numerictypes.py 文件源码

def sctype2char(sctype):
    """
    Return the string representation of a scalar dtype.

    Parameters
    ----------
    sctype : scalar dtype or object
        If a scalar dtype, the corresponding string character is
        returned. If an object, `sctype2char` tries to infer its scalar type
        and then return the corresponding string character.

    Returns
    -------
    typechar : str
        The string character corresponding to the scalar type.

    Raises
    ------
    ValueError
        If `sctype` is an object for which the type can not be inferred.

    See Also
    --------
    obj2sctype, issctype, issubsctype, mintypecode

    Examples
    --------
    >>> for sctype in [np.int32, np.float, np.complex, np.string_, np.ndarray]:
    ...     print np.sctype2char(sctype)
    l
    d
    D
    S
    O

    >>> x = np.array([1., 2-1.j])
    >>> np.sctype2char(x)
    'D'
    >>> np.sctype2char(list)
    'O'

    """
    sctype = obj2sctype(sctype)
    if sctype is None:
        raise ValueError("unrecognized type")
    return _sctype2char_dict[sctype]

# Create dictionary of casting functions that wrap sequences
# indexed by type or type character