[GIS] AttributeError: ‘QgsFields’ object has no attribute ‘itervalues’

aptanapyqgisqgis

First of all, the code which is below gives me the attribute names of a shapefile correctly if I use PyScripter IDE:

from qgis.core import *
from qgis.gui import *
from PyQt4.QtCore import *
from PyQt4.QtGui import *

QgsApplication.setPrefixPath("C:/OSGeo4W/apps/qgis-dev", True)
QgsApplication.initQgis() 

layer = QgsVectorLayer("C:/istanbul/istanbul_geo-wgs84.shp", "sero", "ogr")

fields = layer.pendingFields()

for field in fields.itervalues():
    print "Name:%s Type:%s, Length:%s" % ( field.name(), field.typeName(), field.length())

If I want to access attribute names of a shapefile, Aptana Studio gives me an error message below:

    for field in fields.itervalues():
AttributeError: 'QgsFields' object has no attribute 'itervalues'
d:\src\qgis\src\core\qgsvectorlayer.cpp(188) : (QgsVectorLayer::~QgsVectorLayer) entered.

According to the console in Aptana Studio, my system can read vector layers:

d:\src\qgis\src\core\qgsvectorlayer.cpp(1628) : (QgsVectorLayer::setDataProvider)      Extent of layer: 28.0019662445739925,40.7878698688807120 : 29.9327258493754194,41.5270420672795026

d:\src\qgis\src\core\qgscoordinatereferencesystem.cpp(449) : (QgsCoordinateReferenceSystem::createFromWkt) authid recognized as EPSG:4326

I used OSGeo4W installer and configured my IDE based on Nathan's expressions:

How to add QGIS Python API Intellisense support in Aptana Studio3/Pydev

and finally my "aptana.bat" file to initialize the IDE:

@ECHO OFF
set OSGEO4W_ROOT=C:\OSGeo4W
call "%OSGEO4W_ROOT%"\bin\o4w_env.bat
call "%OSGEO4W_ROOT%"\apps\grass\grass-6.4.3\etc\env.bat
set PATH=%OSGEO4W_ROOT%\bin;%OSGEO4W_ROOT%\apps\qgis-dev\bin;%PATH%
set PYTHONHOME=%OSGEO4W_ROOT%\apps\Python27
set PYTHONPATH=%OSGEO4W_ROOT%\apps\qgis-dev\python
set QGISHOME=%OSGEO4W_ROOT%\apps\qgis-dev
call "C:\Users\Geomatics\AppData\Local\Aptana Studio 3\studio3.bat" %*

How are we gonna tackle this problem? Thanks in advance…

Best Answer

The QgsFields object does not implement the itervalues() method. You can easily iterate manually:

for i in range(fields.count()):
    field = fields[i]
    print "Name:%s Type:%s, Length:%s" % ( field.name(), field.typeName(), field.length())
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