address UTF-8 error on windows

nornir/plugins/inventory/simple.py

@@ -70,6 +70,7 @@ def __init__(
         host_file: str = "hosts.yaml",
         group_file: str = "groups.yaml",
         defaults_file: str = "defaults.yaml",
+        encoding: str = "utf-8",
     ) -> None:
         """
         SimpleInventory is an inventory plugin that loads data from YAML files.
@@ -82,32 +83,34 @@ def __init__(
                 it doesn't exist it will be skipped
           defaults_file: path to file with defaults definition.
                 If it doesn't exist it will be skipped
+          encoding: Encoding used to save inventory files. Defaults to utf-8
         """
 
         self.host_file = pathlib.Path(host_file).expanduser()
         self.group_file = pathlib.Path(group_file).expanduser()
         self.defaults_file = pathlib.Path(defaults_file).expanduser()
+        self.encoding = encoding
 
     def load(self) -> Inventory:
         yml = ruamel.yaml.YAML(typ="safe")
 
         if self.defaults_file.exists():
-            with open(self.defaults_file, "r") as f:
+            with open(self.defaults_file, "r", encoding=self.encoding) as f:
                 defaults_dict = yml.load(f) or {}
             defaults = _get_defaults(defaults_dict)
         else:
             defaults = Defaults()
 
         hosts = Hosts()
-        with open(self.host_file, "r") as f:
+        with open(self.host_file, "r", encoding=self.encoding) as f:
             hosts_dict = yml.load(f)
 
         for n, h in hosts_dict.items():
             hosts[n] = _get_inventory_element(Host, h, n, defaults)
 
         groups = Groups()
         if self.group_file.exists():
-            with open(self.group_file, "r") as f:
+            with open(self.group_file, "r", encoding=self.encoding) as f:
                 groups_dict = yml.load(f) or {}
 
             for n, g in groups_dict.items():

tests/plugins/inventory/data/hosts.yaml

@@ -116,6 +116,7 @@ dev5.no_group:
     username:
     password:
     platform: linux
-    data: {}
+    data:
+        smiley: 😜
     groups: []
     connection_options: {}

tests/plugins/inventory/test_simple_inventory.py

@@ -220,7 +220,7 @@ def test(self):
                 },
                 "dev5.no_group": {
                     "connection_options": {},
-                    "data": {},
+                    "data": {"smiley": "😜"},
                     "groups": [],
                     "hostname": "localhost",
                     "name": "dev5.no_group",