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      1. 如何使用Python在满足两个条件的数组中查找值

        How find values in an array that meet two conditions using Python(如何使用Python在满足两个条件的数组中查找值)

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                  本文介绍了如何使用Python在满足两个条件的数组中查找值的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                  问题描述

                  我有一个数组

                  a=[1,2,3,4,5,6,7,8,9]
                  

                  我想找到满足两个条件的元素 s 的索引,即

                  and I want to find the indices of the element s that meet two conditions i.e.

                  a>3 and a<8
                  ans=[3,4,5,6]
                  a[ans]=[4,5,6,7]
                  

                  我可以使用 numpy.nonzero(a>3)numpy.nonzero(a<8)但不是numpy.nonzero(a>3 and a<8) 给出错误:

                  I can use numpy.nonzero(a>3) or numpy.nonzero(a<8) but not numpy.nonzero(a>3 and a<8) which gives the error:

                  ValueError: The truth value of an array with more than one element is
                  ambiguous. Use a.any() or a.all()
                  

                  当我尝试使用 anyall 时,我得到了同样的错误.是否可以结合两个条件测试来获得答案?

                  When I try to use any or all I get the same error. Is it possible to combine two conditional tests to get the ans?

                  推荐答案

                  numpy.nonzero((a > 3) & (a < 8))
                  

                  &做一个元素方式的布尔值和.

                  & does an element-wise boolean and.

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