Investigate suspicious use of object.__setattr__

[stephenworsley]

As mentioned here #3511 (comment) , there are a handful of cases where object.__setattr__() are used which appear dubious and could potentially be changed as part of removing Python 2 (or as part of generally improving code):

iris/lib/iris/fileformats/pp.py

Line 392 in 66423f8

object.__setattr__(self, name, self[index])

iris/lib/iris/fileformats/pp.py

Line 460 in 66423f8

object.__setattr__(self, name, value)

iris/lib/iris/fileformats/pp.py

Line 470 in 66423f8

object.__setattr__(self, name, value)

iris/lib/iris/util.py

Line 860 in 66423f8

object.__setattr__(self, name, value)

These could be worth investigating to see how legit they are.

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