convert loop to list comprehension

[Steve Holden]

bvdp at xplornet.com wrote:
[...]
> 
> Cool ... and damn but you guys are fast with the answers. This appears
> to work find, but in a quick and dirty test it appears that the [list]
> version takes about 2x as long to run as the original loop. Is this
> normal?
> 
No hard and fast information, but as a general rue of thumb replacing 
calls to a c function like list.extend() with iteration inside a list 
comprehension is very likely to be slower.

regards
  Steve
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