如何检查python模块的版本？

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.

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:\> 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 "<string>", line 1, in <module>
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

You can try

>>> import statlib
>>> print statlib.__version__

>>> import construct
>>> print contruct.__version__

Use module distributed with library. Note that the string that you pass to get_distribution method should correspond to the PyPI entry.

>>> import pkg_resources
>>> pkg_resources.get_distribution("construct").version
'2.5.2'

and if you want to run it from the command line you can do:

python -c "import pkg_resources; print(pkg_resources.get_distribution('construct').version)"

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).

I think this can help but first install show package in order to run pip show then use show to find the version!

sudo pip install show
# in order to get package version execute the below command
sudo pip show YOUR_PACKAGE_NAME | grep Version

The Better way to do that is:

For the details of specific Package

It details out the Package_name, Version, Author, Location etc.

pip install --upgrade pip

On Windows recommend command is:

python -m pip install --upgrade pip

In python3 with brackets around print

>>> import celery
>>> print(celery.__version__)
3.1.14

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()  # -> [distribute 0.6.16 (...), ...]

[
    pkg.key + ': ' + pkg.version
    for pkg in pip.get_installed_distributions()
    if pkg.key in ['setuptools', 'statlib', 'construct']
] # -> nicely filtered list of ['setuptools: 3.3', ...]

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__ 

You can use importlib_metadata library for this.

If you’re on python <3.8, first install it with:

pip install importlib_metadata

Since python 3.8 it’s included in the standard library.

Then, to check a package’s version (in this example lxml) run:

>>> from importlib_metadata import version
>>> version('lxml')
'4.3.1'

Keep in mind that this works only for packages installed from PyPI. Also, you must pass a package name as an argument to the version method, rather than a module name that this package provides (although they’re usually the same).

Use dir() to find out if the module has a __version__ attribute at all.

>>> import selenium
>>> dir(selenium)
['__builtins__', '__doc__', '__file__', '__name__',
 '__package__', '__path__', '__version__']
>>> selenium.__version__
'3.141.0'
>>> selenium.__path__
['/venv/local/lib/python2.7/site-packages/selenium']

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.

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

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

Some modules don’t have __version__ attribute, so the easiest way is check in the terminal: pip list

In Python 3.8 version there is a new module in importlib package, which can do that as well.

Here is an example from docs:

>>> from importlib.metadata import version
>>> version('requests')
'2.22.0'

I suggest opening a python shell in terminal (in the python version you are interested), importing the library, and getting its __version__ attribute.

>>> import statlib
>>> statlib.__version__

>>> import construct
>>> 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.

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.

>>>!pip show lxml | grep Version
Version: 4.1.0

>>>!pip freeze | grep lxml
lxml==4.1.0

>>>!pip list | grep lxml
lxml                               4.1.0                  

>>>!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

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

(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.

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) & set(globals())]

Result:

>>> import sys, pip, nltk, bs4
>>> [{pkg.key : pkg.version} for pkg in pip.get_installed_distributions() if pkg.key in set(sys.modules) & 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?

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

In Summary:

conda list   

(It will provide all the libraries along with version details).

And:

pip show tensorflow

(It gives complete library details).

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:

1. Open the command prompt.
2. Navigate to the file address/directory by using cd [file address] where you’ve kept your python and all supporting modules installed.
3. use the command “pip install [module name]” and hit enter.
4. This will show you a message as “Requirement already satisfied: file address\folder name (with version)“.
5. See the screenshot below for ex: I had to know the version of a pre-installed module named as “Selenium-Screenshot”. It showed me correctly as 1.5.0:

You can try this:

pip list

This will output all the packages with their versions. Output

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