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How to fix ValueError: The truth value of an array with zero elements is ambiguous?

Posted on March 13, 2023March 13, 2023 By Luke K

This error typically occurs when you are trying to use an empty array as a Boolean condition in an if-statement or a while-loop. The error message is telling you that the truth value of an empty array is ambiguous because there is no value to evaluate.

Here is an example code that can produce this error:

import numpy as np

arr = np.array([])
if arr:
    print("The array is not empty")

In this code, the arr variable is an empty NumPy array. When we try to use arr as a condition in the if-statement, the error occurs because there is no value to evaluate.

See also  How to count number of zeros in Numpy array?

To fix this error, you can check if the length of the array is greater than zero before using it as a Boolean condition:

import numpy as np

arr = np.array([])
if len(arr) > 0:
    print("The array is not empty")

In this code, we first check if the length of the array is greater than zero before using it as a condition in the if-statement. If the length is zero, the condition will evaluate to False and the code inside the if-block will not be executed.

See also  How to solve NameError: name 'numpy' is not defined
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