什么是Python的Java相当于Java的标准for循环? [英] What is Python's equivalent of Java's standard for-loop?
问题描述
for(int i = 3; i< Math.sqrt(n); i + = 2){
if(n%i == 0)
返回false;
$ / code $
所以我一直在尝试使用这个,但我很明显跳过除3:
i = 3
while(i i + = 2#我把这个放在哪里?
if(n%i == 0):
return False
在Python中, -loop中唯一的在技术上是for-each,所以你可以使用(3,int(math.sqrt(n)),就像
2):#在Python 3中使用'range'
if n == i == 0:
return False
当然,Python可以做的比这更好:
$ b
all (3,int(math.sqrt(n)),2))
也是等价的(假设在Java循环结束时有一个 return true
)。事实上,后者将被认为是pythonic方法。
参考:
I'm writing a simple algorithm to check the primality of an integer and I'm having a problem translating this Java code into Python:
for (int i = 3; i < Math.sqrt(n); i += 2) {
if (n % i == 0)
return false;
}
So, I've been trying to use this, but I'm obviously skipping the division by 3:
i = 3
while (i < int(math.sqrt(n))):
i += 2 # where do I put this?
if (n % i == 0):
return False
The only for
-loop in Python is technically a "for-each", so you can use something like
for i in xrange(3, int(math.sqrt(n)), 2): # use 'range' in Python 3
if n % i == 0:
return False
Of course, Python can do better than that:
all(n % i for i in xrange(3, int(math.sqrt(n)), 2))
would be equivalent as well (assuming there's a return true
at the end of that Java loop). Indeed, the latter would be considered the Pythonic way to approach it.
Reference:
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