code: def seq(start=0, step=1):
  	
  	def seq(a, d):
  		while 1:
  			yield a
  			a += d
  	return seq(start, step)
docs: An arithmetic sequence generator.  Works with any type with + defined.
  
  	>>> seq(1, 0.25) >> item[:10]
  	[1, 1.25, 1.5, 1.75, 2.0, 2.25, 2.5, 2.75, 3.0, 3.25]