How to install pip and python Virtual Environment virtualenv in Ubuntu

How to install pip and python Virtual Environment virtualenv in Ubuntu

In ubuntu, although Python 2 is provided, there is no pip. I encountered some problems during the recent installation of pip and tried many methods on the Internet. Such as sudo apt install python3-pip

However, if you have tried it, there are still problems.

I have figured out some methods, which are effective for my tests.

(1) download pip

(2) unzip and install

Input tar-xf pip-9.0.1.tar.gz

Enter

Sudo python3 setup. py install

Test:

Pip-v

Install the python Virtual Environment virtualenv

Virtualenv is a tool used to create an isolated Python environment. Virtualenv creates a folder containing all the necessary executable files to use the packages required by the Python project.

Pip install virtualenv

Create a virtual environment

Mkdir [virtual environment directory]

Virtualenv -- no-site-packages-p [python path] [Virtual Environment name]

-- The no-site-packages parameter is used to create an independent python environment.

Start the Virtual Environment

Source (Virtual Environment name)/bin/activate

To install it in a virtual environment, you must enter the corresponding virtual environment.

./Pip install [installation package name] or sudo./pip install [installation package name]

./Pip is to run pip in the current directory for Installation

Exit the Virtual Environment

Deactivate