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Data type routines

can_cast(from_, to[, 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.

Creating data types

dtype(obj[, align, copy]) Create a data type object.
format_parser(formats, names, titles[, …]) Class to convert formats, names, titles description to a dtype.

Data type information

finfo(dtype) Machine limits for floating point types.
iinfo(type) Machine limits for integer types.
MachAr([float_conv, int_conv, …]) Diagnosing machine parameters.

Data type testing

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.

Miscellaneous

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.
maximum_sctype(t) Return the scalar type of highest precision of the same kind as the input.

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Licensed under the 3-clause BSD License.
https://docs.scipy.org/doc/numpy-1.17.0/reference/routines.dtype.html