HTTPSConnection: prefer the context's check_hostname attribute over the constructor parameter (#22959)

Patch by Kurt Roeckx.

information.

same length.

This will create a venv using the interpreter specified by the PYTHON
variable for the Makefile that also install Sphinx. Typical usage is
expected to be:

  cd Doc
  make venv PYTHON=../python
  make html PYTHON=venv/bin/python3

automated process.

Python finalization.

Before the module kept a reference to the builtins module, but the module
attributes are cleared during Python finalization. Instead, keep directly a
reference to the open() function.

This enhancement is not perfect, calling tokenize.open() can still fail if
called very late during Python finalization.  Usually, the function is called
by the linecache module which is called to display a traceback or emit a
warning.

finalization.

Before the module kept a reference to the builtins module, but the module
attributes are cleared during Python finalization. Instead, keep directly a
reference to the open() function.

This enhancement is not perfect, calling tokenize.open() can still fail if
called very late during Python finalization.  Usually, the function is called
by the linecache module which is called to display a traceback or emit a
warning.

and case.  Edit some of the explanatory sentences and end all with a period.

event loop if a BaseException is raised, because the event loop is already
stopped.

Call _stop_accept_futures() before sestting the _closed attribute, otherwise
call_soon() raises an error.

Call _stop_accept_futures() before sestting the _closed attribute, otherwise
call_soon() raises an error.

written by Torsten Landschoff.

create_task(), call_at(), call_soon(), call_soon_threadsafe() and
run_in_executor() now raise an error if the event loop is closed.

* mock also resume_reading()
* ensure that resume_reading() is called

avoid attribute errors in destructors.