How to Retrieve a List of Methods in a Python Class?

Retrieving a List of Methods in a Python Class

Overview

Retrieving a list of methods in a Python class allows for flexible object manipulation based on available methods.

Solution

To obtain a list of methods in a class, utilize the inspect module's getmembers function:

<code class="python">import inspect

methods_list = inspect.getmembers(Class, predicate=inspect.ismethod)</code>

where Class represents the target class.

Python 2 vs. Python 3

Note that getmembers returns different results depending on the Python version:

Python 2: Returns a list of tuples: [(method_name, unbound_method_object), ...]

Python 3: Returns a list of method objects: [unbound_method_object, ...]

Parameters

The getmembers function can take the following parameters:

• predicate: A function to filter the members returned. Only members that pass the predicate are included in the result.
• instance: An instance of the class to inspect. If not provided, class methods are inspected.

Example

To list the methods of the OptionParser class from optparse:

<code class="python">from optparse import OptionParser
import inspect

print(inspect.getmembers(OptionParser, predicate=inspect.ismethod))</code>

Output:

[('__init__', <unbound method OptionParser.__init__>),
 ('add_option', <unbound method OptionParser.add_option>),
 ('add_option_group', <unbound method OptionParser.add_option_group>),
 ...]

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