On 01/09/2013 20:58, Antoon Pardon wrote:
Op 31-08-13 02:09, Steven D'Aprano schreef:
On Fri, 30 Aug 2013 11:32:17 +0100, Fábio Santos wrote:
We really are spoiled for choice here. We can write any of these:
# Option 1
for spam in sequence:
if predicate(spam):
process(spam)
Adding a fourth option:
for spam in sequence if predicate(spam):
process(spam)
saves absolutely nothing except a line and an indent level, neither of
which are in short supply, and gains nothing in readability over Option 1.
So what is the big difference between this situation and the following:
| else:
| if condition:
| whatever
which in python we can write:
| elif condition:
| whatever
So either is seems this was a design mistake or a line and an indent
level can be important enough to allow a combination of controls.
'elif' is for cascading ifs:
if ...:
...
elif ...:
...
elif ...:
...
elif ...:
...
else:
...
Without 'elif' you would be forced to write:
if ...:
...
else:
if ...:
...
else:
if ...:
...
else:
if ...:
...
else:
...
On the other hand, for...if is much less of a problem.
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