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I'm working with Plugins Builder to create a simple plugin with QGIS3 "SaveAttributes", I'm following the official tutorial on QGIS Tutorials.

I'm installed Python 3 and Python 2 is already installed with ArcGIS, I have installed also the PyQt5 and Qt Creator.(I give details because I think that the error was not provided by the code)

The error I got

TypeError: setText(self, str): argument 1 has unexpected type 'tuple' Traceback (most recent call last): File "C:/Users/REDA DRISSI/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\reda\module.py", line 190, in select_output_file self.dlg.lineEdit.setText(filename) TypeError: setText(self, str): argument 1 has unexpected type 'tuple'

For this code :

def select_output_file(self):
    filename = QFileDialog.getSaveFileName(self.dlg, "Select output file ","", '*.txt')
    self.dlg.lineEdit.setText(filename)

I tried to use str() function :

self.dlg.lineEdit.setText(str(filename))

Gives this Error:

OSError: [Errno 22] Invalid argument: "('C:/Users/REDA DRISSI/Desktop/DATA/finaldd/reda.txt', '*.txt')"

I think the problem is related to the default version of python used by windows and QVariant, but I don't know how to resolve the problem.

4

Try

self.dlg.lineEdit.setText(filename[0])

instead of

self.dlg.lineEdit.setText(filename)

Hope this answers your question.

  • Thanks for the answer. Can you elaborate on why this works better than the original code? A link to the relevant docs and an explanation of the return value of getSaveFileName would be really good. – Matthias Kuhn Apr 30 '18 at 10:20
  • for my test case it stored ('E:/test.txt', '*.txt') in filename but what you wanted was probably 'E:/test.txt' which could be accessed by filename[0] – Asad Abbas Apr 30 '18 at 10:44
  • if this answers your question please close this question by accepting this answer – Asad Abbas Apr 30 '18 at 10:46
  • Thanks a lot for your help,i tried to change in the resources.py PyQt5 instead of PyQt4, i used the documentation of the PyQt5 to solve the problem. – REDA DRISSI Apr 30 '18 at 14:24
1

QGIS 2 and QGIS 3 use PyQt4 and PyQt5, respectively. In PyQt4, QFileDialog.getSaveFileName() method returns filename string like "c:/path/to/file.txt". In PyQt5, that method returns a tuple contains file path and filter string like ("c:/path/to/file.txt", "*.txt"). So to get filename, you should use filename[0] in setText() method:

self.dlg.lineEdit.setText(filename[0])

Or, because getSaveFileName() method returns a tuple with two elements, you can use related line as @Matthias states in comments:

def select_output_file(self):
    filename, filter_string = QFileDialog.getSaveFileName(self.dlg, "Select output file ","", '*.txt')
    self.dlg.lineEdit.setText(filename) # without [0]

Strangely, Qt Documentation doesn't state that.

  • The PyQt signature differs from the Qt signature for this method, that's the reason for not stating that. What's not accurate here is the PyQt5 documentation for QFileDialog. – Matthias Kuhn Apr 30 '18 at 11:15
  • I usually use Qt Documentation and I was not aware of PyQt Docs. But I noticed that PyQt Docs is redirecting into Qt Docs. According to this statement, getSaveFileName() are not supported in PyQt5, but it works in QGIS 3. I'm confused. – Kadir Şahbaz Apr 30 '18 at 11:39
  • 1
    I don't like the PyQt5 documentation very much, so I also always refer to the Qt documentation which is 90% accurate, but still cannot be blamed for not being accurate on derived products ;) I think the statement you linked to basically said that the PyQt5 getSaveFileName() method was already available as getSaveFileNameAndFilter() in PyQt4. Sidenote, I'd probably fix this by using filename, filter_string = QFileDialog.getSaveFileName. – Matthias Kuhn Apr 30 '18 at 11:47

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