我希望脚本将所有输入参数保存到文本文件中,以便我可以使用该文件使用
fromfile_prefix_chars
重新运行脚本。这是为了方便重现并存储用于生成某些数据的参数。
我的实现非常脆弱且不完整。我确信有更好的方法,但还没有通过谷歌找到它。 ** 问:如何使用 b)干净简洁的代码捕获 a)所有参数?**
ArgParser
具有允许从文本文件读取参数的功能 (fromfile_prefix_chars
)。重新发明轮子来阅读,例如,似乎没有什么意义。一个 JSON 文件。虽然读取文本文件是 ArgParser
功能集的一部分,但写入该文件似乎不是。我正在寻找一种优雅的解决方案,将 arg: Namespace
和 parser: ArgumentParser
转换为可以使用 ArgumentParser
读取的文本文件
python script.py --count 7 --channel-stdev 17 /somepath
这应该会生成一个名为 args_out.txt
的文本文件,其内容为 --count
1
--channel-mean
4.5
--channel-stdev
3
/somepath
python script.py @args_out.txt
from pathlib import Path
import logging
import argparse
from argparse import Namespace, ArgumentParser
from typing import Optional, List, Tuple
def get_arg_parser() -> ArgumentParser:
parser = ArgumentParser(description='Test',
fromfile_prefix_chars='@')
parser.add_argument('--count', default=1, type=int,
help='Number of ')
parser.add_argument('--channel-mean', default=4.5, type=float,
help='Mean number ')
parser.add_argument('--channel-stdev', default=3, type=float,
help='Standard deviation ')
# Logging control
log_group = parser.add_mutually_exclusive_group()
log_group.add_argument('-v', '--debug', action='store_true', help='Enable debug mode')
log_group.add_argument('-q', '--quiet', action='store_true', help='Enable quiet mode')
# I/O control
parser.add_argument('input', nargs='+', help='Path to a single')
return parser
def parse_args(arg_list: Optional[List[str]] = None) -> Namespace:
parser = get_arg_parser()
return parser.parse_args(arg_list)
def convert_args_to_text(args: Namespace, parser: ArgumentParser) -> str:
""" Convert an argparse.Namespace object to a list of strings that can be written to a file and then
read as arguments again. """
required, optionals, optionals_store_true = get_arg_name_to_argument_dicts(parser)
text = ''
for k, v in vars(args).items():
k_dash = k.replace('_', '-')
if k_dash in optionals:
text = add_key_and_value(text, key=k_dash, value=v)
elif k_dash in optionals_store_true:
if v:
text = add_key_and_value(text, key=v, value=None)
elif k_dash in required:
text = add_key_and_value(text, key=None, value=v)
else:
logging.warning(f"skipping argument {k}")
return text
def get_arg_name_to_argument_dicts(parser: ArgumentParser) -> Tuple[dict, dict, dict]:
""" Here I try to extract the argument names and whether they are optional or required from the ArgParser
This is very brittle FIXME """
optionals = {}
optionals_store_true = {} # These are only added if they are true
required = {}
for optk, optv in parser._optionals._option_string_actions.items():
if not optk.startswith('--'):
# Skip short options
continue
if isinstance(optv, argparse._StoreAction):
optionals[optk.strip('--')] = optv
elif isinstance(optv, argparse._StoreTrueAction):
optionals_store_true[optk.strip('--')] = optv
for req_group_actions in parser._positionals._group_actions:
name = req_group_actions.dest
required[name] = req_group_actions
return required, optionals, optionals_store_true
def add_key_and_value(text: str, key: Optional[str], value: Optional[Tuple[str, List]]) -> str:
""" Add a argument key and value to a text block. """
if key is not None:
text += f"--{key}\n"
if value is None:
return text
if isinstance(value, list):
for vi in value:
text += f'{vi}\n'
else:
text += f'{value}\n'
return text
def main():
args = parse_args()
print(args)
text = convert_args_to_text(args, get_arg_parser())
with open('args_out.txt', 'w') as f:
f.write(text)
if __name__ == '__main__':
main()
谢谢您的帮助
我发现你的方法令人困惑。考虑:
import arg
import json
import argparse
import shlex
from pathlib import Path
def dump_args():
with Path("args_out.txt", "w") as f:
print(shlex.join(sys.argv[1:]), file=f)
parser = argparse.ArgumentParser....
...
dump_args()
然后您可以使用 shell 命令
xargs
重新运行脚本,该命令也会解析引号。
xargs ./script.py <args_out.txt
您还可以使用以下命令从 python 重新运行脚本:
with Path("args_out.txt") as f:
args = parser.parse_args(shlex.split(f.read()))