Map each list value to its corresponding percentile

Question

I\'d like to create a function that takes a (sorted) list as its argument and outputs a list containing each element\'s corresponding percentile.

For example,

Answer 1

this might look oversimplyfied but what about this:

def percentile(x):
    pc = float(1)/(len(x)-1)
    return ["%.2f"%(n*pc) for n, i in enumerate(x)]

EDIT:

def percentile(x):
    unique = set(x)
    mapping = {}
    pc = float(1)/(len(unique)-1)
    for n, i in enumerate(unique):
        mapping[i] = "%.2f"%(n*pc)
    return [mapping.get(el) for el in x]