$ cd Python3.6.3
./configure
make
make test
sudo make install

linuxsagar@Satellite-P755 ~ $ python3
Python 3.6.3 (default, Jan 21 2018, 19:33:32)
[GCC 5.4.0 20160609] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>

$ sudo apt install python3-pip