ValueError: Setting an Array Element with a Sequence: Why Does This Happen in NumPy?

ValueError: Setting an Array Element with a Sequence

Why do the following code samples give the error "ValueError: setting an array element with a sequence?":

np.array([[1, 2], [2, 3, 4]])
np.array([1.2, "abc"], dtype=float)

Possible Reason 1: Jagged Arrays

You may be trying to create a "jagged array", where the number of elements in each sublist varies. NumPy does not support this:

np.array([[1, 2], [2, 3, 4]]) # error

The inner lists must have the same length to form a multidimensional array.

Possible Reason 2: Incompatible Types

You may be providing elements of incompatible types to the array. For example, trying to include a string in an array of floats:

np.array([1.2, "abc"], dtype=float) # error

If necessary, you can use the dtype=object option to create an array that holds arbitrary Python objects:

np.array([1.2, "abc"], dtype=object)

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