Raymond Hettinger wrote:

Here's a couple more if you want to proceed down that path:

1. Have structseq subclass from PyTupleObject so that isinstance(s,
tuple) returns True.  This makes the object usable whenever 
tuples are needed.

2. Add _fields, _asdict, and _replace to match the API in
collections.namedtuple().  The _fields tuple should only include the 
visible positional fields while _asdict() and _replace() should include
all of the fields whether visible or accessible only by 
attribute access.

3. Change the constructor to accept keyword args so that eval(repr(s))
== s works.

NOTE:
I've marked the task as easy but it's not a task for a total newbie.
It's a feasible yet challenging task for somebody who likes to get into
CPython core programming. Basic C knowledge is required!