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Failed to import dataclasses module

Today I installed python 3.7 from apt-get to try out the new dataclasses module. I installed it seperately because python3.6 wasn't upgradeable to 3.7.
When I type: python3.7 --version, it gives me: >>> Python 3.7.0a2 as my current version.
The problem is that I can't seem to import dataclasses.
my import statement is: from dataclasses import dataclass as instructed here
This is the error message it's giving me:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'dataclasses'
Error in sys.excepthook:
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 63, in apport_excepthook
from apport.fileutils import likely_packaged, get_recent_crashes
File "/usr/lib/python3/dist-packages/apport/__init__.py", line 5, in <module>
from apport.report import Report
File "/usr/lib/python3/dist-packages/apport/report.py", line 30, in <module>
import apport.fileutils
File "/usr/lib/python3/dist-packages/apport/fileutils.py", line 23, in <module>
from apport.packaging_impl import impl as packaging
File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 24, in <module>
import apt
File "/usr/lib/python3/dist-packages/apt/__init__.py", line 23, in <module>
import apt_pkg
ModuleNotFoundError: No module named 'apt_pkg'
Original exception was:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'dataclasses'
I even tried installing the dataclasses module with pip3: pip3 install dataclasses. Not sure if that's necessary though.
Any suggestion on what might be the problem?
[EDIT] Just tried it with a python3.6 console and it worked fine .. weird.

As suggested by #wim python3.7 -m venv venv_dir
This command will:
Use python3.7 to run the command
The -m flag tells the interpreter to run the next argument as a script
venv is a module, and because of the -m flag it will be run as a script
Finally, the venv_dir is given to the venv module as an argument which
this module will use to create a virtual environment directory at
Once this command is run now you'll have a nice sandbox for messing around/testing the dataclasses module.
To activate this virtual environment be sure to run source venv_dir/bin/activate before you begin. This command will run the script at venv_dir/bin/activate to set up the necessary environment variables and other things for you
To deactivate, simply run deactivate after activating

python3 pip broken. missing distutils

I have been trying to get pip with python3 on WSL ubuntu 16.04 and have had no success. I have been running sudo apt install --reinstall python3-pip, but still have issues getting pip to work properly.
$ pip3
Traceback (most recent call last):
File "/usr/bin/pip3", line 9, in <module>
from pip import main
File "/usr/lib/python3/dist-packages/pip/__init__.py", line 14, in
<module>
from pip.utils import get_installed_distributions, get_prog
File "/usr/lib/python3/dist-packages/pip/utils/__init__.py", line 23, in
<module>
from pip.locations import (
File "/usr/lib/python3/dist-packages/pip/locations.py", line 9, in
<module>
from distutils import sysconfig
ImportError: No module named 'distutils'
Similar with sudo
$ sudo pip3
Traceback (most recent call last):
File "/usr/bin/pip3", line 9, in <module>
from pip import main
File "/usr/lib/python3/dist-packages/pip/__init__.py", line 14, in
<module>
from pip.utils import get_installed_distributions, get_prog
File "/usr/lib/python3/dist-packages/pip/utils/__init__.py", line 23, in
<module>
from pip.locations import (
File "/usr/lib/python3/dist-packages/pip/locations.py", line 9, in <module>
from distutils import sysconfig
ImportError: No module named 'distutils'
Also I noticed that I seem to have two versions of python3 installed:
$ ls /usr/lib | grep python
python2.7
python3
python3.5

According to Python 3 documentation, distutils apparently is not deprecated, BUT, my install of 2.7 has disutils, but 3.6 does not.
When I read:
https://docs.python.org/3/installing/
It seemed to say that distutils was being deprecated, but it was not worded clearly if they were talking about distutils or something else.
If anyone knows the definitive answer, please let us know.

So after a lot of pain, I finally gave in. I had made things worse and corrupted my entire python3 installation. I had corrupted too many files trying to fix everything. I ended up uninstalling WSL/ubuntu and reinstalling clean. I made of backup a few things first.
Unfortunately, this seems to be the best option if you have really messed this up, like I did. Being more careful now, python3 is working just fine, with pip. Make sure you follow official docs when you install.

Using Pip and Importing Packages in Python 3 on Ubuntu

I'm on Lubuntu (a minimal build of Ubuntu). I installed Python 3.6.1 with:
sudo apt-get install python3.6
I want to use Twilio, so I tried this:
pip install twilio
It said pip wasn't recognized, so I ran this, followed by the above again:
sudo apt install python-pip
I fired up Python 3.6 and tried importing it, but that didn't work out:
>>> from twilio.rest import Client
ModuleNotFoundError: No module named 'twilio'
Error in sys.excepthook:
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 63, in apport_excepthook
from apport.fileutils import likely_packaged, get_recent_crashes
File "/usr/lib/python3/dist-packages/apport/__init__.py", line 5, in <module>
from apport.report import Report
File "/usr/lib/python3/dist-packages/apport/report.py", line 30, in <module>
import apport.fileutils
File "/usr/lib/python3/dist-packages/apport/fileutils.py", line 23, in <module>
from apport.packaging_impl import impl as packaging
File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 24, in <module>
import apt
File "/usr/lib/python3/dist-packages/apt/__init__.py", line 23, in <module>
import apt_pkg
ModuleNotFoundError: No module named 'apt_pkg'
I'm new to python3 (which I want to use for the secrets module), Ubuntu, and twilio, so I'm not really sure what's going on here. I'd think if it was as simple as a module not being found, the stack trace would be much shorter... I'm not sure if the stack trace is so long because maybe Python 3 produces longer ones than 2 did, or Ubuntu is trying to do something weird because both Python 2 and 3 are installed (and perhaps two versions of 3 at that), or if maybe this is the work of twilio?

Try the following to download pip:
wget https://bootstrap.pypa.io/get-pip.py
Then install pip by running:
sudo python3 get-pip.py
Then you can install twilio with pip
sudo pip3 install twilio

Problems with python versions and environemnts on os x El Capitan

I'm learning python and I'm using OS X. I've installed anaconda 3 and set up env called testenv with python 3.5. Then I activated recently created env and installed several packages such as numpy, pandas and opencv3. Nevertheless, when I run python shell and type "import numpy" I get the following errors:
>>> import numpy
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python2.7/site-packages/numpy/__init__.py", line 180, in <module>
from . import add_newdocs
File "/usr/local/lib/python2.7/site-packages/numpy/add_newdocs.py", line 13, in <module>
from numpy.lib import add_newdoc
File "/usr/local/lib/python2.7/site-packages/numpy/lib/__init__.py", line 8, in <module>
from .type_check import *
File "/usr/local/lib/python2.7/site-packages/numpy/lib/type_check.py", line 11, in <module>
import numpy.core.numeric as _nx
File "/usr/local/lib/python2.7/site-packages/numpy/core/__init__.py", line 14, in <module>
from . import multiarray
ImportError: dlopen(/usr/local/lib/python2.7/site-packages/numpy/core/multiarray.so, 2): Symbol not found: _PyBuffer_Type
Referenced from: /usr/local/lib/python2.7/site-packages/numpy/core/multiarray.so
Expected in: flat namespace
in /usr/local/lib/python2.7/site-packages/numpy/core/multiarray.so
The same happens with other packages.

File "/usr/local/lib/python2.7/site-packages/numpy/init.py", line
180, in
Python is picking up the packages from the system's Python packages and not from the packages installed in your virtualenv i.e. testenv.
Be sure that you have activated the virtualenv with something like:
source testenv/bin/activate
and then try running Python.
And you said you set it up with Python 3.5 but it's picking path with python2.7.
Let me know if that solves your problem.

I solved this problem by simply writing this command:
sudo python3 -m pip install --upgrade numpy
Another possible method to fix it is to eliminate /usr/local/lib/python2.7 in PYTHONPATH

On a Mac.... this is how to do this safely
brew install python3
Lets now add a virtual env called pe35
python3 -m venv ~/pe35
Now lets use the virtualenv
source ~/pe35/bin/activate
If you want a symbol - place this in you .bash_profile
alias pe35='source ~/pe35/bin/activate'
Now to install numpy in your virtualenv
pip install numpy

Passing Python3 to virtualenvwrapper throws up ImportError

I'm trying to use the virtualenvwrapper to make a python 3 based virtualenv. However,I'm when I pass the optional interpreter argument, I'm seeing this error. I'm running Ubuntu 15.04. I tried reinstalling virtualenv and virtualenvwrapper without success. Thanks for all your help!
$ mkvirtualenv scriptcutter --python=/usr/bin/python3
Running virtualenv with interpreter /usr/bin/python3
Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/virtualenv.py", line 8, in <module>
import base64
File "/usr/lib/python3.4/base64.py", line 9, in <module>
import re
File "/usr/lib/python3.4/re.py", line 336, in <module>
import copyreg
File "/usr/local/lib/python2.7/dist-packages/copyreg/__init__.py", line 7, in <module>
raise ImportError('This package should not be accessible on Python 3. '
ImportError: This package should not be accessible on Python 3. Either you are trying to run from the python-future src folder or your installation of python-future is corrupted.
Error in sys.excepthook:
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 53, in apport_excepthook
if not enabled():
File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 24, in enabled
import re
File "/usr/lib/python3.4/re.py", line 336, in <module>
import copyreg
File "/usr/local/lib/python2.7/dist-packages/copyreg/__init__.py", line 7, in <module>
raise ImportError('This package should not be accessible on Python 3. '
ImportError: This package should not be accessible on Python 3. Either you are trying to run from the python-future src folder or your installation of python-future is corrupted.
Original exception was:
Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/virtualenv.py", line 8, in <module>
import base64
File "/usr/lib/python3.4/base64.py", line 9, in <module>
import re
File "/usr/lib/python3.4/re.py", line 336, in <module>
import copyreg
File "/usr/local/lib/python2.7/dist-packages/copyreg/__init__.py", line 7, in <module>
raise ImportError('This package should not be accessible on Python 3. '
ImportError: This package should not be accessible on Python 3. Either you are trying to run from the python-future src folder or your installation of python-future is corrupted.

I come across same issue, but after I downgrade virtualenv to 12.0.2, this problem disappears.

This is sort of a workaround for now.
Create a virtualenv using pyvenv.
# install pyvenv on Ubuntu
sudo apt-get install python3-venv
To minimize disruption in your normal workflow, pass a destination directory that is the same as the one used by virtualenvwrapper Like so,
pyvenv example ~/.virtualenvs/example
This is automatically working with workon and cdproject commands. I don't use much else that is provided by virtualenvwrapper
Hope this helps.

You can upgrade to the most recent version of virtualenv, with:
sudo pip install --upgrade https://github.com/pypa/virtualenv/archive/master.zip
virtualenv --version
# Returns 15.2.0.dev0 when I ran it
The following command then works:
mkvirtualenv scriptcutter --python=/usr/bin/python3
Apparently, the develop branch was dropped, so the URL with "develop" will no longer work. My answer was based off of #pjotr_dolphin's comment, with the URL updated.