Facing the same traceback while hitting the button 'Save QRCode' in Ubuntu 
17.10 and Ubuntu 18.04 LTS. Attached is a patch, which fixed the issue for me. 
Because Python is a scripting language, you can apply that patch directly 
without any recompiling:
sudo patch -p0 <./filename_tuple.patch

The issue was introduced with the change of the Python binding from Qt4
to Qt5. In the head of development (branch: trunk), this issue is fixed
already with revision 27 (for Save via saveCode) and 24 (for Open via
decodeFile). Although I solved this issue independently thanks to
<https://stackoverflow.com/a/37822182>, I aligned the attached patch
with the current trunk.

When it comes to your Wi-Fi typing issue, I am able to reproduce that
even with the latest tool QtQR (revision 28) and latest library qr-tools
(revision 29). Therefore, I opened a new bug report at
<https://bugs.launchpad.net/qr-tools/+bug/1761713>.

** Patch added: "filename_tuple.patch"
   
https://bugs.launchpad.net/ubuntu/+source/qr-tools/+bug/1729066/+attachment/5103826/+files/filename_tuple.patch

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Title:
  [Kubuntu 17.10 / PPA daily] QtQr crashes while saving to PNG

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