03-requirements.py

"""How to use Python dependencies with rx.

This script imports two packages: absl and art. If you take a look at
requirements.txt in this repository, you'll see that it defines `absl-py`
(which makes "absl" available), but not the `art` package.

Try running this script with rx:

    $ rx python 03-requirements.py 'more cowbell'

This will print a ModuleNotFoundError, because `art` isn't found.

rx uses your requirements.txt to figure out which packages to install on the
remote machine. Thus, to install the `art` package remotely, open up
requirements.txt (locally) and add a line:

art==5.8

Then save requirements.txt and go back to the command line. Try running this
script again and now rx has all of the packages it needs:

    $ rx python 03-requirements.py 'more cowbell'
                                                           _            _  _
     _ __ ___    ___   _ __   ___    ___   ___  __      __| |__    ___ | || |
    | '_ ` _ \  / _ \ | '__| / _ \  / __| / _ \ \ \ /\ / /| '_ \  / _ \| || |
    | | | | | || (_) || |   |  __/ | (__ | (_) | \ V  V / | |_) ||  __/| || |
    |_| |_| |_| \___/ |_|    \___|  \___| \___/   \_/\_/  |_.__/  \___||_||_|

Note that you did not even need to install the package locally: rx took care of
installing packages based on the contents of requirements.txt.
"""

from absl import app
import art

def main(argv):
  if len(argv) < 2:
    print('You must pass in a string to print.')
    return
  art.tprint(' '.join(argv[1:]))

if __name__ == '__main__':
  app.run(main)