refactor: remove sys.version checks now that it's only 3.10

Author: nedbat

.github/workflows/coverage.yml

@@ -46,25 +46,19 @@ jobs:
           # tox.ini so that tox will run properly. PYVERSIONS
           # Available versions:
           # https://github.com/actions/python-versions/blob/main/versions-manifest.json
-          - "3.9"
           - "3.10"
           - "3.11"
           - "3.12"
           - "3.13"
           - "3.14"
-          - "pypy-3.9"
           - "pypy-3.10"
         exclude:
           # Mac PyPy always takes the longest, and doesn't add anything.
-          - os: macos
-            python-version: "pypy-3.9"
           - os: macos
             python-version: "pypy-3.10"
-          # Windows pypy 3.9 and 3.10 get stuck with PyPy 7.3.15.  I hope to
+          # Windows pypy 3.10 gets stuck with PyPy 7.3.15.  I hope to
           # unstick them, but I don't want that to block all other progress, so
           # skip them for now.
-          - os: windows
-            python-version: "pypy-3.9"
           - os: windows
             python-version: "pypy-3.10"
         # If we need to tweak the os version we can do it with an include like
@@ -149,7 +143,7 @@ jobs:
       - name: "Set up Python"
         uses: actions/setup-python@42375524e23c412d93fb67b49958b491fce71c38 # v5.4.0
         with:
-          python-version: "3.9" # Minimum of PYVERSIONS
+          python-version: "3.10" # Minimum of PYVERSIONS
           # At a certain point, installing dependencies failed on pypy 3.9 and
           # 3.10 on Windows.  Commenting out the cache here fixed it.  Someday
           # try using the cache again.

.github/workflows/kit.yml

@@ -154,7 +154,7 @@ jobs:
       - name: "Install Python"
         uses: actions/setup-python@42375524e23c412d93fb67b49958b491fce71c38 # v5.4.0
         with:
-          python-version: "3.9" # Minimum of PYVERSIONS
+          python-version: "3.10" # Minimum of PYVERSIONS
           cache: pip
           cache-dependency-path: 'requirements/*.pip'
 
@@ -200,7 +200,7 @@ jobs:
       - name: "Install Python"
         uses: actions/setup-python@42375524e23c412d93fb67b49958b491fce71c38 # v5.4.0
         with:
-          python-version: "3.9" # Minimum of PYVERSIONS
+          python-version: "3.10" # Minimum of PYVERSIONS
           cache: pip
           cache-dependency-path: 'requirements/*.pip'
 
@@ -241,7 +241,7 @@ jobs:
       - name: "Install PyPy"
         uses: actions/setup-python@42375524e23c412d93fb67b49958b491fce71c38 # v5.4.0
         with:
-          python-version: "pypy-3.9" # Minimum of PyPy PYVERSIONS
+          python-version: "pypy-3.10" # Minimum of PyPy PYVERSIONS
           cache: pip
           cache-dependency-path: 'requirements/*.pip'
 

.github/workflows/quality.yml

@@ -44,7 +44,7 @@ jobs:
       - name: "Install Python"
         uses: actions/setup-python@42375524e23c412d93fb67b49958b491fce71c38 # v5.4.0
         with:
-          python-version: "3.9" # Minimum of PYVERSIONS
+          python-version: "3.10" # Minimum of PYVERSIONS
           cache: pip
           cache-dependency-path: 'requirements/*.pip'
 
@@ -69,7 +69,7 @@ jobs:
       - name: "Install Python"
         uses: actions/setup-python@42375524e23c412d93fb67b49958b491fce71c38 # v5.4.0
         with:
-          python-version: "3.9" # Minimum of PYVERSIONS
+          python-version: "3.10" # Minimum of PYVERSIONS
           cache: pip
           cache-dependency-path: 'requirements/*.pip'
 

.github/workflows/testsuite.yml

@@ -46,21 +46,17 @@ jobs:
           # Available versions:
           # https://github.com/actions/python-versions/blob/main/versions-manifest.json
           # https://github.com/actions/setup-python/blob/main/docs/advanced-usage.md#available-versions-of-python-and-pypy
-          - "3.9"
           - "3.10"
           - "3.11"
           - "3.12"
           - "3.13"
           - "3.14"
-          - "pypy-3.9"
           - "pypy-3.10"
         exclude:
           # Windows pypy 3.9 and 3.10 get stuck with PyPy 7.3.15.  I hope to
           # unstick them, but I don't want that to block all other progress, so
           # skip them for now. These excludes can be removed once GitHub uses
           # PyPy 7.3.16 on Windows.  https://github.com/pypy/pypy/issues/4876
-          - os: windows
-            python-version: "pypy-3.9"
           - os: windows
             python-version: "pypy-3.10"
         # If we need to tweak the os version we can do it with an include like

coverage/parser.py

@@ -456,30 +456,9 @@ def _line_numbers(self) -> Iterable[TLineNo]:
         Uses co_lnotab described in Python/compile.c to find the
         line numbers.  Produces a sequence: l0, l1, ...
         """
-        if hasattr(self.code, "co_lines"):
-            # PYVERSIONS: new in 3.10
-            for _, _, line in self.code.co_lines():
-                if line:
+        for _, _, line in self.code.co_lines():
+            if line:
                     yield line
-        else:
-            # Adapted from dis.py in the standard library.
-            byte_increments = self.code.co_lnotab[0::2]
-            line_increments = self.code.co_lnotab[1::2]
-
-            last_line_num: TLineNo | None = None
-            line_num = self.code.co_firstlineno
-            byte_num = 0
-            for byte_incr, line_incr in zip(byte_increments, line_increments):
-                if byte_incr:
-                    if line_num != last_line_num:
-                        yield line_num
-                        last_line_num = line_num
-                    byte_num += byte_incr
-                if line_incr >= 0x80:
-                    line_incr -= 0x100
-                line_num += line_incr
-            if line_num != last_line_num:
-                yield line_num
 
     def _find_statements(self) -> Iterable[TLineNo]:
         """Find the statements in `self.code`.

coverage/phystokens.py

@@ -93,7 +93,7 @@ def find_soft_key_lines(source: str) -> set[TLineNo]:
     soft_key_lines: set[TLineNo] = set()
 
     for node in ast.walk(ast.parse(source)):
-        if sys.version_info >= (3, 10) and isinstance(node, ast.Match):
+        if isinstance(node, ast.Match):
             soft_key_lines.add(node.lineno)
             for case in node.cases:
                 soft_key_lines.add(case.pattern.lineno)

setup.py

@@ -120,7 +120,7 @@
         "Mastodon": "https://hachyderm.io/@coveragepy",
         "Mastodon (nedbat)": "https://hachyderm.io/@nedbat",
     },
-    python_requires=">=3.9",  # minimum of PYVERSIONS
+    python_requires=">=3.10",  # minimum of PYVERSIONS
 )
 
 # A replacement for the build_ext command which raises a single exception

tests/test_arcs.py

@@ -685,8 +685,6 @@ def test_confusing_for_loop_bug_175(self) -> None:
             branchz_missing="",
         )
 
-    # https://bugs.python.org/issue44672
-    @pytest.mark.xfail(env.PYVERSION < (3, 10), reason="<3.10 traced final pass incorrectly")
     def test_incorrect_loop_exit_bug_1175(self) -> None:
         self.check_coverage("""\
             def wrong_loop(x):
@@ -1876,21 +1874,9 @@ def test_lambda_in_dict(self) -> None:
         )
 
 
-# This had been a failure on Mac 3.9, but it started passing on GitHub
-# actions (running macOS 12) but still failed on my laptop (macOS 14).
-# I don't understand why it failed, I don't understand why it passed,
-# so just skip the whole thing.
-skip_eventlet_670 = pytest.mark.skipif(
-    env.PYVERSION[:2] == (3, 9) and env.CPYTHON and env.MACOS,
-    reason="Avoid an eventlet bug on Mac 3.9: eventlet#670",
-    # https://github.com/eventlet/eventlet/issues/670
-)
-
-
 class AsyncTest(CoverageTest):
     """Tests of the new async and await keywords in Python 3.5"""
 
-    @skip_eventlet_670
     def test_async(self) -> None:
         self.check_coverage("""\
             import asyncio
@@ -1914,7 +1900,6 @@ async def print_sum(x, y):                      # 8
         )
         assert self.stdout() == "Compute 1 + 2 ...\n1 + 2 = 3\n"
 
-    @skip_eventlet_670
     def test_async_for(self) -> None:
         self.check_coverage("""\
             import asyncio
@@ -1970,8 +1955,6 @@ async def go():
         )
 
     # https://github.com/nedbat/coveragepy/issues/1158
-    # https://bugs.python.org/issue44621
-    @pytest.mark.skipif(env.PYVERSION[:2] == (3, 9), reason="avoid a 3.9 bug: 44621")
     def test_bug_1158(self) -> None:
         self.check_coverage("""\
             import asyncio
@@ -1997,7 +1980,6 @@ async def async_test():
 
     # https://github.com/nedbat/coveragepy/issues/1176
     # https://bugs.python.org/issue44622
-    @skip_eventlet_670
     def test_bug_1176(self) -> None:
         self.check_coverage("""\
             import asyncio

tests/test_parser.py

@@ -578,22 +578,21 @@ def my_func_2(super_long_input_argument_0=0, super_long_input_argument_1=1, supe
         assert parser.statements == set()
 
     def test_excluding_bug1713(self) -> None:
-        if env.PYVERSION >= (3, 10):
-            parser = self.parse_text("""\
-                print("1")
-
-                def hello_3(a):  # pragma: nocover
-                    match a:
-                        case ("5"
-                              | "6"):
-                            print("7")
-                        case "8":
-                            print("9")
-
-                print("11")
-                """,
-            )
-            assert parser.statements == {1, 11}
+        parser = self.parse_text("""\
+            print("1")
+
+            def hello_3(a):  # pragma: nocover
+                match a:
+                    case ("5"
+                            | "6"):
+                        print("7")
+                    case "8":
+                        print("9")
+
+            print("11")
+            """,
+        )
+        assert parser.statements == {1, 11}
         parser = self.parse_text("""\
             print("1")
 

tests/test_venv.py

@@ -113,14 +113,10 @@ def sixth(x):
         make_file("bug888/app/testcov/__init__.py", """\
             __path__ = __import__('pkgutil').extend_path(__path__, __name__)
             """)
-        if env.PYVERSION < (3, 10):
-            get_plugins = "entry_points['plugins']"
-        else:
-            get_plugins = "entry_points.select(group='plugins')"
         make_file("bug888/app/testcov/main.py", f"""\
             import importlib.metadata
             entry_points = importlib.metadata.entry_points()
-            for entry_point in {get_plugins}:
+            for entry_point in entry_points.select(group='plugins'):
                 entry_point.load()()
             """)
         make_file("bug888/plugin/setup.py", """\