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MultiSided Dice Roller DSL (Python recipe) by Chad Crabtree
ActiveState Code (http://code.activestate.com/recipes/573437/)

Multi-Sided Dice Roller DSL with modifiers. Turns REPL into easy die roller.

Python, 39 lines
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#!/usr/bin/python
print """
pyRepl to DM Helper
    Invocation:
        python -i d20.py
    Usage:
        <N>*d(<S>)+<M>
        N   Number of dice
        S   Number of sides on die
        M   Modifier on die roll
    Example:
        >>> 3*d(6)+12
        17
        >>> 2*d(6,True)+12 #shows individual rolls
        4
        2
        18
"""

from random import choice

class d(object):
    def __init__(self,sides,show_rolls=False):
        self.show=show_rolls;
        self.sides=sides
    def roll(self):
       return choice(range(1,self.sides+1)) 
    def accum(self,rolls):
        accum=0;
        for roll in range(rolls):
            roll=self.roll()
            if self.show: print roll
            accum+=roll
        return accum
    def __rmul__(self,other):
        try:
            return self.accum(int(other))
        except ValueError:
            print "Only multiply by an INTEGER"

I wanted to use the python repl to roll dice easily for me. Typing is faster than mousing everything. I had an inspiration to use operator overloading to make this little DSL. Useful for me. Thought I might share.

Tags: oop