[Tutor] newB Q: extracting common elements from 2 lists

[Stephen Doughty]

Hi

I've just discovered the tutor list, I'm hoping to
learn a lot more about Python by reading other peoples
querys/answers.

My question:
I'm writing an export script for blender and have
stuck a hitch. I'm trying to work through the problem
in IDLE, so the examples are from the command line.

I have two tuples where the values are lists,
eg :
>>> xmap
{1: [1, 3, 5, 7, 9]}
>>> ymap
{1: [1, 2, 3, 4, 5]}

what I want is to extract the common elements of the
two tuple values and put them in a new tuple 'list'

like:

xymap[1] = xmap[1] *something magic here* ymap[1]

so xymap[1] contains [1,3,5].

can it be done?  - as tuples or converted to lists and
done somehow?

I found that xymap[1] = xmap[1] and ymap[1] just
combined the list rather than binary anding them (and
& caused an error).

Any advice gratefully received.

Cheers Stephen



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