posixfile.py 文件源码

def fileopen(self, file):
        import types
        if repr(type(file)) != "<type 'file'>":
            raise TypeError, 'posixfile.fileopen() arg must be file object'
        self._file_  = file
        # Copy basic file methods
        for maybemethod in dir(file):
            if not maybemethod.startswith('_'):
                attr = getattr(file, maybemethod)
                if isinstance(attr, types.BuiltinMethodType):
                    setattr(self, maybemethod, attr)
        return self

    #
    # New methods
    #