a tip calculator in python

.bash_profile

alias tippy='python ~/path/to/this/thing/tip.py -s'

tip.py

import sys,getopt,time

def main():
    try:
        opts ,args = getopt.getopt(sys.argv[1:], "s:", ["subtotal="])
    except getopt.GetoptError, err:
        print str(err)
        print "bad usage"
        exit(1)

    subtotal=0;

    for o,a in opts:
        if o in ("-s", "--subtotal"):
            subtotal  = float(a)
        else:
            assert False, "unrecognized option"
    
    print "subtotal                  %f" % subtotal
    withTax = subtotal*1.08875
    print "with tax                  %f" % withTax
    print "with tax and 10%% tip      %f" % (withTax + (subtotal*0.1))
    print "with tax and 15%% tip      %f" % (withTax + (subtotal*0.15))
    print "with tax and 20%% tip      %f" % (withTax + (subtotal*0.2))
    print "with tax and five dollars %f" % (withTax + 5)

if __name__ == "__main__":
    main()