What is a backing store in the context of module iohttps://docs.python.org/3/library/io.html

[Veek M]

On Mon, 11 Nov 2019 16:08:12 +0000, Veek M wrote:

> So i was making some notes and: https://i.imgur.com/UATAKXh.png
> 
> I did not understand this
> 
> https://docs.python.org/3/library/io.html 'Text I/O expects and produces
> str objects. This means that whenever the backing store is natively made
> of bytes (such as in the case of a file),
> encoding and decoding of data is made transparently as well as optional
> translation of platform-specific newline characters.'
> 
> 1. What is a backing store?
> 2. How does it fit in/influence what we pass to the fileObject/stream/
> filelikeObject.method()
> 

I was reading pydoc io and - how do I decipher the indentation?

    _io._BufferedIOBase(_io._IOBase)
        _io.BufferedRWPair
        _io.BufferedRandom  #are these Derived Classes of BufferedIOBase?
        _io.BufferedReader
        _io.BufferedWriter
        _io.BytesIO
        BufferedIOBase(_io._BufferedIOBase, IOBase) #huh??
    _io._IOBase(__builtin__.object)
        IOBase #huh???
            BufferedIOBase(_io._BufferedIOBase, IOBase)
            RawIOBase(_io._RawIOBase, IOBase)
            TextIOBase(_io._TextIOBase, IOBase)
    _io._RawIOBase(_io._IOBase)
        _io.FileIO
        RawIOBase(_io._RawIOBase, IOBase)
    _io._TextIOBase(_io._IOBase)
        _io.StringIO
        _io.TextIOWrapper
        TextIOBase(_io._TextIOBase, IOBase)