How to check if array is not empty?

This question already has an answer here:

How do I check if a list is empty? 25 answers

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with a as a numpy array, use:

if a.size:
   print('array is not empty')

(in Python, objects like [1,2,3] are called lists, not arrays.)

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There's no mention of numpy in the question. If by array you mean list, then if you treat a list as a boolean it will yield True if it has items and False if it's empty.

l = []

if l:
    print "list has items"

if not l:
    print "list is empty"

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if self.table:
    print 'It is not empty'

也没关系

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