Le 08/10/2011 14:41, Alain Ketterlin a écrit :
Operators like "not in" and "is not" should
really be considered single tokens, even though they seem to use "not".
And I think they are really convenient.
I realize that I was confused by the lexical form of the "not in"
operator : it is made by juxtaposing two other operators. Operators
composed from two other operators exist, for instance != but the two
cannot be separated, for instance
2 ! = 3
is not a valid expression. Said in another way, in Python syntax,
usually a "lexically juxtaposed operator" is seen as a whole. This is
not the case for an operator such as "is not" or "not in" because for
example
>>> 2 is not 3
is a valid statement.
A notin operator or isnot operator would be less confusing (at least in
my case ;) ).
--
http://mail.python.org/mailman/listinfo/python-list
