[Tutor] this group and one liners

[Dennis Lee Bieber]

On Thu, 7 Jul 2022 18:01:13 -0400, <avi.e.gross at gmail.com> declaimed the
following:


>
>max([] or 0) 
>
> 
>
>breaks down with an error and the [] does not evaluate to false.
>

	That's because the 0 is not an iterable, not that [] didn't evaluate...

>>> [] or 0
0
>>> max([] or 0)
Traceback (most recent call last):
  File "<interactive input>", line 1, in <module>
TypeError: 'int' object is not iterable
>>> max(0)
Traceback (most recent call last):
  File "<interactive input>", line 1, in <module>
TypeError: 'int' object is not iterable
>>> 

	max() requires something it can iterate over. The expression

	<something falsey> or <anything>

returns <anything>, not true/false, and does NOT override max() normal
operation of trying to compare objects in an iterable..

>>> 
>>> [] or "anything"
'anything'
>>> max([] or "anything")
'y'
>>> 

	The "default" value option applies only if max() would otherwise raise
an exception for an empty sequence.

>>> max([], default=0)
0
>>> max([])
Traceback (most recent call last):
  File "<interactive input>", line 1, in <module>
ValueError: max() arg is an empty sequence
>>> 



-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
	wlfraed at ix.netcom.com    http://wlfraed.microdiversity.freeddns.org/