lambda and if

[matt]

say you had the following

filenames = map(lambda x:x[2] + "_" + x[0] + "_" + x[1] + ".txt" ,items)

but really wanted
filenames = map(lambda x:x[2] + "_" + x[0] + "_" + (x[1] in ("big",) ? "big" :
"") + ".txt" ,items)

where (x[1] in ('big',) ? "big" : "") is a pseudo c++_pyhton expression that I
want to implement .....

i.e. the result is to append "big" to the filename being created if it is the
2nd element of item, otherwise don't append anything.

regards
Matt