HDFStore.__iter__

[twoertwein]

Without this PR

for key in pd.HDFStore(...):
   ...

would cause error: "List[str]" has no attribute "__next__" [attr-defined]

[twoertwein]

Enabled Y034 which in theory should have caught this (PyCQA/flake8-pyi#348). Also added Self wherever Y034 was suggesting it (could be used in many more places).

xref pandas-dev/pandas#51233

edit: Y034 has nothing do to with __iter__ If you want to postpone the introduction of Self, I can revert that part.

[Dr-Irv]

Glad you found the Y034 thing. Thanks @twoertwein

[twoertwein]

The CI seems kind of slow (most runs are queued). Should we:

• only test on the latest and oldest python versions
• still test on all python versions but test them disjointly across different platforms
• same as above but always test oldest/newest on all platforms

[Dr-Irv]

The CI seems kind of slow (most runs are queued). Should we:

• only test on the latest and oldest python versions
• still test on all python versions but test them disjointly across different platforms
• same as above but always test oldest/newest on all platforms

I think we should leave it as is. It seems the runs being queued depends on time of day, and happens more with Windows and MacOS than Linux.