make abstract base class for boilerplate Python

[derwiki]

A lot of the features of json2csv.py would be useful in other scripts. It would be nice to make the marginal cost of a new script to be just the transform function -- to work with stdin/out or --input, --output for free.

[derwiki]

options = dict()
for arg in sys.argv[1:]:
try:
key, value = arg.strip().split('=')
key = key[2:].replace('-', '_')
options[key] = value
except ValueError: pass

try:
fin = open(options['infile'], 'r')
except KeyError:
fin = sys.stdin

try:
fout = open(options['outfile'], options.get('write_mode', 'w+'))
except KeyError:
fout = sys.stdout

[derwiki]

Ugh, spacing is awful on that last comment. options is a kludge, it needs replaced with argParser or optionParser -- the fin/fout stuff seems pretty clean though.