native except handler API

.appveyor.yml

@@ -4,8 +4,6 @@ os: Visual Studio 2015
 
 environment:
   matrix:
-    - PYTHON: "C:\\Python35"
-    - PYTHON: "C:\\Python35-x64"
     - PYTHON: "C:\\Python36"
     - PYTHON: "C:\\Python36-x64"
     - PYTHON: "C:\\Python37"

.travis.yml

@@ -1,6 +1,6 @@
+os: linux
 language: python
-sudo: false
-dist: trusty
+dist: focal
 
 matrix:
   include:
@@ -9,26 +9,17 @@ matrix:
       env: CHECK_DOCS=1
     - python: 3.6
       env: CHECK_FORMATTING=1
-    # The pypy tests are slow, so list them early
-    - python: pypy3.5
+    # The pypy tests are slow, so we list them first
+    - python: pypy3.6-7.2.0
+      dist: bionic
     # Uncomment if you want to test on pypy nightly:
     # - language: generic
-    #   env: USE_PYPY_NIGHTLY=1
-    - python: 3.5.0
-    - python: 3.5.2
+    #   env: PYPY_NIGHTLY_BRANCH=py3.6
     - python: 3.6
-    # As of 2018-07-05, Travis's 3.7 and 3.8 builds only work if you
-    # use dist: xenial AND sudo: required
-    # See: https://github.com/python-trio/trio/pull/556#issuecomment-402879391
-    - python: 3.7
-      dist: xenial
-      sudo: required
+    - python: 3.6-dev
+    - python: 3.7-dev
     - python: 3.8-dev
-      dist: xenial
-      sudo: required
-    - os: osx
-      language: generic
-      env: MACPYTHON=3.5.4
+    - python: 3.9-dev
     - os: osx
       language: generic
       env: MACPYTHON=3.6.6

exceptiongroup/__init__.py

@@ -4,64 +4,6 @@
 
 __all__ = ["ExceptionGroup", "split", "catch"]
 
-
-class ExceptionGroup(BaseException):
-    """An exception that contains other exceptions.
-
-    Its main use is to represent the situation when multiple child tasks all
-    raise errors "in parallel".
-
-    Args:
-      message (str): A description of the overall exception.
-      exceptions (list): The exceptions.
-      sources (list): For each exception, a string describing where it came
-        from.
-
-    Raises:
-      TypeError: if any of the passed in objects are not instances of
-          :exc:`BaseException`.
-      ValueError: if the exceptions and sources lists don't have the same
-          length.
-
-    """
-
-    def __init__(self, message, exceptions, sources):
-        super().__init__(message, exceptions, sources)
-        self.exceptions = list(exceptions)
-        for exc in self.exceptions:
-            if not isinstance(exc, BaseException):
-                raise TypeError(
-                    "Expected an exception object, not {!r}".format(exc)
-                )
-        self.message = message
-        self.sources = list(sources)
-        if len(self.sources) != len(self.exceptions):
-            raise ValueError(
-                "different number of sources ({}) and exceptions ({})".format(
-                    len(self.sources), len(self.exceptions)
-                )
-            )
-
-    # copy.copy doesn't work for ExceptionGroup, because BaseException have
-    # rewrite __reduce_ex__ method.  We need to add __copy__ method to
-    # make it can be copied.
-    def __copy__(self):
-        new_group = self.__class__(self.message, self.exceptions, self.sources)
-        new_group.__traceback__ = self.__traceback__
-        new_group.__context__ = self.__context__
-        new_group.__cause__ = self.__cause__
-        # Setting __cause__ also implicitly sets the __suppress_context__
-        # attribute to True.  So we should copy __suppress_context__ attribute
-        # last, after copying __cause__.
-        new_group.__suppress_context__ = self.__suppress_context__
-        return new_group
-
-    def __str__(self):
-        return ", ".join(repr(exc) for exc in self.exceptions)
-
-    def __repr__(self):
-        return "<ExceptionGroup: {}>".format(self)
-
-
+from ._exception_group import ExceptionGroup
 from . import _monkeypatch
 from ._tools import split, catch