Update assignment.py

week03/assignment.py

 def value(v,pos=4,neg=3):
         sign = -1 if [0] == 1 else 1
         return sign * sum([v[i] * 2 ** (pos - i) for i in range(1, pos+neg+1)])
-def values(v, pos, neg):
+def values(v, pos=4, neg=3):
     ang= list(map(int,v))
     sign = -1 if ang[0] == 1 else 1
     return sign * sum([ang[i] * 2 ** (pos - i) for i in range(1, pos + neg + 1)])