numpy.find_common_type(array_types, scalar_types)

class numpy.format_parser(formats, names, titles, aligned=False, byteorder=None)

numpy.issubdtype(arg1, arg2)

numpy.promote_types(type1, type2) Returns the data type with the smallest size and smallest scalar kind to which both type1

class numpy.MachAr(float_conv=, int_conv=, float_to_float=, float_to_str= at 0x49c2ce2c>, title='Python floating point number')

numpy.mintypecode(typechars, typeset='GDFgdf', default='d')

numpy.sctype2char(sctype)

class numpy.dtype

numpy.common_type(*arrays)

numpy.can_cast(from, totype, casting = 'safe') Returns True if cast between data types can occur according to the casting rule