Add black to CI/CD (#1)

Reviewed-on: https://git.deguo.duckdns.org/pavel/argclass/pulls/1
Co-authored-by: Pavel Lutskov <pavel.lutskov@gmail.com>
Co-committed-by: Pavel Lutskov <pavel.lutskov@gmail.com>

argclass.py

@@ -10,18 +10,18 @@ def make_gnu_option(name):
 def decide_default(field_):
     arg_cfg = {}
     if field_.default != MISSING:
-        arg_cfg['default'] = field_.default
+        arg_cfg["default"] = field_.default
     elif field_.default_factory != MISSING:
-        arg_cfg['default'] = field_.default_factory()
+        arg_cfg["default"] = field_.default_factory()
     else:
-        arg_cfg['required'] = True
+        arg_cfg["required"] = True
     return arg_cfg
 
 
 def get_choices(field_):
     arg_cfg = {}
     try:
-        arg_cfg['choices'] = field_.metadata['choices']
+        arg_cfg["choices"] = field_.metadata["choices"]
     except KeyError:
         pass
     return arg_cfg
@@ -38,16 +38,16 @@ def compute_arg_names(name, field_):
 
 def _prepare_bool(ap: ArgumentParser, name, field_):
     arg_cfg = decide_default(field_)
-    required = 'required' in arg_cfg
+    required = "required" in arg_cfg
     bool_parser = ap.add_mutually_exclusive_group(required=required)
-    bool_parser.add_argument(make_gnu_option(name),
-                             action='store_true',
-                             dest=name)
-    bool_parser.add_argument(make_gnu_option(f'no_{name}'),
-                             action='store_false',
-                             dest=name)
+    bool_parser.add_argument(
+        make_gnu_option(name), action="store_true", dest=name
+    )
+    bool_parser.add_argument(
+        make_gnu_option(f"no_{name}"), action="store_false", dest=name
+    )
     if not required:
-        ap.set_defaults(**{name: arg_cfg['default']})
+        ap.set_defaults(**{name: arg_cfg["default"]})
 
 
 def _prepare_list_cfg(name, field_):
@@ -57,14 +57,14 @@ def _prepare_list_cfg(name, field_):
     }
     subtype = typing.get_args(field_.type)
     if not subtype:
-        arg_cfg['type'] = str
+        arg_cfg["type"] = str
     else:
-        arg_cfg['type'] = subtype[0]
+        arg_cfg["type"] = subtype[0]
 
-    if field_.metadata.get('allow_empty', False):
-        arg_cfg['nargs'] = '*'
+    if field_.metadata.get("allow_empty", False):
+        arg_cfg["nargs"] = "*"
     else:
-        arg_cfg['nargs'] = '+'
+        arg_cfg["nargs"] = "+"
     return arg_cfg
 
 
@@ -73,7 +73,7 @@ def _prepare_trivial_cfg(name, field_):
         **decide_default(field_),
         **get_choices(field_),
     }
-    arg_cfg['type'] = field_.type
+    arg_cfg["type"] = field_.type
     return arg_cfg
 
 
@@ -99,7 +99,6 @@ def prepare_field(ap, name, field_):
 
 
 def argclass(cls):
-
     @classmethod
     def parse_args(cls, argv):
         ap = ArgumentParser()