py3: replace tests for attribute iteritems

[dkrenn]

Replace hasattr( ..., 'iteritems') by hasattr( ..., 'items').

[dkrenn]

...a first start.

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New commits:

​c5e75a0

fix dicts and iter etc

[cheuberg]

I'd prefer to have a solution which solves this at a more global level, e.g. a function has_items() which performs this check and can be removed at the fullness of time when python2 support is dropped; similar in style to six. If these here are the only occurrences within all of sage, then this would of course be overkill.

[vklein]

For the record #26468 and #26466 fix some py3 issues for FiniteStateMachines?.

[vklein]

And note that mapping types also have an items methods in python2. I think if hasattr(data, 'iteritems') or hasattr(data, 'items'): can be simplified into if hasattr(data, 'items'):.

[chapoton]

here is the simplest way to go

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New commits:

​3220613

no attribute 'iteritems' in python3