In shell script I am checking whether this packages are installed or not, if not installed then install it. So withing shell script:

import nltk
echo nltk.__version__

but it stops shell script at import line

in linux terminal tried to see in this manner:

which nltk

which gives nothing thought it is installed.

Is there any other way to verify this package installation in shell script, if not installed, also install it.

import nltk is Python syntax, and as such won’t work in a shell script.

To test the version of nltk and scikit_learn, you can write a Python script and run it. Such a script may look like

import nltk
import sklearn

print('The nltk version is {}.'.format(nltk.__version__))
print('The scikit-learn version is {}.'.format(sklearn.__version__))

# The nltk version is 3.0.0.
# The scikit-learn version is 0.15.2.

Note that not all Python packages are guaranteed to have a __version__ attribute, so for some others it may fail, but for nltk and scikit-learn at least it will work.

Try this:

$ python -c "import nltk; print nltk.__version__"

In Windows® systems you can simply try

pip3 list | findstr scikit

scikit-learn                  0.22.1

If you are on Anaconda try

conda list scikit

scikit-learn              0.22.1           py37h6288b17_0

And this can be used to find out the version of any package you have installed. For example

pip3 list | findstr numpy

numpy                         1.17.4
numpydoc                      0.9.2

Or if you want to look for more than one package at a time

pip3 list | findstr "scikit numpy"

numpy                         1.17.4
numpydoc                      0.9.2
scikit-learn                  0.22.1

Note the quote characters are required when searching for more than one word.

Take care.

For checking the version of scikit-learn in shell script, if you have pip installed, you can try this command

pip freeze | grep scikit-learn
scikit-learn==0.17.1

Hope it helps!

You can find NLTK version simply by doing:

In [1]: import nltk

In [2]: nltk.__version__
Out[2]: '3.2.5'

And similarly for scikit-learn,

In [3]: import sklearn

In [4]: sklearn.__version__
Out[4]: '0.19.0'

I’m using python3 here.

you may check from a python notebook cell as follows

!pip install --upgrade nltk     # needed if nltk is not already installed
import nltk      
print('The nltk version is {}.'.format(nltk.__version__))
print('The nltk version is '+ str(nltk.__version__))

and

#!pip install --upgrade sklearn      # needed if sklearn is not already installed
import sklearn
print('The scikit-learn version is {}.'.format(sklearn.__version__))
print('The scikit-learn version is '+ str(nltk.__version__))

In my machine which is ubuntu 14.04 with python 2.7 installed, if I go here,

/usr/local/lib/python2.7/dist-packages/nltk/

there is a file called

VERSION.

If I do a cat VERSION it prints 3.1, which is the NLTK version installed.