bindings: try importing collections.abc first for forward compatibility

Using the babeltrace Python module with Python 3.3-3.8 gives a warning:

/usr/lib/python3/dist-packages/babeltrace/babeltrace.py:811:
DeprecationWarning: Using or importing the ABCs from 'collections'
instead of from 'collections.abc' is deprecated since Python 3.3,
and in 3.9 it will stop working

Therefore, for forward compability (Python 3.9+), try importing it
using the new way first. Otherwise, fall back on the old way.

Signed-off-by: Christophe Bedard <bedard.christophe@gmail.com>
Change-Id: I7f650593a013643b2fb0b77b0d388cf57bc2b765
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

diff --git a/bindings/python/babeltrace/babeltrace.i.in b/bindings/python/babeltrace/babeltrace.i.in
index a773e9b37379899dbf597117976f774221c126de..8eec1c1d1e7864ea1a6aa21063d0b50a90fb1aed 100644 (file)
--- a/bindings/python/babeltrace/babeltrace.i.in
+++ b/bindings/python/babeltrace/babeltrace.i.in
@@ -672,8 +672,11 @@ class CTFScope:
 _scopes = [CTFScope.EVENT_FIELDS, CTFScope.EVENT_CONTEXT, CTFScope.STREAM_EVENT_CONTEXT,
        CTFScope.STREAM_EVENT_HEADER, CTFScope.STREAM_PACKET_CONTEXT, CTFScope.TRACE_PACKET_HEADER]
 
-import collections
-class Event(collections.Mapping):
+try:
+       import collections.abc as collections_abc
+except ImportError:
+       import collections as collections_abc  # Fallback for Python 3.2
+class Event(collections_abc.Mapping):
        """
        This class represents an event from the trace.
        It is obtained using the TraceCollection generator functions.