把它翻译成python？ [英] Translate this to python?
问题描述
我正在移植从C ++到python的路由。
有一个复杂的for循环，我不知道如何在python中编码
for（i = nPoints-1，j = 0; j< nPoints; i = j，j ++）
谢谢。
> for（i = nPoints-1，j = 0; j< nPoints; i = j，j ++）
这个的简单翻译是：
i = npoints-1
$ b $范围内的j（npoints）：
......（您的代码在这里）
i = j
HTH，
Pat
> for（i = nPoints-1，j = 0; j< nPoints; i = j，j ++）
或者，如果你不喜欢我和i的初始设置将
更喜欢你在循环顶部的设置代码：
范围内的j（npoints）：
i =（ j-1）％npoints
...（你的代码在这里）
最后，你总是可以这样做：
pointrange = range（npoints）
for i，j in zip（pointrange [-1：] + pointrange [： - 1]，pointrange）：
...（你的代码在这里）
如果你在普通的
基础上重复使用这个范围，后者可能会很有用 - - 实际上你可以存储一个旋转点范围。还有一个
点范围。
HTH，
Pat
KraftDiner写道：我正在移植从C ++到python的路由。
有一个复杂的for循环，我不知道如何编码在python
for（i = nPoints-1，j = 0; j< nPoints; i = j，j ++）
i = nPoints - 1
j = 0
而j < nPoints：
＃做东西
i = j
j + = 1
对于C中的循环并不是很复杂。在进入循环之前，它们会发生在
之前发生的事情，在每次传递之前发生在循环顶部的测试
，以及在结束时发生的事情。身体执行后循环只是
。在Python中使用while循环使得
机械翻译任何这样的C for循环...
-Peter
I''m porting a routing from C++ to python.
There is a complex for loop that I don''t know how to code in python
for (i = nPoints-1, j = 0; j < nPoints; i = j, j++)
Thanks.
> for (i = nPoints-1, j = 0; j < nPoints; i = j, j++)
A simple translation of this would be:
i = npoints-1
for j in range(npoints):
... (your code here)
i = j
HTH,
Pat
> for (i = nPoints-1, j = 0; j < nPoints; i = j, j++)
Alternatively, if you don''t like the initial setup of i and would
prefer your setup code at the top of the loop:
for j in range(npoints):
i = (j-1) % npoints
... (your code here)
Finally, you could always do something like this:
pointrange = range(npoints)
for i,j in zip(pointrange[-1:]+pointrange[:-1], pointrange):
... (your code here)
This latter could be useful if you are reusing the range on a regular
basis -- in fact you could store a "rotatedpointrange" as well as a
point range.
HTH,
Pat
KraftDiner wrote:I''m porting a routing from C++ to python.
There is a complex for loop that I don''t know how to code in python
for (i = nPoints-1, j = 0; j < nPoints; i = j, j++)
i = nPoints - 1
j = 0
while j < nPoints:
# do stuff
i = j
j += 1
For loops in C aren''t really complicated. They have stuff that happens
before the loop is entered, a test that occurs at the top of the loop
before each pass, and stuff that happens at the end of the loop just
after the body has executed. Using a while loop in Python makes it
mechanical to translate any such C for loop...
-Peter
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