--see here:
--https://www.mssqltips.com/sqlservertip/5148/populate-large-tables-with-random-data-for-sql-server-performance-testing/
>>> import random
>>> random.randrange(0, 0)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/Users/mj/Development/Libraries/buildout.python/parts/opt/lib/python2.7/random.py", line 217, in randrange
raise ValueError, "empty range for randrange() (%d,%d, %d)" % (istart, istop, width)
ValueError: empty range for randrange() (0,0, 0)