="yaml")
@@ -156,6 +158,7 @@ class Plugin(PluginEngineClass, PluginFileGlob):
             # Build result object
             result = {}
             result["run"] = {
+                "index": index,
                 "path": path,
                 "rel_path": str(rel_path),
             }
@@ -166,4 +169,3 @@ class Plugin(PluginEngineClass, PluginFileGlob):
             ret.append(result)
 
         return ret
-
diff --git a/kheops/plugin/strategy/last.py b/kheops/plugin/strategy/last.py
index 49c6e74..6e3c3c4 100644
--- a/kheops/plugin/strategy/last.py
+++ b/kheops/plugin/strategy/last.py
@@ -1,14 +1,17 @@
+"""Simple last strategy"""
+
 import logging
 from kheops.plugin.common import PluginStrategyClass
 
 log = logging.getLogger(__name__)
 
-
 class Plugin(PluginStrategyClass):
+    """Last strategy plugin"""
 
     _plugin_name = "last"
     _schema_props_new = None
 
     def process(self, candidates: list, rule=None) -> (list, dict):
+        """Return results"""
 
         return candidates[-1]
diff --git a/kheops/plugin/strategy/schema.py b/kheops/plugin/strategy/schema.py
index 4c96175..3de24b0 100644
--- a/kheops/plugin/strategy/schema.py
+++ b/kheops/plugin/strategy/schema.py
@@ -1,16 +1,21 @@
-import logging
-from kheops.plugin.common import PluginStrategyClass
-from kheops.utils import schema_validate, str_ellipsis
-
-log = logging.getLogger(__name__)
+"""Schema strategy"""
 
 import json
+import logging
 from pprint import pprint
+
 from jsonmerge import Merger
 from prettytable import PrettyTable
 
+from kheops.plugin.common import PluginStrategyClass
+from kheops.utils import str_ellipsis
+
+
+log = logging.getLogger(__name__)
+
 
 class Plugin(PluginStrategyClass):
+    """Schema strategy plugin"""
 
     _plugin_name = "schema"
     _schema_props_new = {
@@ -88,6 +93,7 @@ class Plugin(PluginStrategyClass):
     }
 
     def process(self, candidates: list, rule=None) -> (list, dict):
+        """Return results"""
 
         trace = rule["trace"]
         explain = rule["explain"]