File "site-packages\electrum-3.1.2-py3.5.egg\electrum_gui\qt\qrcodewidget.py", line 60, in paintEvent
  File "site-packages\qrcode\main.py", line 410, in get_matrix
  File "site-packages\qrcode\main.py", line 78, in make
  File "site-packages\qrcode\main.py", line 147, in best_fit