Make an object a "character buffer object"

I have a custom class, which has s开发者_运维百科ome string data. I wish to be able to save this string data to a file, using a file handle's write object. I have implemented __str__(), so i can do str(myobject), what is the equivalent method for making python consider my object to be a character buffer object?

If you are trying to use your object with library code, that expects to be able to write what you give it to a file, then you may have to resort to implementing a "duck file" class that acts like a file but supports your stringable object. Unfortunately, file is not a type that you can subclass easily, at least as of Python 2.6. You will have to implement enough of the file protocol (write, writelines, tell, etc.) to allow the library code to work as expected.

There isn't a single function, but a whole range of them - read, seek, etc.

Why don't you subclass StringIO.StringIO, which is already a string buffer?