Python基础字典-同字母异次序

arr = ['cat', 'dog', 'tac', 'god', 'act']
# 结果 [['cat', 'tac', 'act'], ['dog', 'god']]
d = {}
for i in arr:
    # 1、字符串排序
    a = list(i)
    a.sort()
    print(a)
    # 2、列表转元组写入字典
    b = tuple(a)
    if b not in d.keys():
        d[b] = [i]
    else:
        d[b].append(i)
print(list(d.values()))