python类的内建方法

研究email源码学到的

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class test():     """Class for generating text/* type MIME documents."""       def __init__(self):         self._headers = []       def __getitem__(self, name, failobj=None):         name = name.lower()         for k, v in self._headers:             if k.lower() == name:                 return v         return failobj       def __setitem__(self, name, val):         self._headers.append((name, val))       def __str__(self):         """Return the entire formatted message as a string.         This includes the headers, body, and envelope header.         """         return self.as_string()       def as_string(self):         return self._headers   test1=test() test1['1']=2 print test1.as_string()