inspect.getargspec ()

Get the names and default values of a function’s arguments. A tuple of four things is returned: (args, varargs, varkw, defaults). args is a list of the argument names (it may contain nested lists). varargs and varkw are the names of the * and ** arguments or None. defaults is a tuple of default argument values or None if there are no default arguments; if this tuple has n elements, they correspond to the last n elements listed in args. Changed in version 2.6: Returns a named tuple ArgSpec(args, varargs, keywords, defaults).

看到can-you-list-the-keyword-arguments-a-python-function-receives。

Dimitris Fasarakis Hilliard的公认答案建议以字符串格式获取参数，但我认为在解析这个字符串时可能会犯错误，因此我直接使用inspect模块创建了一个参数列表

import inspect
def my_function(a,b,c):
    #some code
    pass

result=list(inspect.signature(my_function).parameters.keys())
print(result)
['a','b','c']

你可以通过(将"function"替换为你的函数名)获得参数的数量:

function.__code__.co_argcount ## 2

参数的名称为:

function.__code__.co_varnames ## ('a', 'b')

这是获取函数的强制参数数量的解决方案(*)

如果使用了一些不常见的参数规范(具有默认值的仅限位置参数，没有默认值的仅限关键字参数，等等)，那么本文提出的许多解决方案都无法实现这一目的。

from typing import Callable, Any
import inspect

def get_mandatory_argcount(f: Callable[..., Any]) -> int:
    """Get the number of mandatory arguments of a function."""
    sig = inspect.signature(f)
    
    def parameter_is_mandatory(p: inspect.Parameter) -> bool:
        return p.default is inspect.Parameter.empty and p.kind not in (
            inspect.Parameter.VAR_POSITIONAL,
            inspect.Parameter.VAR_KEYWORD,
        )
    
    return sum(parameter_is_mandatory(p) for p in sig.parameters.values())

# mandatory keyword-only
def f1(b=2, *args, c, d=1, **kwds): pass
print(get_mandatory_argcount(f1))

# positional only with default
def f2(a=1, /, b=3, *args, **kwargs): pass
print(get_mandatory_argcount(f2))

(*)我想把这个作为一个答案，以编程方式确定一个函数所需的参数数量- Python代替，但由于某种原因，这个问题被标记为重复的这个问题，尽管它专门询问所需参数的数量，而这个问题只询问参数的一般数量。

import inspect
inspect.getargspec(someMethod)

查看inspect模块

inspect.getargspec ()

Get the names and default values of a function’s arguments. A tuple of four things is returned: (args, varargs, varkw, defaults). args is a list of the argument names (it may contain nested lists). varargs and varkw are the names of the * and ** arguments or None. defaults is a tuple of default argument values or None if there are no default arguments; if this tuple has n elements, they correspond to the last n elements listed in args. Changed in version 2.6: Returns a named tuple ArgSpec(args, varargs, keywords, defaults).

看到can-you-list-the-keyword-arguments-a-python-function-receives。