求助大佬们 说我标识符字符无效 请问怎么处理

all_raw_code = ['0','1','2','3','4','5','6','7','8'，'9','a','b','c','d','e','f','g']
my_code = []
for i in range(4):
gen_code = all_raw_code[random.randint(0,len(all_raw_code-1)]
my_code.append(gen_code)
print('我的提取码为：',''.join(my_code))