diff --git a/speasy/common/variable.py b/speasy/common/variable.py
index 6927c3ee..94a933cf 100644
--- a/speasy/common/variable.py
+++ b/speasy/common/variable.py
@@ -1,2 +1,2 @@
 # For backward compatibility only, cached variables with previous version need this to be loaded
-from ..products import SpeasyVariable
+from ..products import SpeasyVariable  # lgtm [py/unused-import]
diff --git a/speasy/inventory/data_tree.py b/speasy/inventory/data_tree.py
index 940eda23..a79e36a6 100644
--- a/speasy/inventory/data_tree.py
+++ b/speasy/inventory/data_tree.py
@@ -18,4 +18,5 @@ def empty_ssc_inventory():
 
 
 def reset_amda_inventory():
+    global amda
     amda = empty_amda_inventory()
diff --git a/speasy/inventory/indexes.py b/speasy/inventory/indexes.py
index cfb07651..e444ce28 100644
--- a/speasy/inventory/indexes.py
+++ b/speasy/inventory/indexes.py
@@ -1,4 +1,4 @@
-from typing import Optional, Any
+from typing import Optional
 
 
 class SpeasyIndex:
diff --git a/speasy/webservices/amda/indexes.py b/speasy/webservices/amda/indexes.py
index e113f021..2e6c90af 100644
--- a/speasy/webservices/amda/indexes.py
+++ b/speasy/webservices/amda/indexes.py
@@ -24,7 +24,7 @@ def dl_kw_args(self):
         return {'xmlid': self.xmlid}
 
 
-class AMDATimetableIndex(AMDAIndex, TimetableIndex):
+class AMDATimetableIndex(AMDAIndex, TimetableIndex):  # lgtm [py/conflicting-attributes]
     def __init__(self, meta: Dict, is_public=True):
         xmlid = meta.pop('xmlid')
         name = meta.pop('name')
@@ -33,7 +33,7 @@ def __init__(self, meta: Dict, is_public=True):
         flat_inventories.amda.timetables[xmlid] = self
 
 
-class AMDACatalogIndex(AMDAIndex, CatalogIndex):
+class AMDACatalogIndex(AMDAIndex, CatalogIndex):  # lgtm [py/conflicting-attributes]
     def __init__(self, meta: Dict, is_public=True):
         xmlid = meta.pop('xmlid')
         name = meta.pop('name')
@@ -42,7 +42,7 @@ def __init__(self, meta: Dict, is_public=True):
         flat_inventories.amda.catalogs[self.xmlid] = self
 
 
-class AMDAComponentIndex(AMDAIndex, ComponentIndex):
+class AMDAComponentIndex(AMDAIndex, ComponentIndex):  # lgtm [py/conflicting-attributes]
     def __init__(self, meta: Dict, is_public=True):
         xmlid = meta.pop('xmlid')
         name = meta.pop('name')
@@ -51,7 +51,7 @@ def __init__(self, meta: Dict, is_public=True):
         flat_inventories.amda.components[xmlid] = self
 
 
-class AMDAParameterIndex(AMDAIndex, ParameterIndex):
+class AMDAParameterIndex(AMDAIndex, ParameterIndex):  # lgtm [py/conflicting-attributes]
     def __init__(self, meta: Dict, is_public=True):
         xmlid = meta.pop('xmlid')
         name = meta.pop('name')
@@ -73,7 +73,7 @@ def __contains__(self, item):
         return False
 
 
-class AMDADatasetIndex(AMDAIndex, DatasetIndex):
+class AMDADatasetIndex(AMDAIndex, DatasetIndex):  # lgtm [py/conflicting-attributes]
     parameters: SimpleNamespace
 
     def __init__(self, meta: Dict, is_public=True):
diff --git a/speasy/webservices/amda/inventory.py b/speasy/webservices/amda/inventory.py
index a22d3da5..9d3d6a0b 100644
--- a/speasy/webservices/amda/inventory.py
+++ b/speasy/webservices/amda/inventory.py
@@ -1,8 +1,6 @@
 """Base inventory tree management
 """
-from typing import Dict, Sequence
 from types import SimpleNamespace
-from ...core import listify
 from .indexes import AMDATimetableIndex, AMDAComponentIndex, AMDAParameterIndex, AMDADatasetIndex, AMDACatalogIndex
 import xml.etree.ElementTree as Et