How to download pip module using python program?

Question

Python

I have been making python programs with a huge number of pip modules for different functions.
if the user of my program has not downloaded the module, but it is necessary for the robots, then how can I write a program that will install the module only if it is not installed?

Answer 1

Just put all the modules you use in requirements.txt and ask them to be installed
pip install -r requirements.txt

Answer 2

import pip

def import_or_install(package):
    try:
        __import__(package)
    except ImportError:
        pip.main(['install', package])

Or via subprocess