design question: generator object with other attributes

[Alan Isaac]

Essentially I want a generator that I can query about
its characteristics . (E.g., a random number generator
that I want to be able to ask about is distributional
parameters.)

I am thinking of a class that wraps a generator.
An object of this class will have a ``next`` method that simply
returns the value the object get by calling the wrapped
generator.

A reasonable approach?

Thanks,
Alan Isaac

PS Here is a useless class to illustrate the basic idea
that you could have both attribute access and a
generator-connected ``next`` method.

class Start2Stop:
def __init(start,st op):
self.start = start
self.stop = stop
self.numgen = (i for in in xrange(start,st op))
def next(self):
return self.numgen.nex t()

[Robert Kern]

Re: design question: generator object with other attributes

Alan Isaac wrote:

Essentially I want a generator that I can query about
its characteristics . (E.g., a random number generator
that I want to be able to ask about is distributional
parameters.)
>
I am thinking of a class that wraps a generator.
An object of this class will have a ``next`` method that simply
returns the value the object get by calling the wrapped
generator.

You will probably also need to define

def __iter__(self):
return self

if I remember correctly.

--
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco

[James Stroud]

Re: design question: generator object with other attributes

Alan Isaac wrote:

Essentially I want a generator that I can query about
its characteristics . (E.g., a random number generator
that I want to be able to ask about is distributional
parameters.)
>
I am thinking of a class that wraps a generator.
An object of this class will have a ``next`` method that simply
returns the value the object get by calling the wrapped
generator.
>
A reasonable approach?
>
Thanks,
Alan Isaac
>
PS Here is a useless class to illustrate the basic idea
that you could have both attribute access and a
generator-connected ``next`` method.
>
class Start2Stop:
def __init(start,st op):
self.start = start
self.stop = stop
self.numgen = (i for in in xrange(start,st op))
def next(self):
return self.numgen.nex t()
>
>
>

In case you are having problems, "__init(start,s top)" should be spelled
"__init__(s elf, start, stop)".

James

[Alex Martelli]

Re: design question: generator object with other attributes

Alan Isaac <aisaac@america n.eduwrote:

Essentially I want a generator that I can query about
its characteristics . (E.g., a random number generator
that I want to be able to ask about is distributional
parameters.)
>
I am thinking of a class that wraps a generator.
An object of this class will have a ``next`` method that simply
returns the value the object get by calling the wrapped
generator.
>
A reasonable approach?

Sure, given the undiscussed constraints.

>
Thanks,
Alan Isaac
>
PS Here is a useless class to illustrate the basic idea
that you could have both attribute access and a
generator-connected ``next`` method.
>
class Start2Stop:
def __init(start,st op):
self.start = start
self.stop = stop
self.numgen = (i for in in xrange(start,st op))
def next(self):
return self.numgen.nex t()

Don't forget to add:

def __iter__(self): return self


Alex.