每日小题7

a={'AAA':'123','BB':'123','C':'1223','DD':'222','EEE':'123'}
# # # 判断一个字典中是否有这些key： ‘AAA’,’BB’,’C’,’DD’,’EEE’(不使用for while)
b=['AAA','BB','C','DD']

a=set(a)
b=set(b)
print('%s存在'%(a&b))
i=0
c=str(a)
def func(a,i):
    try:
        o=b[i]
        oo=repr(o)+":"
        print(oo)
        print(c)
        if oo in a:
            print("%s存在"%o)
        i+=1
    except:
        return
    func(a,i)
func(c,i)

from functools import reduce
lst = [[1,2,3],[4,5,6],[7,8,9]]
print(list(reduce(lambda x,y:x+y,lst)))
# print(sum(lst,[]))

#
# 输入一个字符串，返回倒序排列的结果：abcdef，返回：fedcba
a='abcdef'
print(a[::-1])

# 已知alsit = [1, 2, 3, 1, 2, 1, 3]
alsit = [1, 2, 3, 1, 2, 1, 3]
print(set(sorted(alsit,key=alsit.index)))


# 将aaabbcccd这种形式的字符串压缩成a3b2c3d1这种形式。
b={}
c=""
a="aaabbcccd"
for i in a:
    b[i]=b.get(i,0)+1
for i,t in b.items():
    c+=str(i)
    c+=str(t)
print(c)