On Friday 18 August 2006 15:25, Travis Oliphant wrote: > Sebastian Haase wrote: > > On Friday 18 August 2006 11:38, Travis Oliphant wrote: > >> Sebastian Haase wrote: > >>> Hi, > >>> array dtype descriptors have an attribute itemsize that gives the > >>> total number of bytes required for an item of that dtype. > >>> > >>> Scalar types, like numy.int32, also have that attribute, > >>> but it returns "something else" - don't know what: > >>> > >>> > >>> Furthermore there are *lot's* of more attributes to a scalar dtype, > >>> e.g. > >> > >> The scalar types are actual Python types (classes) whereas the dtype > >> objects are instances. > >> > >> The attributes you are seeing of the typeobject are very useful when you > >> have an instance of that type. > >> > >> With numpy.int32.itemsize you are doing the equivalent of > >> numpy.dtype.itemsize > > > > but why then do I not get the result 4 ? > > Because it's not a "class" attribute, it's an instance attribute. > > What does numpy.dtype.itemsize give you? > I'm really sorry for being so dumb - but HOW can I get then the number of bytes needed by a given scalar type ?
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