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I am trying to use the 'merge vector layers' tool in PyQGIS to merge all of the layers in my QGIS project into one shapefile, as part of a larger script I am developing. I tried this script, but I get an error related to the input layers. I am using QGIS 3.0.0.

processing.algorithmHelp('native:mergevectorlayers')
input = iface.mapCanvas().layers()  
processing.run('native:mergevectorlayers',{'LAYERS':input,'CRS':4326,'OUTPUT':'C:\Users\hp\Desktop\COOPI\GIS_Data\CWW_Predictive_Targeting\GEOREF_HH_GPS_Data\Shapefiles\Merged\TA_Mponda_GVH_Bolera_malunga.shp'})

This is the error I get:

Traceback (most recent call last):
  File "C:\OSGEO4~1\apps\Python36\lib\code.py", line 64, in runsource
    code = self.compile(source, filename, symbol)
  File "C:\OSGEO4~1\apps\Python36\lib\codeop.py", line 168, in __call__
    return _maybe_compile(self.compiler, source, filename, symbol)
  File "C:\OSGEO4~1\apps\Python36\lib\codeop.py", line 99, in _maybe_compile
    raise err1
  File "C:\OSGEO4~1\apps\Python36\lib\codeop.py", line 87, in _maybe_compile
    code1 = compiler(source + "\n", filename, symbol)
  File "C:\OSGEO4~1\apps\Python36\lib\codeop.py", line 133, in __call__
    codeob = compile(source, filename, symbol, self.flags, 1)
  File "<input>", line 1
SyntaxError: (unicode error) 'unicodeescape' codec can't decode bytes in position 2-3: truncated \UXXXXXXXX escape
  • use double slash in yout paths – Fran Raga Jul 18 '18 at 6:57
  • Unfortunately I am still getting an error when I use the double slashes.. – J Clifford Jul 18 '18 at 8:22
  • Traceback (most recent call last): File "C:\OSGEO4~1\apps\Python36\lib\code.py", line 91, in runcode exec(code, self.locals) File "<input>", line 1, in <module> File "C:/OSGEO4~1/apps/qgis/./python/plugins\processing\tools\general.py", line 84, in run return Processing.runAlgorithm(algOrName, parameters, onFinish, feedback, context) File "C:/OSGEO4~1/apps/qgis/./python/plugins\processing\core\Processing.py", line 190, in runAlgorithm raise QgsProcessingException(msg) _core.QgsProcessingException: There were errors executing the algorithm. – J Clifford Jul 18 '18 at 8:43
  • It worked with single forward slashes / in the file paths – J Clifford Jul 18 '18 at 9:25
  • @J Clifford, please provide that finding as an answer. – artwork21 Jul 20 '18 at 12:14
1

The code works when using a single forward slash (/) in the file paths

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