*: __future__ += absolute_imports; Use unified __future__ everywhere

- we are going to introduce golang.time, and from inside there without
  `from __future__ import absolute_imports` it won't be possible to import
  needed stdlib's time.

- we were already doing `from __future__ import print_function`, but
  only in some files.

-> It makes sense to apply updated __future__ usage uniformly.

golang/__init__.py

@@ -28,6 +28,8 @@
 ...
 """
 
+from __future__ import print_function, absolute_import
+
 __version__ = "0.0.1.post1"
 
 __all__ = ['go', 'chan', 'select', 'default', 'nilchan', 'defer', 'panic', 'recover', 'func', 'gimport']

golang/_gopath.py

-# Copyright (C) 2018  Nexedi SA and Contributors.
+# Copyright (C) 2018-2019  Nexedi SA and Contributors.
 #                          Kirill Smelkov <kirr@nexedi.com>
 #
 # This program is free software: you can Use, Study, Modify and Redistribute
@@ -30,6 +30,8 @@ will import either
 located in src/ under $GOPATH.
 """
 
+from __future__ import print_function, absolute_import
+
 import os, os.path
 import sys
 import imp

golang/_gopath_test.py

-# Copyright (C) 2018  Nexedi SA and Contributors.
+# Copyright (C) 2018-2019  Nexedi SA and Contributors.
 #                          Kirill Smelkov <kirr@nexedi.com>
 #
 # This program is free software: you can Use, Study, Modify and Redistribute
@@ -17,6 +17,8 @@
 # See COPYING file for full licensing terms.
 # See https://www.nexedi.com/licensing for rationale and options.
 
+from __future__ import print_function, absolute_import
+
 import os, os.path
 from golang._gopath import gimport
 

golang/_pycompat.py

 # -*- coding: utf-8 -*-
-# Copyright (C) 2018  Nexedi SA and Contributors.
+# Copyright (C) 2018-2019  Nexedi SA and Contributors.
 #                          Kirill Smelkov <kirr@nexedi.com>
 #
 # This program is free software: you can Use, Study, Modify and Redistribute
@@ -19,6 +19,8 @@
 # See https://www.nexedi.com/licensing for rationale and options.
 """compatibility in between py2/py3"""
 
+from __future__ import print_function, absolute_import
+
 from six import PY2
 
 if PY2:

golang/cmd/pybench.py

 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
-# Copyright (C) 2014-2018  Nexedi SA and Contributors.
+# Copyright (C) 2014-2019  Nexedi SA and Contributors.
 #                          Kirill Smelkov <kirr@nexedi.com>
 #
 # This program is free software: you can Use, Study, Modify and Redistribute
@@ -40,7 +40,8 @@ gives something like::
     Benchmarkadd    50000000        0.020 µs/op
     Benchmarkadd    50000000        0.020 µs/op
 """
-from __future__ import print_function
+
+from __future__ import print_function, absolute_import
 
 import sys
 

golang/context.py

@@ -25,7 +25,7 @@ See the following links about Go contexts:
     https://golang.org/pkg/context
 """
 
-from __future__ import print_function
+from __future__ import print_function, absolute_import
 
 from golang import go, chan, select, default, nilchan
 import threading

golang/context_test.py

@@ -18,6 +18,8 @@
 # See COPYING file for full licensing terms.
 # See https://www.nexedi.com/licensing for rationale and options.
 
+from __future__ import print_function, absolute_import
+
 from golang import context, nilchan
 from golang.context import _ready as ready
 

golang/gcompat.py

 # -*- coding: utf-8 -*-
-# Copyright (C) 2018  Nexedi SA and Contributors.
+# Copyright (C) 2018-2019  Nexedi SA and Contributors.
 #                          Kirill Smelkov <kirr@nexedi.com>
 #
 # This program is free software: you can Use, Study, Modify and Redistribute
@@ -19,6 +19,8 @@
 # See https://www.nexedi.com/licensing for rationale and options.
 """Package gcompat provides Go-compatibility layer for Python"""
 
+from __future__ import print_function, absolute_import
+
 from golang import strconv
 import six
 

golang/gcompat_test.py

 # -*- coding: utf-8 -*-
-# Copyright (C) 2018  Nexedi SA and Contributors.
+# Copyright (C) 2018-2019  Nexedi SA and Contributors.
 #                          Kirill Smelkov <kirr@nexedi.com>
 #
 # This program is free software: you can Use, Study, Modify and Redistribute
@@ -19,3 +19,5 @@
 # See https://www.nexedi.com/licensing for rationale and options.
 
 # qq is tested as part of strconv.
+
+from __future__ import print_function, absolute_import

golang/golang_test.py

@@ -18,6 +18,8 @@
 # See COPYING file for full licensing terms.
 # See https://www.nexedi.com/licensing for rationale and options.
 
+from __future__ import print_function, absolute_import
+
 from golang import go, chan, select, default, nilchan, _PanicError, func, panic, defer, recover
 from pytest import raises
 from os.path import dirname

golang/golang_test_goleaked.py

 #!/usr/bin/env python
-# Copyright (C) 2018  Nexedi SA and Contributors.
+# Copyright (C) 2018-2019  Nexedi SA and Contributors.
 #                          Kirill Smelkov <kirr@nexedi.com>
 #
 # This program is free software: you can Use, Study, Modify and Redistribute
@@ -19,7 +19,8 @@
 # See https://www.nexedi.com/licensing for rationale and options.
 """This program tests that leaked goroutines don't prevent program to exit"""
 
-from __future__ import print_function
+from __future__ import print_function, absolute_import
+
 from golang import go, chan
 import os, sys, time
 

golang/strconv.py

 # -*- coding: utf-8 -*-
-# Copyright (C) 2018  Nexedi SA and Contributors.
+# Copyright (C) 2018-2019  Nexedi SA and Contributors.
 #                          Kirill Smelkov <kirr@nexedi.com>
 #
 # This program is free software: you can Use, Study, Modify and Redistribute
@@ -19,6 +19,8 @@
 # See https://www.nexedi.com/licensing for rationale and options.
 """Package strconv provides Go-compatible string conversions"""
 
+from __future__ import print_function, absolute_import
+
 import six, unicodedata, codecs
 from six.moves import range as xrange
 

golang/strconv_test.py

@@ -18,6 +18,8 @@
 # See COPYING file for full licensing terms.
 # See https://www.nexedi.com/licensing for rationale and options.
 
+from __future__ import print_function, absolute_import
+
 from golang.strconv import quote, unquote, unquote_next
 from golang.gcompat import qq
 

golang/sync.py

@@ -24,6 +24,8 @@ See the following link about Go sync package:
     https://golang.org/pkg/sync
 """
 
+from __future__ import print_function, absolute_import
+
 import threading, sys
 from golang import go, defer, func, panic
 from golang import context

golang/sync_test.py

@@ -18,6 +18,8 @@
 # See COPYING file for full licensing terms.
 # See https://www.nexedi.com/licensing for rationale and options.
 
+from __future__ import print_function, absolute_import
+
 from golang import go, chan, _PanicError
 from golang import sync, context
 import time, threading

golang/testing.py

 # -*- coding: utf-8 -*-
-# Copyright (C) 2017-2018  Nexedi SA and Contributors.
+# Copyright (C) 2017-2019  Nexedi SA and Contributors.
 #                          Kirill Smelkov <kirr@nexedi.com>
 #
 # This program is free software: you can Use, Study, Modify and Redistribute
@@ -19,7 +19,7 @@
 # See https://www.nexedi.com/licensing for rationale and options.
 """Package testing mirrors Go testing package for things missed in Python"""
 
-from __future__ import print_function
+from __future__ import print_function, absolute_import
 
 from time import time
 from math import ceil, log10

golang/x/perf/benchlib.py

@@ -23,7 +23,7 @@
 https://github.com/golang/proposal/blob/master/design/14313-benchmark-format.md
 """
 
-from __future__ import print_function
+from __future__ import print_function, absolute_import
 
 import re, io, numpy as np
 from collections import OrderedDict

gpython/__init__.py

@@ -35,7 +35,7 @@ differences:
 # work correctly with `pip install` (gpython script is installed, but gpython module is not).
 
 # NOTE don't import anything at global scope - we need gevent to be imported first.
-from __future__ import print_function
+from __future__ import print_function, absolute_import
 
 
 # pymain mimics `python ...`

gpython/gpython_test.py

@@ -18,6 +18,8 @@
 # See COPYING file for full licensing terms.
 # See https://www.nexedi.com/licensing for rationale and options.
 
+from __future__ import print_function, absolute_import
+
 import sys, os, golang, subprocess
 from six import PY2, PY3
 from six.moves import builtins