出错点

1、High order functions calculate letter case

Using the addition between strings

2、iterable Object needs to convert (list) output  

map-->map object (list or tuple(map))

range() -->range (list or tuple(range))

fiter()------>fiter object (list or tuple(fiter))

 (i for ...) ---> generater  object (list or tuple())

3、re

https://www.cnblogs.com/panwenbin-logs/p/5584864.html

print('------------')
print((re.search('(?=.*[a-z])(?=.*[0-9])(?=.*[A-Z])^([A-Z0-9a-z]){6,}$','123abA44').group()))
# search and findall
print((re.findall('(?=.*[a-z])(?=.*[0-9])(?=.*[A-Z])^([A-Z0-9a-z]){6,}$','123abA44')))

print((re.search('(?=.*[A-Z0-9a-z])^([A-Z0-9a-z]){6,}$','124sf4AASF564').group()))