[issue1820] Enhance Object/structseq.c to match namedtuple and tuple api

[Stefan Krah]

Stefan Krah added the comment:

Sunny, is there a definition of "visible positional fields"? Currently,
it seems to me that in os.stat_result we have the opposite problem, namely
"visible non-positional" fields:

For example, st_atime_ns is visible but not indexable:

os.stat_result(st_mode=33188, st_ino=524840, st_dev=64513, st_nlink=1, st_uid=0, st_gid=0, st_size=2113, st_atime=1401225421, st_mtime=1398786163, st_ctime=1398786163)
>>> x[9]
1398786163
>>> x.st_atime_ns
1401225421887116783
>>> x[10] 
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IndexError: tuple index out of range

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