how to install python pip ???
You can’t install PIP and PyPI packages directly on Endless OS, because the OS cannot be modified except for updates. However, you could use a Python virtual environment such as virtualenv, and a more sophisticated one like Anaconda would probably work too (I haven’t tried though.)
You can also use PIP while developing inside a Flatpak sandbox; follow the instructions on https://flatpak.org/runtimes#gnome to install the GNOME SDK, or on http://endlessm.github.io/eos-knowledge-lib/contributing to install the Endless SDK. Then you can enter a sandbox with flatpak run --command=bash org.gnome.Sdk or flatpak run --command=bash com.endlessm.apps.Sdk.