Python version conflicts and pip3

Question

It is a tough situation I am dealing with. Here is short version of my problem:

I am working on Ubuntu 12.04
I would like to install Python 3.5.x with openCV library. I would also like to use pip3 for managing package installation of python.

Here is how the version of my pythons looks like

    $ python --version
      Python 2.7.3
    $ python3 --version
      Python 3.5.2

So far it looks I have achieved my goal.

When I use virtualenv to manage python3 libraries:

   virtualenv -p /usr/bin/python3 py3env
   source py3env/bin/activate

I see the version of my python as follows:

   (py3env)yxxxxa@yxxxxa-Precision-M4800:~$ python3 --version
    Python 3.2.3

I seems there is another version of python in my machine 3.2.3 messing up with the version 3.5.2 that I have installed. This is my first problem.

The second related problem is that I am unable to install pip 3. There is this error I receive due to the same python version conflict:

 $ pip
/usr/local/lib/python3.2/dist-packages/pip-8.1.2-py3.2.egg/pip/_vendor /pkg_resources/__init__.py:80: UserWarning: Support for Python 3.0-3.2 has been dropped. Future versions will fail here.
  warnings.warn(msg)
 Traceback (most recent call last):
   File "/usr/local/bin/pip", line 9, in <module>
 load_entry_point('pip==8.1.2', 'console_scripts', 'pip')()
   File "/usr/lib/python3/dist-packages/pkg_resources.py", line 337, in  load_entry_point
 return get_distribution(dist).load_entry_point(group, name)
   File "/usr/lib/python3/dist-packages/pkg_resources.py", line 2280, in load_entry_point
 return ep.load()
    File "/usr/lib/python3/dist-packages/pkg_resources.py", line 1990, in load
  entry = __import__(self.module_name, globals(),globals(), ['__name__'])
    File "/usr/local/lib/python3.2/dist-packages/pip-8.1.2-py3.2.egg/pip/__init__.py", line 16, in <module>
   from pip.vcs import git, mercurial, subversion, bazaar  # noqa
    File "/usr/local/lib/python3.2/dist-packages/pip-8.1.2-py3.2.egg/pip/vcs/mercurial.py", line 9, in <module>
   from pip.download import path_to_url
    File "/usr/local/lib/python3.2/dist-packages/pip-8.1.2-py3.2.egg/pip/download.py", line 36, in <module>
   from pip.utils.ui import DownloadProgressBar, DownloadProgressSpinner
    File "/usr/local/lib/python3.2/dist-packages/pip-8.1.2-py3.2.egg/pip/utils/ui.py", line 15, in <module>
   from pip._vendor.progress.bar import Bar, IncrementalBar
    File "/usr/local/lib/python3.2/dist-packages/pip-8.1.2-py3.2.egg/pip/_vendor/progress/bar.py", line 48
empty_fill = u'∙'
                  ^
   SyntaxError: invalid syntax
   yasharatena@yasharatena-Precision-M4800:~$ pip3
  /usr/local/lib/python3.2/dist-packages/pip-8.1.2-py3.2.egg/pip/_vendor/pkg_resources/__init__.py:80: UserWarning: Support for Python 3.0-3.2 has been dropped. Future versions will fail here.
   warnings.warn(msg)
   Traceback (most recent call last):
    File "/usr/local/bin/pip3", line 9, in <module>
   load_entry_point('pip==8.1.2', 'console_scripts', 'pip3')()
    File "/usr/lib/python3/dist-packages/pkg_resources.py", line 337, in load_entry_point
   return get_distribution(dist).load_entry_point(group, name)
    File "/usr/lib/python3/dist-packages/pkg_resources.py", line 2280, in  load_entry_point
   return ep.load()
   File "/usr/lib/python3/dist-packages/pkg_resources.py", line 1990, in load
   entry = __import__(self.module_name, globals(),globals(), ['__name__'])
   File "/usr/local/lib/python3.2/dist-packages/pip-8.1.2-py3.2.egg/pip/__init__.py", line 16, in <module>
    from pip.vcs import git, mercurial, subversion, bazaar  # noqa
    File "/usr/local/lib/python3.2/dist-packages/pip-8.1.2-py3.2.egg/pip/vcs/mercurial.py", line 9, in <module>
from pip.download import path_to_url
    File "/usr/local/lib/python3.2/dist-packages/pip-8.1.2-py3.2.egg/pip/download.py", line 36, in <module>
    from pip.utils.ui import DownloadProgressBar, DownloadProgressSpinner
    File "/usr/local/lib/python3.2/dist-packages/pip-8.1.2-py3.2.egg/pip/utils/ui.py", line 15, in <module>
    from pip._vendor.progress.bar import Bar, IncrementalBar
    File "/usr/local/lib/python3.2/dist-packages/pip-8.1.2-py3.2.egg/pip/_vendor/progress/bar.py", line 48
    empty_fill = u'∙'
                  ^
    SyntaxError: invalid syntax

What are your expert opinions about the stated problem? Any cool idea to handle this? Thanks alot in advance

So there is your answer. You're creating virtualenv from different binary. `/usr/bin/python3 --version` is 3.2.3., `/usr/local/bin/python3 --version` is 3.5.2. — Łukasz Rogalski, Sep 11 '16 at 15:17
Thanks. This solved my first problem. Now the second problem aslo remains, how can I install pip3 under python 3.5.2 (preferably using viretualenv) ? — yas yasi, Sep 11 '16 at 21:03

score 1 · Answer 1 · edited May 23 '17 at 12:08

This solved my first problem. Now the second problem aslo remains, how can I install pip3 under python 3.5.2 (preferably using viretualenv) ?

Here is answer:

python3 -m virtualenv py3env

source py3env/bin/activate

Python 3.5 should have pip by default, also after above commands You can use pip:)

For example :

python -m pip install requests

EDIT:

Here You could find very good explainations if You still need install pip after create virtualenv.

Python version conflicts and pip3

1 Answers1