Do I need to install pip?
pip is already installed if you’re using Python 2 >=2.7.9 or Python 3 >=3.4 binaries downloaded from python.org, but you’ll need to upgrade pip.
Additionally, pip will already be installed if you’re working in a Virtual Environment created byvirtualenv or pyvenv.
Installing with get-pip.py
To install pip, securely download get-pip.py. 
Then run the following:
Be cautious if you’re using a Python install that’s managed by your operating system or another package manager. get-pip.py does not coordinate with those tools, and may leave your system in an inconsistent state.
get-pip.py will also install setuptools  and wheel, if they’re not already. setuptools is required to install source distributions. Both are required to be able to build a Wheel Cache (which improves installation speed), although neither are required to install pre-built wheels.
The get-pip.py script is supported on the same python version as pip. For the now unsupported Python 3.2, an alternate script is available here.
- If set, don’t attempt to install setuptools
- If set, don’t attempt to install wheel
get-pip.py supports using the pip install options and the general options. Below are some examples:
Install from local copies of pip and setuptools:
python get-pip.py --no-index --find-links=/local/copies
Install to the user site :
python get-pip.py --user
Install behind a proxy:
python get-pip.py --proxy="[user:passwd@]proxy.server:port"
Using Linux Package Managers
See Installing pip/setuptools/wheel with Linux Package Managers in the Python Packaging User Guide.
On Linux or macOS:
pip install -U pip
On Windows :
pip install -U pip
Python and OS Compatibility
pip works with CPython versions 2.6, 2.7, 3.3, 3.4, 3.5 and also pypy.
This means pip works on the latest patch version of each of these minor versions (i.e. 2.6.9 for 2.6, etc). Previous patch versions are supported on a best effort approach.
pip works on Unix/Linux, macOS, and Windows.