Check if numpy's array_like is an empty array-CodePudding

Suppose a is an array_like and we want to check if it is empty. Two possible ways to accomplish this are:

if not a:
   pass

if numpy.array(a).size == 0:
   pass

The first solution would also evaluate to True if a=None. However I would like to only check for an empty array_like.

The second solution seems good enough for that. I was just wondering if there is a numpy built-in function for that or a better solution then to check for the size?

CodePudding user response：

If you want to check if size is zero, you might use numpy.size function to get more concise code

import numpy
a = []
b = [1,2]
c = [[1,2],[3,4]]
print(numpy.size(a) == 0)  # True
print(numpy.size(b) == 0)  # False
print(numpy.size(c) == 0)  # False