How do I get a list of locally installed Python modules?

PythonModulePip

Python Problem Overview


How do I get a list of Python modules installed on my computer?

Python Solutions


Solution 1 - Python

help('modules')

in a Python shell/prompt.

Solution 2 - Python

Solution

Do not use with pip > 10.0!

My 50 cents for getting a pip freeze-like list from a Python script:

import pip
installed_packages = pip.get_installed_distributions()
installed_packages_list = sorted(["%s==%s" % (i.key, i.version)
     for i in installed_packages])
print(installed_packages_list)

As a (too long) one liner:

sorted(["%s==%s" % (i.key, i.version) for i in pip.get_installed_distributions()])

Giving:

['behave==1.2.4', 'enum34==1.0', 'flask==0.10.1', 'itsdangerous==0.24',  'jinja2==2.7.2', 'jsonschema==2.3.0', 'markupsafe==0.23', 'nose==1.3.3',  'parse-type==0.3.4', 'parse==1.6.4', 'prettytable==0.7.2', 'requests==2.3.0', 'six==1.6.1', 'vioozer-metadata==0.1', 'vioozer-users-server==0.1',  'werkzeug==0.9.4']

Scope

This solution applies to the system scope or to a virtual environment scope, and covers packages installed by setuptools, pip and (god forbid) easy_install.

My use case

I added the result of this call to my flask server, so when I call it with http://example.com/exampleServer/environment I get the list of packages installed on the server's virtualenv. It makes debugging a whole lot easier.

Caveats

I have noticed a strange behaviour of this technique - when the Python interpreter is invoked in the same directory as a setup.py file, it does not list the package installed by setup.py.

Steps to reproduce:
Create a virtual environment
$ cd /tmp
$ virtualenv test_env
New python executable in test_env/bin/python
Installing setuptools, pip...done.
$ source test_env/bin/activate
(test_env) $ 
Clone a git repo with setup.py
(test_env) $ git clone https://github.com/behave/behave.git
Cloning into 'behave'...
remote: Reusing existing pack: 4350, done.
remote: Total 4350 (delta 0), reused 0 (delta 0)
Receiving objects: 100% (4350/4350), 1.85 MiB | 418.00 KiB/s, done.
Resolving deltas: 100% (2388/2388), done.
Checking connectivity... done.

We have behave's setup.py in /tmp/behave:

(test_env) $ ls /tmp/behave/setup.py
/tmp/behave/setup.py
Install the python package from the git repo
(test_env) $ cd /tmp/behave && pip install . 
running install
...
Installed /private/tmp/test_env/lib/python2.7/site-packages/enum34-1.0-py2.7.egg
Finished processing dependencies for behave==1.2.5a1
If we run the aforementioned solution from /tmp
>>> import pip
>>> sorted(["%s==%s" % (i.key, i.version) for i in pip.get_installed_distributions()])
['behave==1.2.5a1', 'enum34==1.0', 'parse-type==0.3.4', 'parse==1.6.4', 'six==1.6.1']
>>> import os
>>> os.getcwd()
'/private/tmp'
If we run the aforementioned solution from /tmp/behave
>>> import pip
>>> sorted(["%s==%s" % (i.key, i.version) for i in pip.get_installed_distributions()])
['enum34==1.0', 'parse-type==0.3.4', 'parse==1.6.4', 'six==1.6.1']
>>> import os
>>> os.getcwd()
'/private/tmp/behave'

behave==1.2.5a1 is missing from the second example, because the working directory contains behave's setup.py file.

I could not find any reference to this issue in the documentation. Perhaps I shall open a bug for it.

Solution 3 - Python

Now, these methods I tried myself, and I got exactly what was advertised: All the modules.

Alas, really you don't care much about the stdlib, you know what you get with a python install.

Really, I want the stuff that I installed.

What actually, surprisingly, worked just fine was:

pip freeze

Which returned:

Fabric==0.9.3
apache-libcloud==0.4.0
bzr==2.3b4
distribute==0.6.14
docutils==0.7
greenlet==0.3.1
ipython==0.10.1
iterpipes==0.4
libxml2-python==2.6.21

I say "surprisingly" because the package install tool is the exact place one would expect to find this functionality, although not under the name 'freeze' but python packaging is so weird, that I am flabbergasted that this tool makes sense. Pip 0.8.2, Python 2.7.

Solution 4 - Python

Since pip version 1.3, you've got access to:

pip list

Which seems to be syntactic sugar for "pip freeze". It will list all of the modules particular to your installation or virtualenv, along with their version numbers. Unfortunately it does not display the current version number of any module, nor does it wash your dishes or shine your shoes.

Solution 5 - Python

  • In ipython you can type "import Tab".

  • In the standard Python interpreter, you can type "help('modules')".

  • At the command-line, you can use pydoc modules.

  • In a script, call pkgutil.iter_modules().

Solution 6 - Python

I just use this to see currently used modules:

import sys as s
s.modules.keys()

which shows all modules running on your python.

For all built-in modules use:

s.modules

Which is a dict containing all modules and import objects.

Solution 7 - Python

In normal shell just use

pydoc modules

Solution 8 - Python

As of pip 10, the accepted answer will no longer work. The development team has removed access to the get_installed_distributions routine. There is an alternate function in the setuptools for doing the same thing. Here is an alternate version that works with pip 10:

import pkg_resources
installed_packages = pkg_resources.working_set
installed_packages_list = sorted(["%s==%s" % (i.key, i.version)
     for i in installed_packages])
print(installed_packages_list)

Please let me know if it will or won't work in previous versions of pip, too.

Solution 9 - Python

If we need to list the installed packages in the Python shell, we can use the help command as follows

>>> help('modules package')

Solution 10 - Python

Works Regardless of Pip Version

Run the following in your python editor or IPython:

import pkg_resources
installed_packages = {d.project_name: d.version for d in pkg_resources.working_set}
print(installed_packages)

Read other answers and pulled together this combo, which is quickest and easiest inside Python.

Find the specific Packages

Conveniently you can then get items from your dict easily, i.e.

installed_packages['pandas'] >> '1.16.4'

Using Pip List Well

!pip list will run inside your jupyter notebook if working there, simplifying the 'quick check' Combine with other utilities like grep(if you have installed) pip list | grep pandas will get you your current pandas version for example

Solution 11 - Python

I normally use pip list to get a list of packages (with version).

This works in a virtual environment too, of course. To show what's installed in only the virtual environment (not global packages), use pip list --local.

Here's documentation showing all the available pip list options, with several good examples.

Solution 12 - Python

This will help

In terminal or IPython, type:

help('modules')

then

In [1]: import                      #import press-TAB
Display all 631 possibilities? (y or n)
ANSI                   audiodev               markupbase
AptUrl                 audioop                markupsafe
ArgImagePlugin         avahi                  marshal
BaseHTTPServer         axi                    math
Bastion                base64                 md5
BdfFontFile            bdb                    mhlib
BmpImagePlugin         binascii               mimetools
BufrStubImagePlugin    binhex                 mimetypes
CDDB                   bisect                 mimify
CDROM                  bonobo                 mmap
CGIHTTPServer          brlapi                 mmkeys
Canvas                 bsddb                  modulefinder
CommandNotFound        butterfly              multifile
ConfigParser           bz2                    multiprocessing
ContainerIO            cPickle                musicbrainz2
Cookie                 cProfile               mutagen
Crypto                 cStringIO              mutex
CurImagePlugin         cairo                  mx
DLFCN                  calendar               netrc
DcxImagePlugin         cdrom                  new
Dialog                 cgi                    nis
DiscID                 cgitb                  nntplib
DistUpgrade            checkbox               ntpath

Solution 13 - Python

Try these

pip list

or

pip freeze

Solution 14 - Python

Very simple searching using pkgutil.iter_modules

from pkgutil import iter_modules
a=iter_modules()
while True:
    try: x=a.next()
    except: break
    if 'searchstr' in x[1]: print x[1]

Solution 15 - Python

on windows, Enter this in cmd

c:\python\libs>python -m pip freeze

Solution 16 - Python

I ran into a custom installed python 2.7 on OS X. It required X11 to list modules installed (both using help and pydoc).

To be able to list all modules without installing X11 I ran pydoc as http-server, i.e.:

pydoc -p 12345

Then it's possible to direct Safari to http://localhost:12345/ to see all modules.

Solution 17 - Python

Warning: Adam Matan discourages this use in pip > 10.0. Also, read @sinoroc's comment below

This was inspired by Adam Matan's answer (the accepted one):

import tabulate
try:
  from pip import get_installed_distributions
except:
  from pip._internal.utils.misc import get_installed_distributions

tabpackages = []
for _, package in sorted([('%s %s' % (i.location, i.key), i) for i in get_installed_distributions()]):
  tabpackages.append([package.location, package.key, package.version])

print(tabulate.tabulate(tabpackages))

which then prints out a table in the form of

19:33 pi@rpi-v3 [iot-wifi-2] ~/python$ python installed_packages.py
-------------------------------------------  --------------  ------
/home/pi/.local/lib/python2.7/site-packages  enum-compat     0.0.2
/home/pi/.local/lib/python2.7/site-packages  enum34          1.1.6
/home/pi/.local/lib/python2.7/site-packages  pexpect         4.2.1
/home/pi/.local/lib/python2.7/site-packages  ptyprocess      0.5.2
/home/pi/.local/lib/python2.7/site-packages  pygatt          3.2.0
/home/pi/.local/lib/python2.7/site-packages  pyserial        3.4
/usr/local/lib/python2.7/dist-packages       bluepy          1.1.1
/usr/local/lib/python2.7/dist-packages       click           6.7
/usr/local/lib/python2.7/dist-packages       click-datetime  0.2
/usr/local/lib/python2.7/dist-packages       construct       2.8.21
/usr/local/lib/python2.7/dist-packages       pyaudio         0.2.11
/usr/local/lib/python2.7/dist-packages       tabulate        0.8.2
-------------------------------------------  --------------  ------

which lets you then easily discern which packages you installed with and without sudo.


A note aside: I've noticed that when I install a packet once via sudo and once without, one takes precedence so that the other one isn't being listed (only one location is shown). I believe that only the one in the local directory is then listed. This could be improved.

Solution 18 - Python

This solution is primary based on modules importlib and pkgutil and work with CPython 3.4 and CPython 3.5, but has no support for the CPython 2.


Explanation

  1. sys.builtin_module_names - names all built-in modules (look my answer here)
  2. pkgutil.iter_modules() - returns an information about all available modules
  3. importlib.util.find_spec() - returns an information about importing module, if exists
  4. BuiltinImporter - an importer for built-in modules (docs)
  5. SourceFileLoader - an importer for a standard Python module (by default has extension *.py) (docs)
  6. ExtensionFileLoader - an importer for modules as shared library (written on the C or C++)

Full code

import sys
import os
import shutil
import pkgutil
import importlib
import collections

if sys.version_info.major == 2:
    raise NotImplementedError('CPython 2 is not supported yet')


def main():

    # name this file (module)
    this_module_name = os.path.basename(__file__).rsplit('.')[0]

    # dict for loaders with their modules
    loaders = collections.OrderedDict()

    # names`s of build-in modules
    for module_name in sys.builtin_module_names:

        # find an information about a module by name
        module = importlib.util.find_spec(module_name)

        # add a key about a loader in the dict, if not exists yet
        if module.loader not in loaders:
            loaders[module.loader] = []

        # add a name and a location about imported module in the dict
        loaders[module.loader].append((module.name, module.origin))

    # all available non-build-in modules
    for module_name in pkgutil.iter_modules():

        # ignore this module
        if this_module_name == module_name[1]:
            continue

        # find an information about a module by name
        module = importlib.util.find_spec(module_name[1])

        # add a key about a loader in the dict, if not exists yet
        loader = type(module.loader)
        if loader not in loaders:
            loaders[loader] = []

        # add a name and a location about imported module in the dict
        loaders[loader].append((module.name, module.origin))

    # pretty print
    line = '-' * shutil.get_terminal_size().columns
    for loader, modules in loaders.items():
        print('{0}\n{1}: {2}\n{0}'.format(line, len(modules), loader))
        for module in modules:
            print('{0:30} | {1}'.format(module[0], module[1]))


if __name__ == '__main__':
    main()

Usage

For the CPython3.5 (truncated)

$ python3.5 python_modules_info.py 
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
30: <class '_frozen_importlib.BuiltinImporter'>
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
_ast                           | built-in
_codecs                        | built-in
_collections                   | built-in
_functools                     | built-in
_imp                           | None
_io                            | built-in
_locale                        | built-in
_operator                      | built-in
_signal                        | built-in
_sre                           | built-in
_stat                          | built-in
_string                        | built-in
_symtable                      | built-in
_thread                        | built-in
(****************************truncated*******************************)
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
227: <class '_frozen_importlib_external.SourceFileLoader'>
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
__future__                     | /usr/local/lib/python3.5/__future__.py
_bootlocale                    | /usr/local/lib/python3.5/_bootlocale.py
_collections_abc               | /usr/local/lib/python3.5/_collections_abc.py
_compat_pickle                 | /usr/local/lib/python3.5/_compat_pickle.py
_compression                   | /usr/local/lib/python3.5/_compression.py
_dummy_thread                  | /usr/local/lib/python3.5/_dummy_thread.py
_markupbase                    | /usr/local/lib/python3.5/_markupbase.py
_osx_support                   | /usr/local/lib/python3.5/_osx_support.py
_pydecimal                     | /usr/local/lib/python3.5/_pydecimal.py
_pyio                          | /usr/local/lib/python3.5/_pyio.py
_sitebuiltins                  | /usr/local/lib/python3.5/_sitebuiltins.py
(****************************truncated*******************************)
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
64: <class '_frozen_importlib_external.ExtensionFileLoader'>
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
_bisect                        | /usr/local/lib/python3.5/lib-dynload/_bisect.cpython-35m-x86_64-linux-gnu.so
_bz2                           | /usr/local/lib/python3.5/lib-dynload/_bz2.cpython-35m-x86_64-linux-gnu.so
_codecs_cn                     | /usr/local/lib/python3.5/lib-dynload/_codecs_cn.cpython-35m-x86_64-linux-gnu.so
_codecs_hk                     | /usr/local/lib/python3.5/lib-dynload/_codecs_hk.cpython-35m-x86_64-linux-gnu.so
_codecs_iso2022                | /usr/local/lib/python3.5/lib-dynload/_codecs_iso2022.cpython-35m-x86_64-linux-gnu.so
(****************************truncated*******************************)

For the CPython3.4 (truncated)

$ python3.4 python_modules_info.py
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
54: <class '_frozen_importlib.BuiltinImporter'>
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
_ast                           | built-in
_bisect                        | built-in
_codecs                        | built-in
_collections                   | built-in
_datetime                      | built-in
_elementtree                   | built-in
_functools                     | built-in
_heapq                         | built-in
_imp                           | None
_io                            | built-in
_locale                        | built-in
_md5                           | built-in
_operator                      | built-in
_pickle                        | built-in
_posixsubprocess               | built-in
_random                        | built-in
(****************************truncated*******************************)
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
246: <class '_frozen_importlib.SourceFileLoader'>
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
__future__                     | /usr/lib/python3.4/__future__.py
_bootlocale                    | /usr/lib/python3.4/_bootlocale.py
_collections_abc               | /usr/lib/python3.4/_collections_abc.py
_compat_pickle                 | /usr/lib/python3.4/_compat_pickle.py
_dummy_thread                  | /usr/lib/python3.4/_dummy_thread.py
_markupbase                    | /usr/lib/python3.4/_markupbase.py
_osx_support                   | /usr/lib/python3.4/_osx_support.py
_pyio                          | /usr/lib/python3.4/_pyio.py
(****************************truncated*******************************)
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
44: <class '_frozen_importlib.ExtensionFileLoader'>
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
_bz2                           | /usr/lib/python3.4/lib-dynload/_bz2.cpython-34m-x86_64-linux-gnu.so
_codecs_cn                     | /usr/lib/python3.4/lib-dynload/_codecs_cn.cpython-34m-x86_64-linux-gnu.so
_codecs_hk                     | /usr/lib/python3.4/lib-dynload/_codecs_hk.cpython-34m-x86_64-linux-gnu.so
_codecs_iso2022                | /usr/lib/python3.4/lib-dynload/_codecs_iso2022.cpython-34m-x86_64-linux-gnu.so
_codecs_jp                     | /usr/lib/python3.4/lib-dynload/_codecs_jp.cpython-34m-x86_64-linux-gnu.so
_codecs_kr                     | /usr/lib/python3.4/lib-dynload/_codecs_kr.cpython-34m-x86_64-linux-gnu.so
_codecs_tw                     | /usr/lib/python3.4/lib-dynload/_codecs_tw.cpython-34m-x86_64-linux-gnu.so
_crypt                         | /usr/lib/python3.4/lib-dynload/_crypt.cpython-34m-x86_64-linux-gnu.so
(****************************truncated*******************************)

Solution 19 - Python

Aside from using pip freeze I have been installing yolk in my virtual environments.

Solution 20 - Python

In case you have an anaconda python distribution installed, you could also use

$conda list

in addition to solutions described above.

Solution 21 - Python

  1. to get all available modules, run sys.modules
  2. to get all installed modules (read: installed by pip), you may look at pip.get_installed_distributions()

For the second purpose, example code:

import pip
for package in pip.get_installed_distributions():
    name = package.project_name # SQLAlchemy, Django, Flask-OAuthlib
    key = package.key # sqlalchemy, django, flask-oauthlib
    module_name = package._get_metadata("top_level.txt") # sqlalchemy, django, flask_oauthlib
    location = package.location # virtualenv lib directory etc.
    version = package.version # version number

Solution 22 - Python

There are many way to skin a cat.

  • The most simple way is to use the pydoc function directly from the shell with:
    pydoc modules

  • But for more information use the tool called pip-date that also tell you the installation dates.
    pip install pip-date


enter image description here

Solution 23 - Python

pip freeze does it all finding packages however one can simply write the following command to list all paths where python packages are.

>>> import site; site.getsitepackages()
['/usr/local/lib/python2.7/dist-packages', '/usr/lib/python2.7/dist-packages']

Solution 24 - Python

There are many ideas, initially I am pondering on these two:

pip

> cons: not always installed

help('modules')

> cons: output to console; with broken modules (see ubuntu...) can segfault

I need an easy approach, using basic libraries and compatible with old python 2.x

And I see the light: listmodules.py

Hidden in the documentation source directory in 2.5 is a small script that lists all available modules for a Python installation.

Pros: > uses only imp, sys, os, re, time > > designed to run on Python 1.5.2 and newer > > the source code is really compact, so you can easy tinkering with it, for example to pass an exception list of buggy modules (don't try to import them)

Solution 25 - Python

I needed to find the specific version of packages available by default in AWS Lambda. I did so with a mashup of ideas from this page. I'm sharing it for posterity.

import pkgutil

__version__ = '0.1.1'

def get_ver(name):
    try:
        return str(__import__(name).__version__)
    except:
        return None

def lambda_handler(event, context):
    return {
        'statusCode': 200,
        'body': [{
                   'path': m.module_finder.path,
                   'name': m.name,
                   'version': get_ver(m.name),
                 } for m in list(pkgutil.iter_modules())
                 #if m.module_finder.path == "/var/runtime" # Uncomment this if you only care about a certain path
                ],
    }

What I discovered is that the provided boto3 library was way out of date and it wasn't my fault that my code was failing. I just needed to add boto3 and botocore to my project. But without this I would have been banging my head thinking my code was bad.

{
  "statusCode": 200,
  "body": [
    {
      "path": "/var/task",
      "name": "lambda_function",
      "version": "0.1.1"
    },
    {
      "path": "/var/runtime",
      "name": "bootstrap",
      "version": null
    },
    {
      "path": "/var/runtime",
      "name": "boto3",
      "version": "1.9.42"
    },
    {
      "path": "/var/runtime",
      "name": "botocore",
      "version": "1.12.42"
    },
    {
      "path": "/var/runtime",
      "name": "dateutil",
      "version": "2.7.5"
    },
    {
      "path": "/var/runtime",
      "name": "docutils",
      "version": "0.14"
    },
    {
      "path": "/var/runtime",
      "name": "jmespath",
      "version": "0.9.3"
    },
    {
      "path": "/var/runtime",
      "name": "lambda_runtime_client",
      "version": null
    },
    {
      "path": "/var/runtime",
      "name": "lambda_runtime_exception",
      "version": null
    },
    {
      "path": "/var/runtime",
      "name": "lambda_runtime_marshaller",
      "version": null
    },
    {
      "path": "/var/runtime",
      "name": "s3transfer",
      "version": "0.1.13"
    },
    {
      "path": "/var/runtime",
      "name": "six",
      "version": "1.11.0"
    },
    {
      "path": "/var/runtime",
      "name": "test_bootstrap",
      "version": null
    },
    {
      "path": "/var/runtime",
      "name": "test_lambda_runtime_client",
      "version": null
    },
    {
      "path": "/var/runtime",
      "name": "test_lambda_runtime_marshaller",
      "version": null
    },
    {
      "path": "/var/runtime",
      "name": "urllib3",
      "version": "1.24.1"
    },
    {
      "path": "/var/lang/lib/python3.7",
      "name": "__future__",
      "version": null
    },
...

What I discovered was also different from what they officially publish. At the time of writing this:

> - Operating system – Amazon Linux > - AMI – amzn-ami-hvm-2017.03.1.20170812-x86_64-gp2 > - Linux kernel – 4.14.77-70.59.amzn1.x86_64 > - AWS SDK for JavaScript – 2.290.0
> - SDK for Python (Boto 3) – 3-1.7.74 botocore-1.10.74

Solution 26 - Python

Here is a python code solution that will return a list of modules installed. One can easily modify the code to include version numbers.

import subprocess
import sys
from pprint import pprint

installed_packages = reqs = subprocess.check_output([sys.executable, '-m', 'pip', 'freeze']).decode('utf-8')
installed_packages = installed_packages.split('\r\n')
installed_packages = [pkg.split('==')[0] for pkg in installed_packages if pkg != '']
pprint(installed_packages)

Solution 27 - Python

Installation

pip install pkgutil

Code

import pkgutil

for i in pkgutil.iter_modules(None): # returns a tuple (path, package_name, ispkg_flag)
    print(i[1]) #or you can append it to a list

Sample Output:

multiprocessing
netrc
nntplib
ntpath
nturl2path
numbers
opcode
pickle
pickletools
pipes
pkgutil

Solution 28 - Python

pip install pip-chill 
pip-chill

Solution 29 - Python

If none of the above seem to help, in my environment was broken from a system upgrade and I could not upgrade pip. While it won't give you an accurate list you can get an idea of which libraries were installed simply by looking inside your env>lib>python(version here)>site-packages> . Here you will get a good indication of modules installed.

Solution 30 - Python

For anyone wondering how to call pip list from a Python program you can use the following:

import pip
pip.main(['list])  # this will print all the packages

Solution 31 - Python

From the shell

ls site-packages

If that's not helpful, you can do this.

import sys
import os
for p in sys.path:
    print os.listdir( p )

And see what that produces.

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