Module « numpy »

Classe « format_parser »

Informations générales

Héritage

builtins.object
    format_parser

Définition

class format_parser(builtins.object):

Description _{[extrait de format_parser.__doc__]}

    Class to convert formats, names, titles description to a dtype.

    After constructing the format_parser object, the dtype attribute is
    the converted data-type:
    ``dtype = format_parser(formats, names, titles).dtype``

    Attributes
    ----------
    dtype : dtype
        The converted data-type.

    Parameters
    ----------
    formats : str or list of str
        The format description, either specified as a string with
        comma-separated format descriptions in the form ``'f8, i4, a5'``, or
        a list of format description strings  in the form
        ``['f8', 'i4', 'a5']``.
    names : str or list/tuple of str
        The field names, either specified as a comma-separated string in the
        form ``'col1, col2, col3'``, or as a list or tuple of strings in the
        form ``['col1', 'col2', 'col3']``.
        An empty list can be used, in that case default field names
        ('f0', 'f1', ...) are used.
    titles : sequence
        Sequence of title strings. An empty list can be used to leave titles
        out.
    aligned : bool, optional
        If True, align the fields by padding as the C-compiler would.
        Default is False.
    byteorder : str, optional
        If specified, all the fields will be changed to the
        provided byte-order.  Otherwise, the default byte-order is
        used. For all available string specifiers, see `dtype.newbyteorder`.

    See Also
    --------
    dtype, typename, sctype2char

    Examples
    --------
    >>> np.format_parser(['<f8', '<i4', '<a5'], ['col1', 'col2', 'col3'],
    ...                  ['T1', 'T2', 'T3']).dtype
    dtype([(('T1', 'col1'), '<f8'), (('T2', 'col2'), '<i4'), (('T3', 'col3'), 'S5')])

    `names` and/or `titles` can be empty lists. If `titles` is an empty list,
    titles will simply not appear. If `names` is empty, default field names
    will be used.

    >>> np.format_parser(['f8', 'i4', 'a5'], ['col1', 'col2', 'col3'],
    ...                  []).dtype
    dtype([('col1', '<f8'), ('col2', '<i4'), ('col3', '<S5')])
    >>> np.format_parser(['<f8', '<i4', '<a5'], [], []).dtype
    dtype([('f0', '<f8'), ('f1', '<i4'), ('f2', 'S5')])

    

Constructeur(s)

Signature du constructeur	Description
__init__(self, formats, names, titles, aligned=False, byteorder=None)

Liste des opérateurs

Opérateurs hérités de la classe object

__eq__, __ge__, __gt__, __le__, __lt__, __ne__

Méthodes héritées de la classe object

__delattr__, __dir__, __format__, __getattribute__, __hash__, __init_subclass__, __reduce__, __reduce_ex__, __repr__, __setattr__, __sizeof__, __str__, __subclasshook__