列表理解循环Python [英] List comprehension for loops Python

问题描述

我使用了很多N维数组，不得不编写这样的缩进代码会很痛苦，而且我知道有些代码可以用列表推导和内联语句替换.例如:

I use a lot of N dimensional arrays and it gets a pain to have to write such indented code and I know some codes can be replaced with list comprehensions and inline statements. For example:

for x in (0,1,2,3):
    for y in (0,1,2,3):
        if x < y:
            print (x, y, x*y)

可以替换为:

print [(x, y, x * y) for x in (0,1,2,3) for y in (0,1,2,3) if x < y]

但是我该如何更改操作而不是打印来进行其他操作:

But how could I change the action instead of print to do something else like:

total = x+y

所以我想做的事情是这样的:

So what I want to do is something like:

[(total+=x+y) for x in (0,1,2,3) for y in (0,1,2,3) if x < y]

但是这不起作用

是否有一个聪明的方法来做到这一点，而不是:

Is there a smart way to do this rather than:

for x in (0,1,2,3):
        for y in (0,1,2,3):
            if x < y:
                total+=x+y

推荐答案

sum在这里工作:

total = sum(x+y for x in (0,1,2,3) for y in (0,1,2,3) if x < y)

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