Python if-else 简写
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Python if-else short-hand
提问by learner
Possible Duplicate:
Ternary conditional operator in Python
可能的重复：
Python 中的三元条件运算符
I want to do the following in python:
我想在 python 中执行以下操作：
while( i < someW && j < someX){
int x = A[i] > B[j]? A[i++]:B[j++];
....
}
Clearly, when either ior jhits a limit, the code will break out of the loop. I need the values of iand joutside of the loop.
显然，当i或j达到限制时，代码将跳出循环。我需要的值i和j循环外。
Must I really do
我真的必须这样做吗
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?
或者有人知道更短的方法吗？
Besides the above, can I get Python to support something similar to
除了上述之外，我可以让 Python 支持类似于
a,b=5,7
x = a > b ? 10 : 11
回答by DonCallisto
Try this:
尝试这个：
x = a > b and 10 or 11
This is a sample of execution:
这是一个执行示例：
>>> a,b=5,7
>>> x = a > b and 10 or 11
>>> print x
11
回答by Lev Levitsky
The most readable way is
最易读的方式是
x = 10 if a > b else 11
but you can use andand or, too:
但你也可以使用andand or：
x = a > b and 10 or 11
The "Zen of Python" says that "readability counts", though, so go for the first way.
不过，“Python 之禅”说“可读性很重要”，所以请选择第一种方式。
Also, the and-or trick will fail if you put a variable instead of 10and it evaluates to False.
此外，如果您放置一个变量而不是10并且它的计算结果为，则 and-or 技巧将失败False。
However, if more than the assignment depends on this condition, it will be more readable to write it as you have:
但是，如果比分配更多地取决于此条件，则按照以下方式编写它会更具可读性：
if A[i] > B[j]:
x = A[i]
i += 1
else:
x = A[j]
j += 1
unless you put iand jin a container. But if you show us why you need it, it may well turn out that you don't.
除非你把i它j放在一个容器里。但是如果你告诉我们你为什么需要它，结果很可能你不需要。
