tests: drop py2 support from test-demandimport.py

pytype: add coverage for parts of hgext There are tons of things to fix here (which have been blacklisted for now), but this should help prevent further regressions.

convert: stop passing str to the dateutil API in darcs I'm sure there's a bunch more stuff in here that's broken, but this was flagged by pytype.

typing: suppress a couple of attribute-errors in convert I thought these might be real issues, but they're not.

hooklib: force an exception wrapped by errors.Abort to bytestr Flagged by PyCharm and pytype.

notify: force an exception wrapped by errors.Abort to bytestr Flagged by PyCharm and pytype.

typing: disable a bogus attribute-error warning in phabricator In a local pytype run, this fixes: File "/mnt/c/Users/Matt/hg/hgext/phabricator.py", line 359, in <lambda>: No attribute 'items' on bytes [attribute-error] In Union[Any, bytes] Called from (traceback): line 363, in process The `bytes` case takes the previous `if` branch though.

sparse: fix a py2 based usage of `map()` In a local pytype run, this fixes: File "/mnt/c/Users/Matt/hg/hgext/sparse.py", line 386, in debugsparse: unsupported operand type(s) for item retrieval: 'fcounts: Iterator[int]' and '0: int' [unsupported-operands] No attribute '__getitem__' on 'fcounts: Iterator[int]' File "/mnt/c/Users/Matt/hg/hgext/sparse.py", line 387, in debugsparse: unsupported operand type(s) for item retrieval: 'fcounts: Iterator[int]' and '1: int' [unsupported-operands] No attribute '__getitem__' on 'fcounts: Iterator[int]' File "/mnt/c/Users/Matt/hg/hgext/sparse.py", line 388, in debugsparse: unsupported operand type(s) for item retrieval: 'fcounts: Iterator[int]' and '2: int' [unsupported-operands] No attribute '__getitem__' on 'fcounts: Iterator[int]'

typing: adjust `mercurial.util.iterlines()` to accept any `Iterable` In a local pytype run on the extensions, this fixes: File "/mnt/c/Users/Matt/hg/hgext/phabricator.py", line 788, in maketext: Function mercurial.util.iterlines was called with the wrong arguments [wrong-arg-types] Expected: (iterator: Iterator[bytes]) Actually passed: (iterator: list) Attributes of protocol Iterator[bytes] are not implemented on list: __next__

typing: disable an attribute-error warning in the journal extension The code is complicated enough that pytype doesn't realize that `name` can't be `None` if it is evaluated here.