char_list = [‘A‘,‘B‘,‘A‘,‘C‘,‘B‘,‘A‘]
new_list = []
for char in char_list:
if char_list.count(char) == 1:
new_list.append(char)
if char_list.count(char) > 1 and char not in new_list:
new_list.append(char)
else:
continue
print(new_list)原文：https://blog.51cto.com/13560219/2558546