When I run !pip install geocoder in Jupyter Notebook I get the same output as running pip install geocoder in the terminal but the geocoder package
!pip install geocoder
pip install geocoder
%pip install fedex #fedex = package name
in 2019.
In older versions of conda:
import sys !{sys.executable} -m pip install fedex #fedex = package name
*note - you do need to import sys