browsers.  Based on patch by Oleg Broytman.

browsers.  Based on patch by Oleg Broytman.

by representing the scale as float value internally in Tk.  tkinter.IntVar
now works if float value is set to underlying Tk variable.

by representing the scale as float value internally in Tk.  tkinter.IntVar
now works if float value is set to underlying Tk variable.

Patch by Xiang Zhang.

* Cannot seem to link directly to main options from the “unittest” module,
  because that module has its own set of options
* Mask out linking for options that no longer exist in Python 3

"()" format string creates an empty list of argument but requires extra work to
parse the format string.

PyType_Ready() sets the reference to &PyType_Type.

&PyType_Type cannot be resolved at compilation time (not on Windows?).

This implementation provides additional 10-20% speed boost for
asyncio programs.

The patch also fixes _asynciomodule.c to use Arguments Clinic, and
makes '_schedule_callbacks' an overridable method (as it was in 3.5).

from lib-dynload on install.