Python if
Possible Duplicate:
Ternary conditional operator in Python
I want to do the following in python:
while( i < someW && j < someX){
int x = A[i] > B[j]? A[i++]:B[j++];
....
}
Clearly, when either i
or j
hits a limit, the code will break out of the loop. I need the values of i
and j
outside of the loop.
Must I really do
x=0
...
if A[i] > B[j]:
x = A[i]
i+=1
else:
x = B[j]
j+=1
Or does anyone know of a shorter way?
Besides the above, can I get Python to support something similar to
a,b=5,7
x = a > b ? 10 : 11
The most readable way is
x = 10 if a > b else 11
but you can use and
and or
, too:
x = a > b and 10 or 11
The "Zen of Python" says that "readability counts", though, so go for the first way.
Also, the and-or trick will fail if you put a variable instead of 10
and it evaluates to False
.
However, if more than the assignment depends on this condition, it will be more readable to write it as you have:
if A[i] > B[j]:
x = A[i]
i += 1
else:
x = A[j]
j += 1
unless you put i
and j
in a container. But if you show us why you need it, it may well turn out that you don't.
Try this:
x = a > b and 10 or 11
This is a sample of execution:
>>> a,b=5,7
>>> x = a > b and 10 or 11
>>> print x
11
链接地址: http://www.djcxy.com/p/7388.html
上一篇: python? (条件/三元)操作员
下一篇: Python如果