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

() to determine the truth value of an array.

When we have an array with more than one element, we cannot determine its truth value just by looking at it. This is because the array may contain both true and false values, making it unclear whether the overall truth value of the array is true or false.

To determine the truth value of an array, we can use the any() or all() methods. The any() method returns True if at least one element in the array is True, while the all() method returns True only if all elements in the array are True.

For example, consider the following array:

a = [True, False, True]

The truth value of this array is ambiguous, since it contains both True and False values. To determine its truth value, we can use the any() or all() methods:

>>> a.any()
True
>>> a.all()
False

In this case, the any() method returns True because there is at least one True value in the array. The all() method returns False because not all values in the array are True.