A long time ago I wrote a plugin for my own use. The plugin works fine in Qgis2.18 but not in Qgis3.1 I used the script 2to3 and solved most problems. The only problem I am left with is the following.

First my code that i use.

import os.path

CSVDIR = 'd:/QGIS/Temp_map/TestCSV/2018/'
DESTDIR = 'd:/QGIS/Temp_map/TestSHP/2018/'

if not os.path.exists(DESTDIR):

for root, dirs, files in os.walk(CSVDIR):
    for file in files:
        if file.endswith('.csv'):
            fullname = os.path.join(root, file).replace('/', '/')
            filename = os.path.splitext(os.path.basename(fullname))[0]
            uri = 'file:///%s?crs=%s&delimiter=%s&xField=%s&yField=%s&decimal=%s&useHeader=no&' % (fullname, 'EPSG:4326', ';', 'Field_7', 'Field_6', ',')
            layer = QgsVectorLayer(uri, 'my_layer', 'delimitedtext')
            QgsVectorFileWriter.writeAsVectorFormat(layer, DESTDIR + filename + '.shp', 'CP1250', None, 'ESRI Shapefile')


    QMessageBox.information(iface.mainWindow(), "CSV naar Shape",
        "Uw Shapefiles zijn aangemaakt!", QMessageBox.Ok )

This code works in Qgis2.18 but give the following error in Qgis3.0

Traceback (most recent call last):
  File "C:\PROGRA~1\QGIS3~1.0\apps\Python36\lib\code.py", line 91, in runcode
  exec(code, self.locals)
  File "<input>", line 1, in <module>
  File "<string>", line 24, in <module>
  TypeError: QgsVectorFileWriter.writeAsVectorFormat(): arguments did not match any overloaded call:
  overload 1: argument 4 has unexpected type 'NoneType'
  overload 2: argument 4 has unexpected type 'NoneType'
  overload 3: argument 3 has unexpected type 'str'

What can i do to make this working ??


writeAsVectorFormat() function expects QgsCoordinateReferenceSystemfor argument 4.

Replacing None with layer.crs() will probably solve your problem.

For more information, refer to QgsVectorFileWriter Class Reference

  • @NvBgm As this answer solved your problem, please accept it by clicking the big tick. – user2856 Apr 19 '18 at 1:54

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