Easy questions from a python beginner

[Dave Angel]

wheres pythonmonks wrote:
> Funny... just spent some time with timeit:
>
> I wonder why I am passing in strings if the callback overhead is so light...
>
> More funny:  it looks like inline (not passed in) lambdas can cause
> python to be more efficient!
>   
>>>> import random
>>>> d = (['A','B'][random.randint(0,1)],x,random.gauss(0,1)) for x in xrange(0,1000000) ]
>>>> def A1(): j = lambda t: (t[2]*t[1],t[2]**2+5) for t in d ]
>>>>         
>
>   
>>>> def A2(): j = (t[2]*t[1],t[2]**2+5) for t in d ]
>>>>         
>
>   
But A1() gives a different result.  It builds a list of function 
objects.  It doesn't actually do any of  those multiplies.  In fact, I 
don't even think it would get the same answers if you then looped 
through it, calling the functions it stored.

DaveA