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a = "sdSdsfdAdsdsdfsfdsdASDSDFDSFa"
# 大小写互换
new_a = a.swapcase()

# 镜像字符串

str_image = ""# 镜像后的字符串
str_1 = "abcdefghijklmnopqrstuvwxyz"
str_2 = str_1[::-1] # 小写字母对应镜像字符串

for i in new_a:
    if i.islower():
        str_image += str_2[str_1.find(i)]
    else:
        str_image += str_2[str_1.find(i.lower())].upper()
print("""大小写互换后：{}
镜像字符串为：{}""".format(new_a,str_image))