After upgrade from Pycharm 2017.2.3 to Pycharm 2017.1.4 Pycharm\'s Debugger suggested to build cpython (or sth associated with it):
Pycharm 2017.2.3
Pycharm 2017.1.4
p
Mine worked after I removed pyqt5 bindings.
sudo apt-get remove python3-pyqt5
This wasn't happening to me because of building cpython. It was because I had installed an unrelated program. Hope it helps.