wxPython has been updated to 3.0 in Rawhide.  Unfortunately, openstv fails to launch with wxPython 3.0:

[talbert@localhost ~]$ openstv
/usr/lib/python2.7/site-packages/openstv/OpenSTV.py:893: wxPyDeprecationWarning: Call to deprecated item. 
  wx.InitAllImageHandlers()

(openstv:4542): GLib-GObject-WARNING **: The property GtkImageMenuItem:use-stock is deprecated and shouldn't be used anymore. It will be removed in a future version.

(openstv:4542): GLib-GObject-WARNING **: The property GtkSettings:gtk-menu-images is deprecated and shouldn't be used anymore. It will be removed in a future version.

(openstv:4542): GLib-GObject-WARNING **: The property GtkImageMenuItem:accel-group is deprecated and shouldn't be used anymore. It will be removed in a future version.
Traceback (most recent call last):
  File "/usr/bin/openstv", line 7, in <module>
    app = App(0)
  File "/usr/lib64/python2.7/site-packages/wx-3.0-gtk3/wx/_core.py", line 8628, in __init__
    self._BootstrapApp()
  File "/usr/lib64/python2.7/site-packages/wx-3.0-gtk3/wx/_core.py", line 8196, in _BootstrapApp
    return _core_.PyApp__BootstrapApp(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/openstv/OpenSTV.py", line 902, in OnInit
    self.frame = Frame(None)
  File "/usr/lib/python2.7/site-packages/openstv/OpenSTV.py", line 184, in __init__
    self.console.SetMaxLength(0)
  File "/usr/lib64/python2.7/site-packages/wx-3.0-gtk3/wx/_core.py", line 13339, in SetMaxLength
    return _core_.TextEntryBase_SetMaxLength(*args, **kwargs)
wx._core.PyAssertionError: C++ assertion "IsSingleLine()" failed at ./src/gtk/textctrl.cpp(847) in GetEditable(): shouldn't be called for multiline

(The GTK warnings are from wxWidgets and can probably be ignored.  I assume they'll be turned off before release.)

Debian has incorporated a patch which would probably resolve these issues:
https://sources.debian.net/data/main/o/openstv/1.6.1-1.1/debian/patches/wxpython3.0.patch