How to Retrieve Parameter Names Inside a Python Function Without `inspect`?

Retrieving Parameter Names Within a Python Function

Accessing parameter names within a running Python function can be valuable for various purposes. While inspect module offers one approach, it's important to consider an alternative solution.

The co_argcount attribute of the function's code object provides the count of function parameters. Moreover, co_varnames attribute offers the names of formal parameters. This information is available regardless of whether the function has default values or not.

For instance:

<code class="python">def func(x, y):
    print(func.__code__.co_argcount)
    print(func.__code__.co_varnames)

func(3, 3)</code>

Output:

2
('x', 'y')

As demonstrated, this alternative method retrieves the parameter names without the need for inspect module. It relies solely on the function's code object, providing a straightforward and efficient solution for accessing parameter names dynamically.

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