Change EnvironmentError, IOError to OSError - they are aliases

Since Python 3.3, these are aliases for OSError:
https://docs.python.org/3/whatsnew/3.3.html#pep-3151-reworking-the-os-and-io-exception-hierarchy

doc/en/example/assertion/failure_demo.py

@@ -167,7 +167,7 @@ class TestRaises:
         raises(TypeError, int, s)
 
     def test_raises_doesnt(self):
-        raises(IOError, int, "3")
+        raises(OSError, int, "3")
 
     def test_raise(self):
         raise ValueError("demo error")

doc/en/example/reportingdemo.rst

@@ -406,7 +406,7 @@ Here is a nice run of several failures and how ``pytest`` presents things:
     self = <failure_demo.TestRaises object at 0xdeadbeef>
 
         def test_raises_doesnt(self):
-    >       raises(IOError, int, "3")
+    >       raises(OSError, int, "3")
     E       Failed: DID NOT RAISE <class 'OSError'>
 
     failure_demo.py:170: Failed

doc/en/monkeypatch.rst

@@ -268,7 +268,7 @@ to do this using the ``setenv`` and ``delenv`` method. Our example code to test:
 
     def get_os_user_lower():
         """Simple retrieval function.
-        Returns lowercase USER or raises EnvironmentError."""
+        Returns lowercase USER or raises OSError."""
         username = os.getenv("USER")
 
         if username is None:
@@ -293,7 +293,7 @@ both paths can be safely tested without impacting the running environment:
 
 
     def test_raise_exception(monkeypatch):
-        """Remove the USER env var and assert EnvironmentError is raised."""
+        """Remove the USER env var and assert OSError is raised."""
         monkeypatch.delenv("USER", raising=False)
 
         with pytest.raises(OSError):

src/_pytest/_code/source.py

@@ -307,7 +307,7 @@ def getfslineno(obj: Any) -> Tuple[Union[str, py.path.local], int]:
         if fspath:
             try:
                 _, lineno = findsource(obj)
-            except IOError:
+            except OSError:
                 pass
         return fspath, lineno
     else:

src/_pytest/assertion/rewrite.py

@@ -284,7 +284,7 @@ if sys.platform == "win32":
         try:
             with atomic_write(fspath(pyc), mode="wb", overwrite=True) as fp:
                 _write_pyc_fp(fp, source_stat, co)
-        except EnvironmentError as e:
+        except OSError as e:
             state.trace("error writing pyc file at {}: {}".format(pyc, e))
             # we ignore any failure to write the cache file
             # there are many reasons, permission-denied, pycache dir being a
@@ -299,7 +299,7 @@ else:
         proc_pyc = "{}.{}".format(pyc, os.getpid())
         try:
             fp = open(proc_pyc, "wb")
-        except EnvironmentError as e:
+        except OSError as e:
             state.trace(
                 "error writing pyc file at {}: errno={}".format(proc_pyc, e.errno)
             )
@@ -308,7 +308,7 @@ else:
         try:
             _write_pyc_fp(fp, source_stat, co)
             os.rename(proc_pyc, fspath(pyc))
-        except EnvironmentError as e:
+        except OSError as e:
             state.trace("error writing pyc file at {}: {}".format(pyc, e))
             # we ignore any failure to write the cache file
             # there are many reasons, permission-denied, pycache dir being a
@@ -338,7 +338,7 @@ def _read_pyc(source, pyc, trace=lambda x: None):
     """
     try:
         fp = open(fspath(pyc), "rb")
-    except IOError:
+    except OSError:
         return None
     with fp:
         try:
@@ -346,8 +346,8 @@ def _read_pyc(source, pyc, trace=lambda x: None):
             mtime = int(stat_result.st_mtime)
             size = stat_result.st_size
             data = fp.read(12)
-        except EnvironmentError as e:
+        except OSError as e:
-            trace("_read_pyc({}): EnvironmentError {}".format(source, e))
+            trace("_read_pyc({}): OSError {}".format(source, e))
             return None
         # Check for invalid or out of date pyc file.
         if (

src/_pytest/cacheprovider.py

@@ -121,7 +121,7 @@ class Cache:
         try:
             with path.open("r") as f:
                 return json.load(f)
-        except (ValueError, IOError, OSError):
+        except (ValueError, OSError):
             return default
 
     def set(self, key, value):
@@ -140,7 +140,7 @@ class Cache:
             else:
                 cache_dir_exists_already = self._cachedir.exists()
                 path.parent.mkdir(exist_ok=True, parents=True)
-        except (IOError, OSError):
+        except OSError:
             self.warn("could not create cache path {path}", path=path)
             return
         if not cache_dir_exists_already:
@@ -148,7 +148,7 @@ class Cache:
         data = json.dumps(value, indent=2, sort_keys=True)
         try:
             f = path.open("w")
-        except (IOError, OSError):
+        except OSError:
             self.warn("cache could not write path {path}", path=path)
         else:
             with f:

src/_pytest/capture.py

@@ -689,7 +689,7 @@ class DontReadFromInput:
     encoding = None
 
     def read(self, *args):
-        raise IOError(
+        raise OSError(
             "pytest: reading from stdin while output is captured!  Consider using `-s`."
         )
 

src/_pytest/config/findpaths.py

@@ -15,7 +15,7 @@ if TYPE_CHECKING:
     from . import Config  # noqa: F401
 
 
-def exists(path, ignore=EnvironmentError):
+def exists(path, ignore=OSError):
     try:
         return path.check()
     except ignore:

src/_pytest/fixtures.py

@@ -715,7 +715,7 @@ class FixtureLookupError(LookupError):
             fspath, lineno = getfslineno(function)
             try:
                 lines, _ = inspect.getsourcelines(get_real_func(function))
-            except (IOError, IndexError, TypeError):
+            except (OSError, IndexError, TypeError):
                 error_msg = "file %s, line %s: source code not available"
                 addline(error_msg % (fspath, lineno + 1))
             else:

src/_pytest/pathlib.py

@@ -178,7 +178,7 @@ def make_numbered_dir(root: Path, prefix: str) -> Path:
             _force_symlink(root, prefix + "current", new_path)
             return new_path
     else:
-        raise EnvironmentError(
+        raise OSError(
             "could not create numbered dir with prefix "
             "{prefix} in {root} after 10 tries".format(prefix=prefix, root=root)
         )
@@ -190,14 +190,14 @@ def create_cleanup_lock(p: Path) -> Path:
     try:
         fd = os.open(str(lock_path), os.O_WRONLY | os.O_CREAT | os.O_EXCL, 0o644)
     except FileExistsError as e:
-        raise EnvironmentError("cannot create lockfile in {path}".format(path=p)) from e
+        raise OSError("cannot create lockfile in {path}".format(path=p)) from e
     else:
         pid = os.getpid()
         spid = str(pid).encode()
         os.write(fd, spid)
         os.close(fd)
         if not lock_path.is_file():
-            raise EnvironmentError("lock path got renamed after successful creation")
+            raise OSError("lock path got renamed after successful creation")
         return lock_path
 
 
@@ -212,7 +212,7 @@ def register_cleanup_lock_removal(lock_path: Path, register=atexit.register):
             return
         try:
             lock_path.unlink()
-        except (OSError, IOError):
+        except OSError:
             pass
 
     return register(cleanup_on_exit)
@@ -228,7 +228,7 @@ def maybe_delete_a_numbered_dir(path: Path) -> None:
         garbage = parent.joinpath("garbage-{}".format(uuid.uuid4()))
         path.rename(garbage)
         rm_rf(garbage)
-    except (OSError, EnvironmentError):
+    except OSError:
         #  known races:
         #  * other process did a cleanup at the same time
         #  * deletable folder was found
@@ -240,7 +240,7 @@ def maybe_delete_a_numbered_dir(path: Path) -> None:
         if lock_path is not None:
             try:
                 lock_path.unlink()
-            except (OSError, IOError):
+            except OSError:
                 pass
 
 

testing/acceptance_test.py

@@ -463,7 +463,7 @@ class TestGeneralUsage:
         p = testdir.makepyfile(
             """
             def raise_error(obj):
-                raise IOError('source code not available')
+                raise OSError('source code not available')
 
             import inspect
             inspect.getsourcelines = raise_error

testing/test_argcomplete.py

@@ -20,7 +20,7 @@ def equal_with_bash(prefix, ffc, fc, out=None):
 
 # copied from argcomplete.completers as import from there
 # also pulls in argcomplete.__init__ which opens filedescriptor 9
-# this gives an IOError at the end of testrun
+# this gives an OSError at the end of testrun
 
 
 def _wrapcall(*args, **kargs):

testing/test_assertrewrite.py

@@ -971,7 +971,7 @@ class TestAssertionRewriteHookDetails:
 
             @contextmanager
             def atomic_write_failed(fn, mode="r", overwrite=False):
-                e = IOError()
+                e = OSError()
                 e.errno = 10
                 raise e
                 yield
@@ -981,10 +981,10 @@ class TestAssertionRewriteHookDetails:
             )
         else:
 
-            def raise_ioerror(*args):
+            def raise_oserror(*args):
-                raise IOError()
+                raise OSError()
 
-            monkeypatch.setattr("os.rename", raise_ioerror)
+            monkeypatch.setattr("os.rename", raise_oserror)
 
         assert not _write_pyc(state, [1], os.stat(source_path), pycpath)
 

testing/test_capture.py

@@ -829,10 +829,10 @@ def test_dontreadfrominput():
     f = DontReadFromInput()
     assert f.buffer is f
     assert not f.isatty()
-    pytest.raises(IOError, f.read)
+    pytest.raises(OSError, f.read)
-    pytest.raises(IOError, f.readlines)
+    pytest.raises(OSError, f.readlines)
     iter_f = iter(f)
-    pytest.raises(IOError, next, iter_f)
+    pytest.raises(OSError, next, iter_f)
     pytest.raises(UnsupportedOperation, f.fileno)
     f.close()  # just for completeness
 
@@ -1083,7 +1083,7 @@ class TestStdCapture:
         print("XXX which indicates an error in the underlying capturing")
         print("XXX mechanisms")
         with self.getcapture():
-            pytest.raises(IOError, sys.stdin.read)
+            pytest.raises(OSError, sys.stdin.read)
 
 
 class TestTeeStdCapture(TestStdCapture):
@@ -1356,7 +1356,7 @@ def test_crash_on_closing_tmpfile_py27(testdir):
     result = testdir.runpytest_subprocess(str(p))
     assert result.ret == 0
     assert result.stderr.str() == ""
-    result.stdout.no_fnmatch_line("*IOError*")
+    result.stdout.no_fnmatch_line("*OSError*")
 
 
 def test_global_capture_with_live_logging(testdir):

testing/test_tmpdir.py

@@ -264,7 +264,7 @@ class TestNumberedDir:
         from _pytest.pathlib import create_cleanup_lock
 
         lockfile = create_cleanup_lock(d)
-        with pytest.raises(EnvironmentError, match="cannot create lockfile in .*"):
+        with pytest.raises(OSError, match="cannot create lockfile in .*"):
             create_cleanup_lock(d)
 
         lockfile.unlink()