How to Retrieve Parameter Names in Python Functions?

Retrieving Parameter Names within a Python Function

Inside a Python function, one may encounter the need to access a list of parameter names. While the inspect module commonly comes to mind, there exists a simpler solution using the code attribute:

<code class="python">def func(a, b, c):
    print(func.__code__.co_varnames)</code>

This concise method extracts the parameter names as they appear in the function definition. Alternatively, for functions with default arguments, the defaults attribute provides a tuple of the default values:

<code class="python">def func2(x, y=3):
    print(func2.__code__.co_varnames)
    print(func2.__defaults__)</code>

This approach is particularly useful when dynamic parameter introspection is required, enabling functions to self-discover their parameters at runtime.

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