set virtual environment in python 2 and python 3

beginners how to create an virtual enviroment this site

Install pip first and upgrade it

$ sudo -H pip3 install –upgrade pip

$ sudo -H pip2 install –upgrade pip

$ sudo apt-get install python3-pip

Then install virtualenv using pip3

$ sudo pip3 install virtualenv

Now create a virtual environment

virtualenv venv

you can use any name insted of venv

You can also use a Python interpreter of your choice

$ virtualenv -p /usr/bin/python2.7 venv

Active your virtual environment:

$ source venv/bin/activate

Using fish shell:

$ source venv/bin/activate.fish

To deactivate:

$ deactivate

Create virtualenv using Python3

$ virtualenv -p python3 myenv

Instead of using virtualenv you can use this command in Python3

$ python3 -m venv myenv

if this error below shows below do the procdures below

Command “python setup.py egg_info” failed with error code 1 in /tmp/pip-install-byumuvvr/termcolor/

122
down vote

About the error code

According to python documentation:

This module makes available standard errno system symbols. The value of each symbol is the corresponding integer value. The names and descriptions are borrowed from linux/include/errno.h, which should be pretty all-inclusive.

Error code 1 is defined in errno.h and means Operation not permitted.

About your error

Your setuptools do not appear to be installed. Just follow the Installation Instructions from the pypi website.

If it’s already installed, try

pip install –upgrade setuptools

If it’s already up to date, check that the module ez_setup is not missing. If it is, then

pip install ez_setup

Then try again

pip install unroll

If it’s still not working, maybe pip didn’t install/upgrade setup_tools properly so you might want to try

easy_install -U setuptools

and again

pip install unroll

********Important note*******put sudo before pip or pip3 installation

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