使用正则表达式判断密码强弱

def password_level(password):
 weak = re.compile(r'^((\d+)|([A-Za-z]+)|(\W+))$')
 level_weak = weak.match(password)
 level_middle = re.match(r'([0-9]+(\W+|\_+|[A-Za-z]+))+|([A-Za-z]+(\W+|\_+|\d+))+|((\W+|\_+)+(\d+|\w+))+',password)
 level_strong = re.match(r'(\w+|\W+)+',password)
 if level_weak:
  print 'password level is weak',level_weak.group()
 else:
  if (level_middle and len(level_middle.group())==len(password)):
   print 'password level is middle',level_middle.group()
  else:
   if level_strong and len(level_strong.group())==len(password):
    print 'password level is strong',level_strong.group()

if __name__ == '__main__':
 passwords = ('11','aa','LL','1a','1_','a_','a1','_1','*a','1a_','1a<')
 for pw in passwords:
  password_level(pw)
'''----------------------output------------------------
#password level is weak 11
#password level is weak aa
#password level is weak LL
#password level is middle 1a
#password level is middle 1_
#password level is middle a_
#password level is middle a1
#password level is middle _1
#password level is middle *a
#password level is strong 1a_
#password level is strong 1a<
'''