Stop pip from failing on single package when installing with requirements.txt

This solution handles empty lines, whitespace lines, # comment lines, whitespace-then-# comment lines in your requirements.txt.

cat requirements.txt | sed -e '/^\s*#.*$/d' -e '/^\s*$/d' | xargs -n 1 pip install

Hat tip to this answer for the sed magic.

Running each line with pip install may be a workaround.

cat requirements.txt | xargs -n 1 pip install

Note: -a parameter is not available under MacOS, so old cat is more portable.

For windows users, you can use this:

FOR /F %k in (requirements.txt) DO ( if NOT # == %k ( pip install %k ) )

Logic: for every dependency in file(requirements.txt), install them and ignore those start with "#".

For Windows:

pip version >=18

import sys
from pip._internal import main as pip_main

def install(package):
    pip_main(['install', package])

if __name__ == '__main__':
    with open(sys.argv[1]) as f:
        for line in f:
            install(line)

pip version <18

import sys
import pip

def install(package):
    pip.main(['install', package])

if __name__ == '__main__':
    with open(sys.argv[1]) as f:
        for line in f:
            install(line)