How to use 'pandas find rows with nan' in Python

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def find_null(data):
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    """ Finds the indices of all missing values.
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    Parameters
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    ----------
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    data: numpy.ndarray
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        Data to impute.
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    Returns
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    -------
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    List of tuples
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        Indices of all missing values in tuple format; (i, j)
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    """
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    null_xy = np.argwhere(np.isnan(data))
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    return null_xy