python 3.6

def recursive_len(xs): Given a list xs , write a function to calculate its length recursively. (Yes, this is a bit silly/wasteful, but it's a simple start for recursion). Each time the list isn't empty, its length can be found as one plus the length of all but the first item

Assume: xs is a list

.Restriction: do not call len()

.Examples:

recursive_len( [1,2,3] )3

recursive_len( [ ] )0

recursive_len( [0,0,0,0] )4