#2 判断一个字符串是否包含重复字符

 1 #!/Users/minutesheep/.pyenv/shims/python
 2 # -*- coding: utf-8 -*-
 3 
 4 
 5 def isDup(strs):
 6     '''
 7     判断字符串是否有重复字符
 8     '''
 9     for ch in strs:
10     ¦   counts = strs.count(ch)
11     ¦   if counts > 1:
12     ¦   ¦   return True
13     return False
14 
15 
16 if __name__ == '__main__':
17     strs = 'Good'
18     result = isDup(strs)
19     print(strs + '有重复字符') if result else print(strs + '没有重复字符')

Good有重复字符