Drop support for the lzma backport.

kombu/compression.py

@@ -1,17 +1,8 @@
 """Compression utilities."""
 
-from kombu.utils.encoding import ensure_bytes
-
 import zlib
 
-try:
-    import lzma
-except ImportError:  # pragma: no cover
-    # TODO: Drop fallback to backports once we drop Python 2.7 support
-    try:
-        from backports import lzma
-    except ImportError:  # pragma: no cover
-        lzma = None
+from kombu.utils.encoding import ensure_bytes
 
 _aliases = {}
 _encoders = {}
@@ -82,7 +73,7 @@ def decompress(body, content_type):
 
 try:
     import bz2
-except ImportError:
+except ImportError:  # pragma: no cover
     pass  # No bz2 support
 else:
     register(bz2.compress,
@@ -98,8 +89,11 @@ def decompress(body, content_type):
              brotli.decompress,
              'application/x-brotli', aliases=['brotli'])
 
-# TODO: Drop condition once we drop Python 2.7 support
-if lzma:  # pragma: no cover
+try:
+    import lzma
+except ImportError:  # pragma: no cover
+    pass  # no lzma support
+else:
     register(lzma.compress,
              lzma.decompress,
              'application/x-lzma', aliases=['lzma', 'xz'])

t/unit/test_compression.py

@@ -1,7 +1,6 @@
-import pytest
-
 import sys
 
+import pytest
 from case import mock
 
 from kombu import compression
@@ -26,11 +25,6 @@ def test_encoders__lzma(self):
 
         assert 'application/x-lzma' in compression.encoders()
 
-    def test_encoders__backports_lzma(self):
-        pytest.importorskip('backports.lzma')
-
-        assert 'application/x-lzma' in compression.encoders()
-
     def test_encoders__zstd(self):
         pytest.importorskip('zstandard')
 
@@ -55,18 +49,12 @@ def test_compress__decompress__brotli(self):
 
         text = b'The Brown Quick Fox Over The Lazy Dog Jumps'
         c, ctype = compression.compress(text, 'brotli')
-
-    def test_compress__decompress__lzma(self):
-        pytest.importorskip('lzma')
-
-        text = b'The Brown Quick Fox Over The Lazy Dog Jumps'
-        c, ctype = compression.compress(text, 'lzma')
         assert text != c
         d = compression.decompress(c, ctype)
         assert d == text
 
-    def test_compress__decompress__backports_lzma(self):
-        pytest.importorskip('backports.lzma')
+    def test_compress__decompress__lzma(self):
+        pytest.importorskip('lzma')
 
         text = b'The Brown Quick Fox Over The Lazy Dog Jumps'
         c, ctype = compression.compress(text, 'lzma')
@@ -92,3 +80,13 @@ def test_no_bz2(self):
         finally:
             if c is not None:
                 sys.modules['kombu.compression'] = c
+
+    @mock.mask_modules('lzma')
+    def test_no_lzma(self):
+        c = sys.modules.pop('kombu.compression')
+        try:
+            import kombu.compression
+            assert not hasattr(kombu.compression, 'lzma')
+        finally:
+            if c is not None:
+                sys.modules['kombu.compression'] = c