Extracting Method Parameter Names with Python
In Python, determining the names of method parameters can be crucial for refactoring, debugging, or documenting code. Consider a function defined as:
<code class="python">def a_method(arg1, arg2): pass</code>
To obtain the names of the parameters as a tuple, there are several approaches:
Using the inspect Module
The inspect module provides an extensive set of functions for examining code objects. It supports extracting parameter names through inspect.getfullargspec():
<code class="python">import inspect inspect.getfullargspec(a_method) # Output: (['arg1', 'arg2'], None, None, None)</code>
This returns a tuple containing the names of the positional arguments (in this case, ('arg1', 'arg2')), as well as information about keywords, var-args, and default values (which are not relevant in this example).
Using inspect.signature()
Since Python 3.3, the inspect.signature() function provides a comprehensive view of a callable's signature:
<code class="python">inspect.signature(a_method) # Output: <signature b c="4,"></signature></code>
This reveals the signature with all parameter information, including default values and variable-length arguments.
Caveats
Some callables, particularly built-in functions in CPython, may not be introspectable. Attempting to inspect them may result in a ValueError.
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