Web Reference: Jul 23, 2025 · ValueError: setting an array element with a sequence. Solution: Use dtype=object to allow arrays of nested lists with different lengths, or pad the nested lists to equal lengths before creating the array. A numpy array is being created, and numpy doesn't know how to cram multivalued tuples or arrays into single element slots. It expects whatever you give it to evaluate to a single number, if it doesn't, Numpy responds that it doesn't know how to set an array element with a sequence. In this guide, we'll explain why this error happens, demonstrate the common scenarios that trigger it, and walk through multiple solutions to fix it. Why Does This Error Occur? In Python, boolean evaluation expects a single True or False result.
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