fix style issues

plugins/filter/phpipam.py

@@ -10,6 +10,7 @@
 
 
 class FilterModule(object):
+
     """Define useful filter in collection."""
 
     def filters(self):
@@ -19,25 +20,26 @@ def filters(self):
         :rtype: dict
         """
         return {
-            'is_subnet': self.is_subnet,
+            'is_subnet': is_subnet,
         }
 
-    def is_subnet(self, children, parent):
-        """Check if a subnet belongs to another.
 
-        First argument is a subnet  second another. If the first subnet belongs to second
+def is_subnet(children, parent):
+    """Check if a subnet belongs to another.
 
-        :param children: [description]
-        :type children: [type]
-        :param parent: [description]
-        :type parent: [type]
-        :return: [description]
-        :rtype: [type]
-        """
-        c = ipaddress.ip_network(children)
-        p = ipaddress.ip_network(parent)
+    First argument is a subnet  second another. If the first subnet belongs to second
+
+    :param children: [description]
+    :type children: [type]
+    :param parent: [description]
+    :type parent: [type]
+    :return: [description]
+    :rtype: [type]
+    """
+    c = ipaddress.ip_network(children)
+    p = ipaddress.ip_network(parent)
 
-        if not c.subnet_of(p) or c == p:
-            return False
-        else:
-            return c.subnet_of(p)
+    if not c.subnet_of(p) or c == p:
+        return False
+    else:
+        return c.subnet_of(p)