It is always good to see that the batteries included in Rocket Python actually work…

Here is an example on how to compress a MVS file into a zip file:

from zipfile import ZipFile

zf = 'mm.zip'
fn = '//MM.PRINTS'

fz = fn.lstrip('/') # remove '/' from the MVS file name

with open(fn, 'r') as fd:
    qstr = fd.read()
    with ZipFile(zf, 'w') as zd:
        # zd.write(fn,fz) <- does not work because internally called
        #                    os.stat() does not find z/OS dataset
        zd.writestr(fz, qstr)
        print zd.printdir()

This runs in Python 2.7.13, File must fit into 64 bit memory.