Why doesn't Python include non-blocking keyboard input function?

[Christian Gollwitzer]

Am 29.10.16 um 16:32 schrieb BartC:
> I still think a beginner would much prefer something along the lines of
> 'readln a,b,c' (and I still think that's more intuitive).
>
> (The first programming exercises I ever did involved typing in integers
> from the user, and sorting them or working out if they made a triangle
> or whatever.

Yes, and that's exactly why they learn to produce such horrible 
interfaces which do not work for a serious program. Instead, teach them 
how to use the *environment* for I/O. That is, as a beginner put your 
function into a file, e.g.

def is_triangle(a, b, c):
	if abs(a)+abs(b) > abs(c):
		print "Triangle!"
	else:
		print "Not a triangle"

..and then use IPython:

%run triangle.py
 >>> is_triangle(1,1.7, 2)
Triangle!
 >>> is_triangle(1,1.7, 8)
Not a triangle
 >>>

(I know the prog is incomplete, but that's not the point)

This way you can concentrate on the algorithm and leave the I/O thing to 
python. Due to the built-in readline, you can recall previous arguments, 
edit them when you make mistakes, save the result (if there were any), 
.... much more than your readln function can accomplish.

	Christian