remove all package imports for better perf

Signed-off-by: Zhiyuan Chen <[email protected]>

README.cn.md

@@ -43,7 +43,7 @@ CHANfiG 有着强大的前向兼容能力，能够良好的兼容以往基于yam
 如果你此前使用yacs，只需简单将`CfgNode`替换为`Config`便可以享受所有CHANfiG所提供的便利。
 
 ```python
-from chanfig import Config
+from chanfig import Config, Variable
 
 
 class Model:

README.md

@@ -47,7 +47,7 @@ No matter your old config is json or yaml, you could directly read from them.
 And if you are using yacs, just replace `CfgNode` with `Config` and enjoy all the additional benefits that CHANfiG provides.
 
 ```python
-from chanfig import Config
+from chanfig import Config, Variable
 
 
 class Model:
@@ -87,7 +87,7 @@ if __name__ == '__main__':
     config = config.parse()
     # config.update('dataset.yaml')  # in case you want to merge a yaml
     # config.update('dataset.json')  # in case you want to merge a json
-    # note that the value of merge will surpass current values
+    # note that the value of merge will override current values
     config.model.decoder.num_layers = 8
     config.freeze()
     print(config)

chanfig/config.py

@@ -1,6 +1,5 @@
 from __future__ import annotations
 
-import sys
 from argparse import ArgumentParser
 from ast import literal_eval
 from collections import OrderedDict as OrderedDict_
@@ -13,6 +12,7 @@
 from json import loads as json_loads
 from os import PathLike
 from os.path import splitext
+from sys import argv
 from typing import IO, Any, Callable, Iterable, List, Optional, Sequence, Union
 from warnings import warn
 
@@ -89,7 +89,7 @@ def parse(
         """
 
         if args is None:
-            args = sys.argv[1:]
+            args = argv[1:]
         for arg in args:
             if arg.startswith("--") and args != "--":
                 arg = arg.split("=")[0]

docs/index.cn.md

@@ -45,7 +45,7 @@ CHANfiG 有着强大的前向兼容能力，能够良好的兼容以往基于yam
 现有代码：
 
 ```python
-from chanfig import Config
+from chanfig import Config, Variable
 
 
 class Model:

docs/index.md

@@ -47,7 +47,7 @@ No matter your old config is json or yaml, you could directly read from them.
 And if you are using yacs, just replace `CfgNode` with `Config` and enjoy all the additional benefits that CHANfiG provides.
 
 ```python
-from chanfig import Config
+from chanfig import Config, Variable
 
 
 class Model:
@@ -87,7 +87,7 @@ if __name__ == '__main__':
     config = config.parse()
     # config.update('dataset.yaml')  # in case you want to merge a yaml
     # config.update('dataset.json')  # in case you want to merge a json
-    # note that the value of merge will surpass current values
+    # note that the value of merge will override current values
     config.model.decoder.num_layers = 8
     config.freeze()
     print(config)