Calculate the ratio of ingredients needed for the perfect quantity of pizza dough

pizza.py

#!/usr/bin/env python

# Calculate the ratio of ingredients needed for the perfect quantity of pizza dough
#
# $ pizza.py --target-oz=49
# target: 49.00oz 1389gram
# flour: 800 grams (400 x 2)
# water: 520 grams
# salt: 16 grams
# sugar: 12 grams
# oil: 40 grams
# yeast: 12 grams

import tornado.options
from decimal import Decimal

if __name__ == "__main__":
    tornado.options.define("target_gram", type=Decimal, default=None)
    tornado.options.define("target_oz", type=Decimal, default=None)
    tornado.options.define("hydration", type=Decimal, default=Decimal(".65"))
    tornado.options.options.parse_command_line()
    o = tornado.options.options
    
    gram_per_oz = Decimal("28.349523125")
    
    if o.target_gram:
        target = o.target_gram
        target_oz = o.target_gram / gram_per_oz
    else:
        target = o.target_oz * gram_per_oz
        target_oz = o.target_oz
    
    print "target: %0.2foz %dgram" % (target_oz, target)
    
    salt = Decimal(".02")
    sugar = Decimal(".015")
    flour = Decimal("1")
    yeast = Decimal(".015") 
    oil = Decimal(".05") 
    water = tornado.options.options.hydration
    base = flour + water + oil + salt + sugar
    scale = target / base
    cup_of_flour=Decimal("120")

    print "flour: %d grams (%dg x 2) (%0.1f cups)" % (flour * scale, flour * scale * Decimal(".5"), (flour * scale) / cup_of_flour)
    print "water: %d grams (%0.1f%% hydration)" % (water * scale, water * 100)
    print "salt: %d grams" % (salt * scale)
    print "sugar: %d grams" % (sugar * scale)
    print "oil: %d grams" % (oil * scale)
    print "yeast: %d grams" % (yeast * scale)