from proteus import Model, config
from random import randint

database = 'tryton'
config_file = '/app/.dev/trytond.cfg'

config.set_trytond(database, config_file=config_file)

Stock = Model.get('stock.inventory')
stock, = Stock.find([('state', '=', 'draft')])


for line in stock.lines:
    line.quantity = randint(0, 50)
    line.save()