Biased Random Number Generator

Question

I am looking for a random number generator that can be biased. For instance, say I want a random number between 1-5, with the probability being:

1: Comes up 20% of t

Answer 1

I am doing to do the same thing and I found this: http://eli.thegreenplace.net/2010/01/22/weighted-random-generation-in-python/

Seems good enough for the purpose you stated.