您可以使用字典:
x = 0 y = 1 z = 3 list=[] dict = {0: 'c', 1: 'd', 2: 'e', 3: 'f'} if x in dict: list.append(dict[x]) else: pass if y in dict: list.append(dict[y]) else: pass if z in dict: list.append(dict[z]) else: pass print list