Generating "slightly" random values in Python

slight_random_yield.py

#!/usr/bin/env python

from random import randint,choice

def slrgen(start=None,mindelta=0,maxdelta=5,minval=0,maxval=1000):
    if start is not None:
        s = int(start)
    else:
        s = randint(minval,maxval)
    while True:
        yield s
        s += choice([1,-1]) * randint(mindelta,maxdelta)
        s = min(maxval, max(minval, s))

s=slrgen(20,maxval=200,maxdelta=7)
for i in range(20):
    v = s.next()
    print "%5d %s" % (v, "#"*v)