release 0.5.0

Author: SunDoge

.travis.yml

@@ -5,6 +5,7 @@ python:
   - "3.6"
   - "3.7"
   - "3.8"
+  - "3.9"
 script:
   - pip install dataclasses
   - pytest

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "typed-args"
-version = "0.5.0.a3"
+version = "0.5.0"
 description = "Parse command line arguments by defining dataclasses"
 authors = ["SunDoge <384813529@qq.com>"]
 readme = "README.md"

typed_args/__init__.py

@@ -9,4 +9,4 @@
 
 from ._typed_args import TypedArgs, add_argument
 
-__version__ = "0.5.0.a3"
+__version__ = "0.5.0"

typed_args/_typed_args.py

@@ -9,10 +9,12 @@
 import dataclasses
 import inspect
 import logging
-from argparse import ArgumentParser, Namespace
+from argparse import Action, ArgumentParser, Namespace
+from collections.abc import Container
 from dataclasses import Field, dataclass, field
 from enum import Enum
-from typing import Dict, List, Optional, Sequence, Tuple, Type, TypeVar
+from typing import (Any, Callable, Dict, List, Optional, Sequence, Tuple, Type,
+                    TypeVar, Union)
 
 _logger = logging.getLogger(__name__)
 
@@ -129,18 +131,23 @@ def _assign(self, args: Namespace, prefix: str = ''):
 
 def add_argument(
     *flags: str,
-    action=None,
-    nargs=None,
-    const=None,
-    default=None,
-    type=None,
-    choices=None,
-    required=None,
-    help=None,
-    metavar=None,
+    action: Union[str, Type[Action]] = None,
+    nargs: Union[str, int] = None,
+    const: Any = None,
+    default: Any = None,
+    type: Callable[[str], Any] = None,
+    choices: Container = None,  # to support `is in`
+    required: bool = None,
+    help: str = None,
+    metavar: str = None,
 ) -> Field:
     kwargs = locals()
     args = kwargs.pop('flags')
+
+    # The parser.add_argument only accept args with value
+    # We use default value None to filter out the unused args
+    # add_argument(*args, **kwargs) 有复杂的规则
+    # 为了避免手动处理这些规则，采用过滤 None 的方式来过滤没有使用的参数
     kwargs = {k: v for k, v in kwargs.items() if v is not None}
     return _add_argument(*args, **kwargs)