diff --git a/examples/providers/factory.py b/examples/providers/factory.py
index b8889c20..17b1c9ec 100644
--- a/examples/providers/factory.py
+++ b/examples/providers/factory.py
@@ -1,6 +1,7 @@
 """`Factory` providers example."""
 
 import collections
+
 import dependency_injector.providers as providers
 
 
diff --git a/examples/providers/factory_delegation.py b/examples/providers/factory_delegation.py
index c5b3a6a1..d5c66aea 100644
--- a/examples/providers/factory_delegation.py
+++ b/examples/providers/factory_delegation.py
@@ -1,6 +1,7 @@
 """`Factory` providers delegation example."""
 
 import collections
+
 import dependency_injector.providers as providers
 
 
diff --git a/examples/providers/factory_init_injections.py b/examples/providers/factory_init_injections.py
index 3d385fab..2bdb0b24 100644
--- a/examples/providers/factory_init_injections.py
+++ b/examples/providers/factory_init_injections.py
@@ -1,6 +1,7 @@
 """`Factory` providers init injections example."""
 
 import collections
+
 import dependency_injector.providers as providers