Adding all the fields of layer to another using PyQGIS

Question

I try to add all the fields of layer X to layer Y. This is my code:

layerX = QgsProject.instance().mapLayersByName("layername1") 
layerY = QgsProject.instance().mapLayersByName("layername2") 
#read field name and type of layerX
fields = [ field.name() for field in layerX.fields() ] #list of all fields
fieldtype = [ field.typeName() for field in layerX.fields() ] #list of all fieldtypes
#add fields to layerY
i = 0
for f in fields:
####### Not part of my question from here....
#it's only about breaking (because I don't take field[0] which is the ID) and changing "Integer" to "Int"
 
 i = i + 1
 laenge = len(fields)
 if i == laenge: 
 break
 feldname = fields[i]
 if fieldtype[i] == "Integer":
 feldtyp = "Int"
 else:
 feldtyp = fieldtype[i]
####### Not part of my question .... to here
 qvaria = "QVariant."+feldtyp
 layerY.dataProvider().addAttributes([QgsField(feldname, QVariant.String)]) #WORKS
 layerY.dataProvider().addAttributes([QgsField(feldname, qvaria)]) #DOES NOT WORK 

It works perfectly if I type QVariant.String or QVariant.Int in the last function. If I autogenerate the same statement (using qvaria instead of QVariant.String), it returns the following error:

QgsField(): arguments did not match any overloaded call: #overload 1: argument 2 has unexpected type 'str' #overload 2: argument 1 has unexpected type 'str'

Do you know how I can make my script run? Is there an easier way to add all the fields from one to another layer?

Answer 1

layerX = QgsProject.instance().mapLayersByName("layername1") 
layerY = QgsProject.instance().mapLayersByName("layername2") 
layerY.dataProvider().addAttributes([field for field in layerX.fields() if field.name() not in ["fid"]])

No iteration needed.