Python 3 support

[sebastic]

Please add support for Python 3, running nik4.py with Python3 currently fails with a SyntaxError:

  File "nik4.py", line 379
    print 'scale={}'.format(scale)
                   ^
SyntaxError: invalid syntax

[sebastic]

Updating the print functions seems to be sufficient:

diff --git a/nik4.py b/nik4.py
index 4b8326b..5b2606d 100755
--- a/nik4.py
+++ b/nik4.py
@@ -376,12 +376,12 @@ if __name__ == "__main__":
                select_layers(m, options.add_layers.split(',') if options.add_layers else [], options.hide_layers.split(',') if options.hide_layers else [])

        if options.debug:
-               print 'scale={}'.format(scale)
-               print 'scale_factor={}'.format(scale_factor)
-               print 'size={},{}'.format(size[0], size[1])
-               print 'bbox={}'.format(bbox)
-               print 'bbox_wgs84={}'.format(transform.backward(bbox) if bbox else None)
-               print 'layers=' + ','.join([l.name for l in m.layers if l.active])
+               print('scale={}'.format(scale))
+               print('scale_factor={}'.format(scale_factor))
+               print('size={},{}'.format(size[0], size[1]))
+               print('bbox={}'.format(bbox))
+               print('bbox_wgs84={}'.format(transform.backward(bbox) if bbox else None))
+               print('layers=' + ','.join([l.name for l in m.layers if l.active]))

        # generate metadata
        if options.ozi:
@@ -424,14 +424,14 @@ if __name__ == "__main__":
                        m.buffer_size = TILE_BUFFER
                        tile_cnt = [int(math.ceil(1.0 * size[0] / width)), int(math.ceil(1.0 * size[1] / height))]
                        if options.debug:
-                               print 'tile_count={},{}'.format(tile_cnt[0], tile_cnt[1])
-                               print 'tile_size={},{}'.format(width, height)
+                               print('tile_count={},{}'.format(tile_cnt[0], tile_cnt[1]))
+                               print('tile_size={},{}'.format(width, height))
                        tmp_tile = '{:02d}_{:02d}_{}'
                        tile_files = []
                        for row in range(0, tile_cnt[1]):
                                for column in range(0, tile_cnt[0]):
                                        if options.debug:
-                                               print 'tile={},{}'.format(row, column)
+                                               print('tile={},{}'.format(row, column))
                                        tile_bbox = mapnik.Box2d(bbox.minx + 1.0 * width * scale * column, bbox.maxy - 1.0 * height * scale * row, bbox.minx + 1.0 * width * scale * (column + 1), bbox.maxy - 1.0 * height * scale * (row + 1))
                                        tile_size = [width if column < tile_cnt[0] - 1 else size[0] - width * (tile_cnt[0] - 1), height if row < tile_cnt[1] - 1 else size[1] - height * (tile_cnt[1] - 1)]
                                        m.zoom_to_box(tile_bbox)
@@ -465,5 +465,5 @@ if __name__ == "__main__":
                        msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)

                outfile.seek(0)
-               print outfile.read()
+               print(outfile.read())
                outfile.close()

[PanderMusubi]

Please, vote for https://bugs.launchpad.net/ubuntu/+source/nik4/+bug/1694751 to offer users installing Mapnik Python for 2 or 3