[Python] Método que retorne las apariciones únicas de cada caracter

appear.py

#Romina Cofre 


# Unique appearances of each character
# return: diccionary 
# params: String
def appear(S):
  rep = {} #diccionary
  
  for c in S:
    if c not in rep:
      rep[c] = S.count(c)
      
  return rep
  
#call
S = "abcabb" #string
rep = appear(S)
print (rep)