The PEP has: In Python there will be a hierchial set of classes defined: GenericArray (type classes) BooleanArray (Bool) NumericArray (XX is the bit-width of the type) SignedArray UnsignedArray IntegerArray SignedIntegerArray (IntXX) UnsignedIntegerArray (UIntXX) FloatArray (FloatXX) ComplexArray (FloatXX) FlexibleArray CharacterArray StringArray (String) UnicodeArray (Unicode) VoidArray (Void) ObjectArray It seems that the record type is to be handled under the VoidArray. I hope that it will permit the setting and reading of fields. For example, if recs is an instance of an Array of records, then it should be possible to write: >>> recs[22, 5].sex= 'F' >>> recs[22, 5].sex F It is not clear, from the current draft, what is intended for ObjectArray. Can these be any Python objects tuple, list etc. or instances of any user defined class? There is also a tofile method ( I would prefer toFile), does this mean that pickling would be used for the object instances? The term WRITABLE is used, is this different from "mutable", the term used by Python? "Methods such as x.r(), x.i(), and x.flatten() are proposed.". Why not use properties, x.r, x.i and x.flatten. The parentheses appear redundant. Colin W.