Creation of struct_seq types

[freddrake]

BPO	624827
Nosy	@freddrake, @devdanzin

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2009-02-09.22:17:58.896>
created_at = <Date 2002-10-17.18:51:59.000>
labels = ['extension-modules', 'type-feature']
title = 'Creation of struct_seq types'
updated_at = <Date 2009-02-09.22:17:58.895>
user = 'https://github.com/freddrake'

bugs.python.org fields:

activity = <Date 2009-02-09.22:17:58.895>
actor = 'rhettinger'
assignee = 'none'
closed = True
closed_date = <Date 2009-02-09.22:17:58.896>
closer = 'rhettinger'
components = ['Extension Modules']
creation = <Date 2002-10-17.18:51:59.000>
creator = 'fdrake'
dependencies = []
files = []
hgrepos = []
issue_num = 624827
keywords = []
message_count = 5.0
messages = ['12819', '12820', '12821', '12822', '81500']
nosy_count = 3.0
nosy_names = ['fdrake', 'ehuss', 'ajaksu2']
pr_nums = []
priority = 'normal'
resolution = 'out of date'
stage = None
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue624827'
versions = []

[freddrake]

It would be really nice to be able to create structure
sequence types from within Python. MvL suggested:
-------------------
... I think all you need to do is to expose
PyStructSequence_InitType. I would recommend an
interface like

struct_seq(name, doc, n_in_sequence, (fields))

where fields is a list of (name,doc) tuples. You will
need to temporarily allocate a PyStructSequence_Field
array of len(fields)+1 elements, and put the
PyStructSequence_Desc on the stack. You will also need
to dynamically allocate a PyTypeObject which you return.

I would put this into the new module.
-------------------
Assigned to me since I actually wanted to create these
things.

[freddrake]

Logged In: YES
user_id=3066

As part of this, struct_seq types should be made subclassable.

[ehuss]

Logged In: YES
user_id=393416

Uploaded patch 980098 which implements this functionality as
a separate module.

[freddrake]

Logged In: YES
user_id=3066

I'm not going to have any time to look at this; hopefully
somebody else can, since it's a pretty reasonable idea I
think. It may not be as valuable as it once was, however
(subclassing tuple and using properties has become more
attractive using an @Property decoration).

[devdanzin]

bpo-980098 was considered obsolete now there is namedtuple, so this
one should be closed too.