File "site-packages\electrum-3.1.3-py3.5.egg\electrum_gui\qt\qrcodewidget.py", line 60, in paintEvent
  File "site-packages\qrcode\main.py", line 427, in get_matrix
  File "site-packages\qrcode\main.py", line 92, in make
  File "site-packages\qrcode\main.py", line 164, in best_fit