Using if-else statements in comprehension lists like this is great:

a = [1, 0, 1, 0, 1, 0, 1, 0, 1]

b = [i-1 if i > 0 else i+1 for i in a]

b
[0, 1, 0, 1, 0, 1, 0, 1, 0]

also using the enumerations makes possible to use the iterator like:

c = [j for j, item in enumerate(b) if item > 0 ]
c
[1, 3, 5, 7]

but how to add an else statement to a comprehension list with enumeration? i.e. something like

c = [j for j, item in enumerate(b) if item > 0 ELSE ]