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

在判断多元素数组是否为空时，报了这个错

if a:# a是含有多个元素的numpy数组xxx

python报错：

ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()含有多个元素的数组在判断比较所有元素时，要用以上给定的any()或all()方法

参考解决方案：学习随笔-ValueError: The truth value of an array with more than one element is ambiguous