Fix: export data filename selection

[githeap]

Hello @erwanp . Looks like PyQt4 -> PyQt5 transition bug. Try to export data to file File menu -> Export data... -> Chose filename in file selection dialog -> press Save button. You get exception

An unhandled exception was raised: Traceback (most recent call last): File "./qtplaskin/main.py", line 633, in export_data .savedata(fname, self.location) File "./qtplaskin/mplwidget.py", line 233, in savedata with open(fname, "w") as fout: TypeError: expected str, bytes or os.PathLike object, not tuple

QtWidgets.QFileDialog.getSaveFileName returns tuple, where filename is the first element I found the following solution: https://stackoverflow.com/questions/43509220/qtwidgets-qfiledialog-getopenfilename-returns-a-tuple

UPD: Found two more instances of the same bug. I suggest, the way I used to unpack the first element of the tuple is more robust in case the function will return more than 2 elements in future . This syntax should work with all versions of Python 3 https://www.python.org/dev/peps/pep-3132/

[codecov[bot]]

Codecov Report

Merging #5 into master will not change coverage. The diff coverage is 0%.

@@           Coverage Diff           @@
##           master       #5   +/-   ##
=======================================
  Coverage   20.83%   20.83%           
=======================================
  Files          16       16           
  Lines        1704     1704           
=======================================
  Hits          355      355           
  Misses       1349     1349

Impacted Files	Coverage Δ
qtplaskin/main.py	19.95% <0%> (ø)	:arrow_up:

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[erwanp]

Hi ! I'm merging that ASAP. As I'm not actively maintening the package at the moment, do you want collaborator access to the project so you can push it yourself?

Edit: just did.