Adding does_not_raise to documentation only

src/_pytest/python_api.py

@@ -4,7 +4,6 @@ import math
 import pprint
 import sys
 import warnings
-from contextlib import contextmanager
 from decimal import Decimal
 from numbers import Number
 
@@ -735,37 +734,3 @@ class RaisesContext(object):
         if self.match_expr is not None and suppress_exception:
             self.excinfo.match(self.match_expr)
         return suppress_exception
-
-
-# builtin pytest.does_not_raise helper
-
-
-@contextmanager
-def does_not_raise():
-    r'''
-    This context manager is a complement to ``pytest.raises()`` that does
-    *not* catch any exceptions raised by the code block.
-
-
-    This is essentially a *no-op* but is useful when
-    conditionally parametrizing tests that may or may not
-    raise an error. For example::
-
-        @pytest.mark.parametrize('example_input,expectation', [
-            (3, does_not_raise()),
-            (2, does_not_raise()),
-            (1, does_not_raise()),
-            (0, raises(ZeroDivisionError)),
-        ])
-        def test_division(example_input, expectation):
-            """Test how much I know division."""
-            with expectation as excinfo:
-                assert (6 / example_input) is not None
-
-    Note that `excinfo` will be *None* when using
-    ``does_not_raise``. In the example above, `execinfo`
-    will be `None` for the first three runs and
-    an :class:`ExceptionInfo` instance on last run.
-    '''
-
-    yield