How to Extract Method Parameter Names Using Introspection Techniques?

Introspection Techniques for Extracting Method Parameter Names

Given a function like:

def a_method(arg1, arg2):
    pass

Retrieve the parameter names as a tuple of strings, such as ("arg1", "arg2").

Inspecting Code Objects

Utilize the inspect module for code object introspection:

<code class="python">>>> inspect.getfullargspec(a_method)
(['arg1', 'arg2'], None, None, None)</code>

This returns the argument list, a tuple of default values, a dictionary of keyword arguments, and the number of keyword-only arguments.

Inspecting Callables

The following example showcases introspection for callables with variable arguments:

<code class="python">>>> def foo(a, b, c=4, *arglist, **keywords): pass
>>> inspect.getfullargspec(foo)
(['a', 'b', 'c'], 'arglist', 'keywords', (4,))</code>

Note: Certain built-in functions defined in C cannot be introspected, resulting in a ValueError when using inspect.getfullargspec().

Python 3.3 and Above

For Python versions 3.3 and up, inspect.signature() provides a more comprehensive view of callable signatures:

<code class="python">>>> inspect.signature(foo)
<Signature (a, b, c=4, *arglist, **keywords)></code>

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