AttributeError: 'QgsRasterLayer' object has no attribute 'pendingFields'

Question

Remember i am using Python Version 3.6.2 QGIS Version 3.2

while running my code i am getting this error:

fields = selectedLayer.pendingFields()
AttributeError: 'QgsRasterLayer' object has no attribute 'pendingFields

if i am using fields() instead of pendingFields() because of qgis version 3x

getting this error:

fields = selectedLayer.fields()
AttributeError: 'QgsRasterLayer' object has no attribute 'fields

i am new in this field so please tell me properly what should i do

here is my code:

 filename = self.dlg.lineEdit.text()
 output_file = open(filename, 'w')
 selectedLayerIndex = self.dlg.comboBox.currentIndex()
 selectedLayer = layers[selectedLayerIndex]
 fields = selectedLayer.pendingFields()
 fieldnames = [field.name() for field in fields]
 for f in selectedLayer.getFeatures():
 line = ','.join(unicode(f[x]) for x in fieldnames) + '\n'
 unicode_line = line.encode('utf-8')
 output_file.write(unicode_line)
 output_file.close() 

• Rahul Verma: i just simply created a plugin it didn't ask for QgsRasterLayer or QgsVectorLayer. from qt creator i design my plugin to take the layers raster or vector from my local system and it save output file but when ever i am saving output file i am getting this error
• Rahul Verma: i am absolute beginners in QGIS so i am not getting it well what i want to do is ----- i created my plugin i just want to add some code in my mainPlugin.py file like print('hello') and want to run this in qgis so what should i do.

Answer 1

Your code will not work with raster layers as they have neither fields (QGIS doesn't support raster attribute tables - link) nor features.

fields (pendingFields in 2x) and getFeatures are methods of the QgsVectorLayer class.

So test if your layer has a fields method (i.e if hasattr(selectedLayer, 'fields'): etc... and ignore it if it doesn't. i.e

filename = self.dlg.lineEdit.text()
selectedLayerIndex = self.dlg.comboBox.currentIndex()
selectedLayer = layers[selectedLayerIndex]
if hasattr(selectedLayer, 'fields'):
 fields = selectedLayer.pendingFields()
 fieldnames = [field.name() for field in fields]
 for f in selectedLayer.getFeatures():
 etc...

• Rahul Verma: error gone but its not saving my output file. will you forgot to add output_file = open(filename, 'w') in second line. After adding it on 2nd line output file showing in my system
• user2856: The etc... in my code snippet represents the rest of your code, including the output. I didn't forget it, I deliberately didn't include it as it's not relevant to the question and to keep my answer simple.