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tests: enable import checker for tests/**.py files...

tests: enable import checker for tests/**.py files Several known-bad files are excluded as they couldn't be trivially fixed. In principle, we should fix them first, however, it would have more risk to keep Py3k porting going without the test coverage. Still contrib/**.py aren't covered, which needs another round.

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      # pycompat.py - portability shim for python 3

      #

      # This software may be used and distributed according to the terms of the

      # GNU General Public License version 2 or any later version.

      """Mercurial portability shim for python 3.

      This contains aliases to hide python version-specific details from the core.

      """

      from __future__ import absolute_import

      try:

          import cStringIO as io

          stringio = io.StringIO

      except ImportError:

          import io

          stringio = io.StringIO

      try:

          import Queue as _queue

          _queue.Queue

      except ImportError:

          import queue as _queue

      empty = _queue.Empty

      queue = _queue.Queue

      try:

          xrange

      except NameError:

          import builtins

          builtins.xrange = range

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				# pycompat.py - portability shim for python 3
				#
				# This software may be used and distributed according to the terms of the
				# GNU General Public License version 2 or any later version.

				"""Mercurial portability shim for python 3.

				This contains aliases to hide python version-specific details from the core.
				"""

				from __future__ import absolute_import

				try:
				import cStringIO as io
				stringio = io.StringIO
				except ImportError:
				import io
				stringio = io.StringIO

				try:
				import Queue as _queue
				_queue.Queue
				except ImportError:
				import queue as _queue
				empty = _queue.Empty
				queue = _queue.Queue

				try:
				xrange
				except NameError:
				import builtins
				builtins.xrange = range