numerictypes.py 文件源码

def bitname(obj):
    """Return a bit-width name for a given type object"""
    name = obj.__name__
    base = ''
    char = ''
    try:
        if name[-1] == '_':
            newname = name[:-1]
        else:
            newname = name
        info = typeinfo[english_upper(newname)]
        assert(info[-1] == obj)  # sanity check
        bits = info[2]

    except KeyError:     # bit-width name
        base, bits = _evalname(name)
        char = base[0]

    if name == 'bool_':
        char = 'b'
        base = 'bool'
    elif name == 'void':
        char = 'V'
        base = 'void'
    elif name == 'object_':
        char = 'O'
        base = 'object'
        bits = 0
    elif name == 'datetime64':
        char = 'M'
    elif name == 'timedelta64':
        char = 'm'

    if sys.version_info[0] >= 3:
        if name == 'bytes_':
            char = 'S'
            base = 'bytes'
        elif name == 'str_':
            char = 'U'
            base = 'str'
    else:
        if name == 'string_':
            char = 'S'
            base = 'string'
        elif name == 'unicode_':
            char = 'U'
            base = 'unicode'

    bytes = bits // 8

    if char != '' and bytes != 0:
        char = "%s%d" % (char, bytes)

    return base, bits, char