Indentation error in while statement

File "mandelplot.py", line 33
    List.append(z)
                 ^
IndentationError—unindent does not match any outer indication level

class Mandel (object):
    def mandelblot(self,c,K,LOOPMAX):
        # return the number of loops that have been diverted to
        List = [ ]
        n = 0
        z = 0.0 + (0.0 * 1j)
        while(n<LOOPMAX and abs(z)<K)US>:
            z=z**2+c
            List.append(z)
            if(n>4):
                List.pop(0)
                equal1 = List[0] - List[4]
                event2 = List[0] - List[3]
                if(abs(val1)<10e-5 or abs(val2)<10e-5):
                    break
            n + = 1
        return n