import argparse

import inspect

from inspect import signature

def add_arguments_from_signature(parser, obj, prefix="", exclude=[]):

"""Add arguments to parser base on obj default keyword parameters.

:meta private:

Args:

parser (ArgumentParser)): the argument parser to which we want to add arguments.

obj (type): the class from which we want to extract default parameters for the constructor.

"""

sig = signature(obj)

prefix = f"{prefix}-" if len(prefix) > 0 else ""

added_arguments = []

for p_name, p in sig.parameters.items():

if not (p_name in exclude):

if p.kind == inspect._POSITIONAL_OR_KEYWORD:

arg_format = f"--{prefix}{p_name.replace('_', '-')}"

arg_kwargs = {"help": ""}

# check type int

if not (p.annotation is inspect._empty):

arg_kwargs["type"] = p.annotation

arg_kwargs["help"] += f"Type[{p.annotation.__name__}]. "

# check default value

if p.default is not inspect._empty:

arg_kwargs["default"] = p.default

arg_kwargs["help"] += f"Defaults to '{str(p.default)}'. "

else:

arg_kwargs["required"] = True

parser.add_argument(

arg_format,

**arg_kwargs,

)

added_arguments.append(p_name)

return added_arguments

def str2bool(v):

"""

:meta private:

"""

if isinstance(v, bool):

return v

if v.lower() in ("yes", "true", "t", "y", "1"):

return True

elif v.lower() in ("no", "false", "f", "n", "0"):

return False

else:

raise argparse.ArgumentTypeError("Boolean value expected.")