Hello World

[CM]

On Sunday, December 21, 2014 1:45:02 AM UTC-5, Chris Angelico wrote:
> On Sun, Dec 21, 2014 at 5:31 PM, Terry Reedy wrote:
> > Just to be clear, writing to sys.stdout works fine in Idle.
> >>>> import sys; sys.stdout.write('hello ')
> > hello  #2.7
> >
> > In 3.4, the number of chars? bytes? is returned and written also.
> >
> > Whether you mean something different by 'stdout' or not, I am not sure.  The
> > error is from writing to a non-existent file descriptor.
> 
> That's because sys.stdout is replaced. But stdout itself, file
> descriptor 1, is not available:
> 
> >>> os.fdopen(1,"w").write("Hello, world\n")
> Traceback (most recent call last):
>   File "<pyshell#4>", line 1, in <module>
>     os.fdopen(1,"w").write("Hello, world\n")
> OSError: [Errno 9] Bad file descriptor
> 
> This works fine in command-line Python, just not in IDLE. It's not
> Windows vs Unix, it's Idle vs terminal.
> 
> ChrisA

Yes, just tested it on the same machine in the terminal and it prints:

Hello, world!
13

Not sure what the 13 is all about. Thanks.