On the eve of posting this to c.l.py, add a response to a common but
nonsensical suggestion (that x == True should hold for all true x).
This commit is contained in:
parent
31b1ea98c7
commit
2fe448c171
13
pep-0285.txt
13
pep-0285.txt
|
@ -203,6 +203,19 @@ Issues
|
|||
for functions and types only. But I'm willing to consider the
|
||||
lowercase alternatives if enough people think it looks better.
|
||||
|
||||
It has been suggested that, in order to satisfy user expectations,
|
||||
for every x that is considered true in a Boolean context, the
|
||||
expression x == True should be true, and likewise if x is
|
||||
considered false, x == False should be true. This is of course
|
||||
impossible; it would mean that e.g. 6 == True and 7 == True, from
|
||||
which one could infer 6 == 7. Similarly, [] == False == None
|
||||
would be true, and one could infer [] == None, which is not the
|
||||
case. I'm not sure where this suggestion came from; it was made
|
||||
several times during the first review period. For truth testing
|
||||
of a value, one should use "if", e.g. "if x: print 'Yes'", not
|
||||
comparison to a truth value; "if x == True: print 'Yes'" is not
|
||||
only wrong, it is also strangely redundant.
|
||||
|
||||
|
||||
Implementation
|
||||
|
||||
|
|
Loading…
Reference in New Issue