Pip Install -r continue past installs that fail

Question

I am installing a list of packages with pip-python using the command

pip install -r requirements.txt 

sometimes it fails installing packages for whatever reason. Is it possible to have it continue the the next package even with these failures?

Answer 1

I have the same problem. continuing on the line of @Greg Haskins, maybe this bash one-liner is more succinct:

cat requirements.txt | while read PACKAGE; do pip install "$PACKAGE"; done  # TODO: extend to make the script print a list of failed installs, # so we can retry them. 

(for the non-shellscripters: it calls pip install for each of the listed packages)

the same note on the dependancies failure applies of course here!

Answer 2

You could write a little wrapper script to call pip iteratively, something like:

#!/usr/bin/env python """ pipreqs.py: run ``pip install`` iteratively over a requirements file. """ def main(argv):     try:         filename = argv.pop(0)     except IndexError:         print("usage: pipreqs.py REQ_FILE [PIP_ARGS]")     else:         import pip         retcode = 0         with open(filename, 'r') as f:             for line in f:                 pipcode = pip.main(['install', line.strip()] + argv)                 retcode = retcode or pipcode         return retcode if __name__ == '__main__':     import sys     sys.exit(main(sys.argv[1:])) 

which you could call like pipreqs.py requirements.txt --some --other --pip --args.

Note that this only applies the "continue despite failure" motto one level deep---if pip can't install a sub-requirement of something listed, then of course the parent requirement will still fail.