`numpy:asarray_chkfinite`

Signature

def asarray_chkfinite(a, dtype = None, order = None)

Convert the input to an array, checking for NaNs or Infs.

a : array_like: Input data, in any form that can be converted to an array. This includes lists, lists of tuples, tuples, tuples of tuples, tuples of lists and ndarrays. Success requires no NaNs or Infs.
dtype : data-type, optional: By default, the data-type is inferred from the input data.
order : {'C', 'F', 'A', 'K'}, optional: The memory layout of the output. 'C' gives a row-major layout (C-style), 'F' gives a column-major layout (Fortran-style). 'C' and 'F' will copy if needed to ensure the output format. 'A' (any) is equivalent to 'F' if input a is non-contiguous or Fortran-contiguous, otherwise, it is equivalent to 'C'. Unlike 'C' or 'F', 'A' does not ensure that the result is contiguous. 'K' (keep) preserves the input order for the output. 'C' is the default.

out : ndarray: Array interpretation of a. No copy is performed if the input is already an ndarray. If a is a subclass of ndarray, a base class ndarray is returned.

: ValueError: Raises ValueError if a contains NaN (Not a Number) or Inf (Infinity).

import numpy as np

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Convert a list into an array. If all elements are finite, then ``asarray_chkfinite`` is identical to ``asarray``.

a = [1, 2]
np.asarray_chkfinite(a, dtype=float)

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array([1., 2.])

Raises ValueError if array_like contains Nans or Infs.

a = [1, 2, np.inf]
try:
    np.asarray_chkfinite(a)
except ValueError:
    print('ValueError')

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ValueError