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Undefined behaviour in C [was Re: The Cost of Dynamism]

Rustom Mody rustompmody at gmail.com
Sun Mar 27 01:02:18 EDT 2016 
On Sunday, March 27, 2016 at 2:15:22 AM UTC+5:30, Terry Reedy wrote:
> On 3/26/2016 1:43 PM, Rustom Mody wrote:
> 
> > There is this nice piece of OO called the exception hierarchy:
> 
>  > https://docs.python.org/2/library/exceptions.html#exception-hierarchy
> 
> https://docs.python.org/3/library/exceptions.html#exception-hierarchy
> 
> > BaseException ⊇ Exception ⊇ EnvironmentError ⊇ IOError
> 
> BaseException ⊇ Exception ⊇ ⊇ OSError
> 
> > At this point it would have been completely natural for IOError to continue
> > subclassing to all the typical errors
> > - File not found
> > - No Space left on device
> 
> Which is why we now have
> 
>        +-- OSError
>        |    +-- BlockingIOError
>        |    +-- ChildProcessError
>        |    +-- ConnectionError
>        |    |    +-- BrokenPipeError
>        |    |    +-- ConnectionAbortedError
>        |    |    +-- ConnectionRefusedError
>        |    |    +-- ConnectionResetError
>        |    +-- FileExistsError
>        |    +-- FileNotFoundError
>        |    +-- InterruptedError
>        |    +-- IsADirectoryError
>        |    +-- NotADirectoryError
>        |    +-- PermissionError
>        |    +-- ProcessLookupError
>        |    +-- TimeoutError
> 
> 'no space' is MemoryError, but that is a hardward, not OS matter.
> 
> > But instead we have an integer errno and we must inquire what that is to
> > figure out what the exact IOError was
> 
> This statement is obsolete, but explains why the above was added in 3.3.

Thanks Terry for the correction
I had an impression of seeing some discussion on this and resolved not
to incorporate.
Glad to be wrong on that
However my general point is hardly about errno but about the lineage/legacy
of python.
And this is only strengthened by your correction
Thanks to American politics being in the air I learnt a new word the other day:
'birther'.
My point is python is 'birthed' in Unix-land
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