How to determine if a module name is part of python standard library

Quick 'n dirty solution, using the standard module imp:

import imp
import os.path
import sys

python_path = os.path.dirname(sys.executable)

my_mod_name = 'logging'

module_path = imp.find_module(my_mod_name)[1]
if 'site-packages' in module_path or python_path in module_path or not imp.is_builtin(my_mod_name):
    print('module', my_mod_name, 'is not included in standard python library')

EDIT:

I used the solution which is here.

import distutils.sysconfig as sysconfig
import os

def std_modules():
    ret_list = []
    std_lib = sysconfig.get_python_lib(standard_lib=True)
    for top, dirs, files in os.walk(std_lib):
        for nm in files:
            if nm != '__init__.py' and nm[-3:] == '.py':
                ret_list.append(os.path.join(top, nm)[len(std_lib)+1:-3].replace('\\','.'))
    return ret_list

l = std_modules()
print("logging" in l)
print("os" in l)

Output:

False
True

This works in both Python 2 and Python 3.

BEFORE EDIT:

I guess, you can use Python Docs. Here are standard library parts of Python 2 Docs and Python 3 Docs. Also, you can select the exact version of Python.

None of the solutions above were what I wanted, so I did it yet another way. Posting here in case it's useful to anyone.

import os

def standard_lib_names_gen(include_underscored=False):
    standard_lib_dir = os.path.dirname(os.__file__)
    for filename in os.listdir(standard_lib_dir):
        if not include_underscored and filename.startswith('_'):
            continue
        filepath = os.path.join(standard_lib_dir, filename)
        name, ext = os.path.splitext(filename)
        if filename.endswith('.py') and os.path.isfile(filepath):
            if str.isidentifier(name):
                yield name
        elif os.path.isdir(filepath) and '__init__.py' in os.listdir(filepath):
            yield name

>>> standard_lib_names = set(standard_lib_names_gen(include_underscored=True))
>>> # verify that a few known libs are there (including three folders and three py files)
>>> assert {'collections', 'asyncio', 'os', 'dis', '__future__'}.issubset(standard_lib_names)
>>> # verify that other decoys are not in there
>>> assert {'__pycache__', 'LICENSE.txt', 'config-3.8-darwin', '.DS_Store'}.isdisjoint(standard_lib_names)
>>>
>>> len(standard_lib_names)
200
>>>
>>> # not including underscored
>>> standard_lib_names = set(standard_lib_names_gen(include_underscored=False))
>>> len(standard_lib_names)
184