This PR is for discussion purposes but it contains changes which are ready to merge.
Please review from easiest to longest: Template, Adapter, Memento

Template: not much changed (I expect it to be the common case for other examples)

Adapter: I don't know why the diff is like that, it shows many functions I didn't touch. My advice for this particular commit is to compare before/after files by eye.
Because the important change is in one line:
before

# in main()
print(objects[0].__dict__)
# output
{'make_noise': <bound method Dog.bark of <__main__.Dog object at 0x7f631ba3fb00>>, 'obj': <__main__.Dog object at 0x7f631ba3fb00>}    # noqa flake8

after

 >>> objects[0].__dict__['obj'], objects[0].__dict__['make_noise']
(<...Dog object at 0x...>, <bound method Dog.bark of <...Dog object at 0x...>>)

"..." dots represent module and object memory address.

Memento
most of traceback is intentionally hidden under "..."

I will also describe some transition subtleties in #258 to discuss further

@faif please let me know if I should proceed with other examples.
Although this PR is ready as is.