Ubuntu – ImportError: No module named sklearn

14.04python-2.7scikit learn

I installed scikit-learn on following these instructions

Even when I try now to run again: sudo pip install -U scikit-learn

I get this message proving again that installation is ok:

Requirement already up-to-date: scikit-learn in /home/begueradj/.local/lib/python2.7/site-packages

But I fail to import it:

begueradj@begueradj-Sampo:~/Desktop/begueradj$ python
Python 2.7.6 (default, Mar 22 2014, 22:59:38) 
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import sklearn
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named sklearn

How to resolve this ?

Best Answer

The Ubuntu 14.04 package is named python-sklearn (formerly python-scikits-learn) and can be installed in Ubuntu 14.04-19.04 using the following command:

sudo apt install python-sklearn

The python-sklearn package is in the default repositories in Ubuntu 14.04 as well as in other currently supported Ubuntu releases.

In Ubuntu 16.04 and later the Python 3 version of python-sklearn can be installed from the default Ubuntu repositories with the following command:

sudo apt install python3-sklearn

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Ubuntu – python 2.7 => ImportError: No module named _io

In addition to standard library and 3rd-party modules Python also has builtin modules. These are written in C and are linked directly in the Python executable. You can find out what these are like this:

$ python
Python 2.7.4 (default, Apr 19 2013, 18:28:01) 
[GCC 4.7.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys.builtin_module_names
('__builtin__', '__main__', '_ast', '_bisect', '_codecs', '_collections', '_functools', '_heapq', '_io', '_locale', '_md5', '_random', '_sha', '_sha256', '_sha512', '_socket', '_sre', '_struct', '_symtable', '_warnings', '_weakref', 'array', 'binascii', 'cPickle', 'cStringIO', 'cmath', 'errno', 'exceptions', 'fcntl', 'gc', 'grp', 'imp', 'itertools', 'marshal', 'math', 'operator', 'posix', 'pwd', 'select', 'signal', 'spwd', 'strop', 'sys', 'syslog', 'thread', 'time', 'unicodedata', 'xxsubtype', 'zipimport', 'zlib')

virtualenv env works by copying /usr/bin/python2.7 into env/bin/python, and then symlinking all the standard library modules into env/lib/python2.7/*.py.

When you upgrade your system Python, you automatically get the updated standard library in all your virtualenvs (because symlinks!), but you're still using the old copy of the Python executable. This means you're also using the old versions of the builtin modules.

Some standard library modules depend on builtin modules. And sometimes Python 2.7.(x+1) standard library depends on builtin modules that got introduced in Python 2.7.(x+1) too. By using an old virtualenv you're in effect trying to use Python 2.7.x with the standard library of Python 2.7.(x+1), and sometimes this breaks.

Re-creating the virtualenv is the correct solution.

(It's probably sufficient to replace the bin/python and bin/python2.7 executables inside the virtualenv, assuming that no new stdlib files appeared in the updated system Python.)

Ubuntu – ImportError: No module named tkinter

To use Tkinter, all you need to do is to import one module:
import Tkinter
Or, more often:
from Tkinter import *

So just change your import line to import Tkinter for example:

$ python
Python 2.7.6 (default, Mar 22 2014, 22:59:56) 
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import Tkinter
>>> Tkinter.TkVersion
8.6
>>>

Source: https://docs.python.org/2/library/tkinter.html#tkinter-modules

Best Answer

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Ubuntu – python 2.7 => ImportError: No module named _io

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