How to check version of python modules

Question

I just installed the python modules  construct and statlib with setuptools like this     Install setuptools to be able to download the following sudo apt-get install python-setuptools    Install statlib for lightweight statistical tools sudo easy install statlib    Install construct for packing unpacking binary data sudo easy install construct   I want to be able to  programmatically  check their versions   Is there an equivalent to python --version I can run from the command line   My python version is 2 7 3

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In Python 3 8 version there is a  new metadata module in importlib package  which can do that as well   Here is an example from docs    gt  gt  gt  from importlib metadata import version  gt  gt  gt  version  requests    2 22 0

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Writing this answer for windows users  As suggested in all other answers  you can use the statements as  import  type the module name  print module   version           module         double underscore   version   double underscore  But  there are some modules which don t print their version even after using the method above  So  what you can simply do is   Open the command prompt  Navigate to the file address directory by using cd   file address  where you ve kept your python and all supporting modules installed  If you have only one python on your system  the PYPI packages are normally visible in the directory folder - Python  gt  Lib  gt  site-packages  use the command  quot pip install  module name  quot  and hit enter  This will show you a message as  quot Requirement already satisfied  file address folder name  with version  quot   See the screenshot below for ex  I had to know the version of a pre-installed module named as  quot Selenium-Screenshot quot   It showed me correctly as 1 5 0

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In python3 with brackets around print   gt  gt  gt  import celery  gt  gt  gt  print celery   version    3 1 14

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You can try  gt  gt  gt  import statlib  gt  gt  gt  print statlib   version     gt  gt  gt  import construct  gt  gt  gt  print contruct   version    Update  This is the approach recommended by PEP 396  But that PEP was never accepted and has been deferred  In fact  there appears to be increasing support amongst Python core developers to recommend not including a   version   attribute  e g  in https   gitlab com python-devs importlib metadata - merge requests 125

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After scouring the internet trying to figure out how to ensure the version of a module im running  apparently python is horrible   version   isnt a thing in 2   across os s and python versions    literally none of these answers worked for my scenario    Then i thought about it a minute and realized the basics    after  30mins of fails     assumes the module is already installed and can be imported   3 7  gt  gt  gt  import sys sqlite3  gt  gt  gt  sys modules get  quot sqlite3 quot   version  2 6 0   gt  gt  gt   quot   quot  join str x  for x in sys version info  3    3 7 2    2 7  gt  gt  gt  import sys sqlite3  gt  gt  gt  sys modules get  quot sqlite3 quot   version  2 6 0   gt  gt  gt   quot   quot  join str x  for x in sys version info  3    2 7 11   literally thats it

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Some modules don t have   version   attribute  so the easiest way is check in the terminal  pip list

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Use pip show to find the version    in order to get package version execute the below command pip show YOUR PACKAGE NAME   grep Version

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I myself work in a heavily restricted server environment and unfortunately none of the solutions here are working for me  There may be no glove solution that fits all  but I figured out a swift workaround by reading the terminal output of pip freeze within my script and storing the modules labels and versions in a dictionary  import os os system  pip freeze  gt  tmpoutput   with open  tmpoutput    r   as f      modules version   f read      module dict    item split  quot    quot   0  item split  quot    quot   -1  for item in modules versions split  quot  n quot     Retrieve your module s versions through passing the module label key  e g    gt  gt   module dict  quot seaborn quot    0 9 0

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The previous answers did not solve my problem  but this code did   import sys  for name  module in sorted sys modules items        if hasattr module     version           print name  module   version

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If the above methods do not work  it is worth trying the following in python   import modulename  modulename version modulename version info   See Get Python Tornado Version   Note  the  version worked for me on a few others besides tornado as well

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The Better way to do that is     For the details of specific Package  pip show  lt package name gt      It details out the Package name  Version  Author  Location etc        pip show numpy Name  numpy Version  1 13 3 Summary  NumPy  array processing for numbers  strings  records  and objects  Home-page  http   www numpy org Author  NumPy Developers Author-email  numpy-discussion python org License  BSD Location  c  users prowinjvm appdata local programs python python36 lib site-packages Requires      For more Details   gt  gt  gt  pip help      pip should be updated to do this   pip install --upgrade pip   On Windows recommend command is    python -m pip install --upgrade pip

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Python  gt   3 8  If you re on python  gt  3 8 you can use a module from the built-in library for that  To check a package s version  in this example construct  run   gt  gt  gt  from importlib metadata import version  gt  gt  gt  version  construct    4 3 1   Python  lt  3 8  Use pkg resources module distributed with setuptools library  Note that the string that you pass to get distribution method should correspond to the PyPI entry   gt  gt  gt  import pkg resources  gt  gt  gt  pkg resources get distribution  construct   version  2 5 2   Side notes   Note that the string that you pass to the get distribution method should be the package name as registered in PyPI  not the module name that you are trying to import  Unfortunately  these aren t always the same  e g  you do pip install memcached  but import memcache    If you want to apply this solution from the command line you can do somthing like    python -c      quot import pkg resources  print pkg resources get distribution  construct   version  quot

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module   version   is a good first thing to try  but it doesn t always work   If you don t want to shell out  and you re using pip 8 or 9  you can still use pip get installed distributions   to get versions from within Python   update  the solution here works in pip 8 and 9  but in pip 10 the function has been moved from pip get installed distributions to pip  internal utils misc get installed distributions to explicitly indicate that it s not for external use  It s not a good idea to rely on it if you re using pip 10      import pip  pip get installed distributions      - gt   distribute 0 6 16                    pkg key          pkg version     for pkg in pip get installed distributions       if pkg key in   setuptools    statlib    construct       - gt  nicely filtered list of   setuptools  3 3

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You can simply use subprocess getoutput python3 --version   import subprocess as sp print sp getoutput python3 --version      or however it suits your needs  py3 version   sp getoutput python3 --version   def check version name  version       check version  python3   py3 version    For more information and ways to do this without depending on the   version   attribute   Assign output of os system to a variable and prevent it from being displayed on the screen  You can also use subprocess check output   which raises an error when the subprocess returns anything other than exit code 0   https   docs python org 3 library subprocess html check output

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In Summary   conda list       It will provide all the libraries along with version details    And    pip show tensorflow    It gives complete library details

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You can try this   pip list   This will output all the packages with their versions  Output

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Assuming we are using Jupyter Notebook  if using Terminal  drop the exclamation marks    1  if the package  e g  xgboost  was installed with pip    pip show xgboost  pip freeze   grep xgboost  pip list   grep xgboost   2  if the package  e g  caffe  was installed with conda    conda list caffe

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To get a list of non-standard  pip  modules imported in the current module     pkg key   pkg version  for pkg in pip get installed distributions       if pkg key in set sys modules   amp  set globals       Result    gt  gt  gt  import sys  pip  nltk  bs4  gt  gt  gt    pkg key   pkg version  for pkg in pip get installed distributions   if pkg key in set sys modules   amp  set globals        pip    9 0 1      nltk    3 2 1      bs4    0 0 1      Note   This code was put together from solutions both on this page and from How to list imported modules

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you can first install some package like this and then check its version  pip install package import package print package   version      it should give you package version

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Building on Jakub Kukul s answer I found a more reliable way to solve this problem   The main problem of that approach is that requires the packages to be installed  conventionally   and that does not include using pip install --user   or be in the system PATH at Python initialisation   To get around that you can use pkg resources find distributions path to search   This basically searches for distributions that would be importable if path to search was in the system PATH   We can iterate through this generator like this   avail modules      distros   pkg resources find distributions path to search  for d in distros      avail modules d key    d version   This will return a dictionary having modules as keys and their version as value  This approach can be extended to a lot more than version number   Thanks to Jakub Kukul for pointing to the right direction

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I suggest using pip in place of easy install  With pip  you can list all installed packages and their versions with   pip freeze   In most linux systems  you can pipe this to grep or findstr on Windows  to find the row for the particular package you re interested in   Linux    pip freeze   grep lxml lxml  2 3  Windows  c   gt  pip freeze   findstr lxml lxml  2 3   For an individual module  you can try the   version   attribute  however there are modules without it     python -c  import requests  print requests   version     2 14 2   python -c  import lxml  print lxml   version     Traceback  most recent call last     File   lt string gt    line 1  in  lt module gt  AttributeError   module  object has no attribute    version      Lastly  as the commands in your question are prefixed with sudo  it appears you re installing to the global python environment  Strongly advise to take look into python virtual environment managers  for example virtualenvwrapper

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Quick python program to list all packges  you can copy it to requirements txt   from pip  internal utils misc import get installed distributions print log      for module in sorted get installed distributions    key lambda x  x key        print log     module key          module version      n  print print log    The output would look like   asn1crypto  0 24 0 attrs  18 2 0 automat  0 7 0 beautifulsoup4  4 7 1 botocore  1 12 98

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Use dir   to find out if the module has a   version   attribute at all     gt  gt  gt  import selenium  gt  gt  gt  dir selenium      builtins        doc        file        name         package        path        version      gt  gt  gt  selenium   version    3 141 0   gt  gt  gt  selenium   path      venv local lib python2 7 site-packages selenium

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I suggest opening a python shell in terminal  in the python version you are interested   importing the library  and getting its   version   attribute    gt  gt  gt  import statlib  gt  gt  gt  statlib   version     gt  gt  gt  import construct  gt  gt  gt  contruct   version     Note 1  We must regard the python version  If we have installed different versions of python  we have to open the terminal in the python version we are interested in  For example  opening the terminal with python3 8 can  surely will  give a different version of a library than opening with python3 5 or python2 7   Note 2  We avoid using the print function  because its behavior depends on python2 or python3  We do not need it  the terminal will show the value of the expression

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This works in Jupyter Notebook on Windows  too  As long as Jupyter is launched from a bash-compliant command line such as Git Bash  MingW64   the solutions given in many of the answers can be used in Jupyter Notebook on Windows systems with one tiny tweak    I m running windows 10 Pro with Python installed via Anaconda  and the following code works when I launch Jupyter via Git Bash  but does not when I launch from the Anaconda prompt    The tweak  Add an exclamation mark     in front of pip to make it  pip    gt  gt  gt  pip show lxml   grep Version Version  4 1 0   gt  gt  gt  pip freeze   grep lxml lxml  4 1 0   gt  gt  gt  pip list   grep lxml lxml                               4 1 0                     gt  gt  gt  pip show lxml Name  lxml Version  4 1 0 Summary  Powerful and Pythonic XML processing library combining libxml2 libxslt with the ElementTree API  Home-page  http   lxml de  Author  lxml dev team Author-email  lxml-dev lxml de License  BSD Location  c  users karls anaconda2 lib site-packages Requires   Required-by  jupyter-contrib-nbextensions

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see also https   stackoverflow com a 56912280 7262247   I found it quite unreliable to use the various tools available  including the best one pkg resources mentioned by Jakub Kukul  answer   as most of them do not cover all cases  For example    built-in modules modules not installed but just added to the python path  by your IDE for example  two versions of the same module available  one in python path superseding the one installed    Since we needed a reliable way to get the version of any package  module or submodule  I ended up writing getversion  It is quite simple to use   from getversion import get module version import foo version  details   get module version foo    See the documentation for details

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first add python  pip to your environment variables  so that you can execute your commands from command prompt  then simply give python command  then import the package   -- import scrapy  then print the version name  -- print scrapy   version      This will definitely work

[python] How to check version of python modules?

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