| can_cast(from, totype, casting = ) | Returns True if cast between data types can occur according to the casting rule. |
| promote_types(type1, type2) | Returns the data type with the smallest size and smallest scalar kind to which both type1 and type2 may be safely cast. |
| min_scalar_type(a) | For scalar a, returns the data type with the smallest size and smallest scalar kind which can hold its value. |
| result_type(*arrays_and_dtypes) | Returns the type that results from applying the NumPy type promotion rules to the arguments. |
| common_type(*arrays) | Return a scalar type which is common to the input arrays. |
| obj2sctype(rep[, default]) | Return the scalar dtype or NumPy equivalent of Python type of an object. |
| dtype | Create a data type object. |
| format_parser(formats, names, titles[, ...]) | Class to convert formats, names, titles description to a dtype. |
| finfo | Machine limits for floating point types. |
| iinfo(type) | Machine limits for integer types. |
| MachAr([float_conv, int_conv, ...]) | Diagnosing machine parameters. |
| issctype(rep) | Determines whether the given object represents a scalar data-type. |
| issubdtype(arg1, arg2) | Returns True if first argument is a typecode lower/equal in type hierarchy. |
| issubsctype(arg1, arg2) | Determine if the first argument is a subclass of the second argument. |
| issubclass_(arg1, arg2) | Determine if a class is a subclass of a second class. |
| find_common_type(array_types, scalar_types) | Determine common type following standard coercion rules. |
| typename(char) | Return a description for the given data type code. |
| sctype2char(sctype) | Return the string representation of a scalar dtype. |
| mintypecode(typechars[, typeset, default]) | Return the character for the minimum-size type to which given types can be safely cast. |