Python List Comprehension Setting Local Variable -

i having trouble list comprehension in python

basically have code looks this

output = [] i, num in enumerate(test):     loss_ =     test_ = else     output.append(sum(loss_*test_)/float(sum(loss_))) 

how can write using list comprehension such as:

[sum(loss_*test_)/float(sum(loss_))) i, num in enumerate(test)] 

however don't know how assign values of loss_ , test_

you can use nested list comprehension define values:

output = [sum(loss_*test_)/float(sum(loss_))            loss_, test_ in ((do something, else)                                 i, num in enumerate(test))] 

of course, whether that's more readable question.