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  1. #!/usr/bin/env python
  2. # -*- coding:utf-8 -*-
  3.  
  4.  
  5. class Cstr(str):
  6. _add = "egg"
  7.  
  8. def __new__(cls, s):
  9. return str.__new__(cls,
  10. " ".join([s, cls._add]))
  11.  
  12. if __name__ == "__main__":
  13. s = Cstr("spam")
  14. print s
Not running #stdin #stdout 0s 0KB
stdin
Standard input is empty
stdout
Standard output is empty