Ошибка при выполнении сценария python qgis

Every time I run a python script from the script editor in QGIS 2.18.3 I get this error message

After I click on «close program» the script continues like there was no error message. In total, I get a few of them, more or less one for every step of the code. The thing is that this is not a «really» error message because the code continues to run normally after I click on «close program» until the code finishes, and there is nothing wrong with the outputs of the code. The only annoying thing is that I can’t «leave» the code to run by itself and I need to monitor it in order to click every time on «close program» so that the code will continue.
Does somebody had the same issue?

an example code is the following. Is it iterate over folders and does some calculation on landsat band 10. Every time it produce a new file (output) I get the error message.

##calibrate landsat bands v8=name
##Select_directory=Folder

import glob, os, os.path, math
import glob, os, os.path, math
from PyQt4.QtCore import QFileInfo
from qgis.core import QgsRasterLayer, QgsRectangle
#Select_directory = r"C:UsersRanDesktopMannacalibrate LS8testing iterating"
x = "SUN_ELEVATION"
wrs_path = "WRS_PATH"
wrs_row = "WRS_ROW"
date_of_image ="DATE_ACQUIRED"  
#create a list of the directories in the folder
folder_list=[name for name in os.listdir(Select_directory) if os.path.isdir(os.path.join(Select_directory, name))] #list the folder names
if len(folder_list) > 0:
    a=0

    for folder in folder_list: #folder= name of a folder with only files
        folderpath = os.path.join(Select_directory,folder_list[a]) #the path to a specific folder
        a+=1
        os.chdir(folderpath)
        name_list=[] #list of file names
        for raster in glob.glob("*.tif"): #raster = tif files in specific folder
            name_list.append(raster[:21])   

        unique = set(name_list)   #get only unique values

        for c in unique: #c= unique name of landsat image (include all bands)
            for b in os.listdir(folderpath): #b= file name in a specific folder
                if (c+"_MTL") in b:
                    i = os.path.join(folderpath,b) #this expression :[source+"\"+folder] is a path to a folder that has rasters
                    z = open(i,'r')             

                    for line, text in enumerate(z):  
                        if x in text:                
                            y = text.split("=")
                            SUN_ELEVATION = (y[1])


                        elif wrs_path in text:
                            yy = text.split("=")
                            WRS_PATH = yy[1]
                            path_temp = WRS_PATH.strip()
                            WRS_PATH1 = path_temp.replace(" ","")           
                            if len(WRS_PATH1)==2: 
                                WRS_PATH1 = "0"+WRS_PATH1

                        elif wrs_row in text:   
                            yyy = text.split("=")
                            WRS_ROW = yyy[1]
                            row_temp = WRS_ROW.strip()
                            WRS_ROW1 = row_temp.replace(" ","")
                            if len(WRS_ROW1)==2: #this is to check if the row is 2 or 3 digits
                                WRS_ROW1 = "0"+WRS_ROW1

                        elif date_of_image in text:
                            yyyy = text.split("=")
                            yyyyy = yyyy[1].split("-")
                            day = yyyyy[2]
                            month = yyyyy[1]
                            year = yyyyy[0][-2:]
                            DATE_ACQUIRED = year+month+day  


            image_suffix = "ls8_{}{}_{}".format(WRS_PATH1,WRS_ROW1,DATE_ACQUIRED)
            SUN_ELEVATION = float(y[1])
            SUN_ELEVATION1 = math.radians(SUN_ELEVATION)
            syntax = '(A>0.001)*10000*(A*0.00002-0.1)/sin('+str(SUN_ELEVATION1)+')'
            os.chdir(folderpath)

            for raster in glob.glob("*.tif"):
                if raster[:25]==c+"_B10":
                    outputName = os.path.join(folderpath,"cal_"+c+"_B10") 
                    fileInfo = QFileInfo(raster)
                    baseName = fileInfo.baseName()
                    rlayer = QgsRasterLayer(raster, baseName)
                    outputs_GDALOGRRASTERCALCULATOR_1=processing.runalg('gdalogr:rastercalculator', rlayer,'1',None,'1',None,'1',None,'1',None,'1',None,'1','(A>0)*(1000*(1321.0789/(log(774.8853/(A*0.0003342+0.1)+1))-273.15))','0',4,None,outputName)

Every time I run a python script from the script editor in QGIS 2.18.3 I get this error message

After I click on «close program» the script continues like there was no error message. In total, I get a few of them, more or less one for every step of the code. The thing is that this is not a «really» error message because the code continues to run normally after I click on «close program» until the code finishes, and there is nothing wrong with the outputs of the code. The only annoying thing is that I can’t «leave» the code to run by itself and I need to monitor it in order to click every time on «close program» so that the code will continue.
Does somebody had the same issue?

an example code is the following. Is it iterate over folders and does some calculation on landsat band 10. Every time it produce a new file (output) I get the error message.

##calibrate landsat bands v8=name
##Select_directory=Folder

import glob, os, os.path, math
import glob, os, os.path, math
from PyQt4.QtCore import QFileInfo
from qgis.core import QgsRasterLayer, QgsRectangle
#Select_directory = r"C:UsersRanDesktopMannacalibrate LS8testing iterating"
x = "SUN_ELEVATION"
wrs_path = "WRS_PATH"
wrs_row = "WRS_ROW"
date_of_image ="DATE_ACQUIRED"  
#create a list of the directories in the folder
folder_list=[name for name in os.listdir(Select_directory) if os.path.isdir(os.path.join(Select_directory, name))] #list the folder names
if len(folder_list) > 0:
    a=0

    for folder in folder_list: #folder= name of a folder with only files
        folderpath = os.path.join(Select_directory,folder_list[a]) #the path to a specific folder
        a+=1
        os.chdir(folderpath)
        name_list=[] #list of file names
        for raster in glob.glob("*.tif"): #raster = tif files in specific folder
            name_list.append(raster[:21])   

        unique = set(name_list)   #get only unique values

        for c in unique: #c= unique name of landsat image (include all bands)
            for b in os.listdir(folderpath): #b= file name in a specific folder
                if (c+"_MTL") in b:
                    i = os.path.join(folderpath,b) #this expression :[source+"\"+folder] is a path to a folder that has rasters
                    z = open(i,'r')             

                    for line, text in enumerate(z):  
                        if x in text:                
                            y = text.split("=")
                            SUN_ELEVATION = (y[1])


                        elif wrs_path in text:
                            yy = text.split("=")
                            WRS_PATH = yy[1]
                            path_temp = WRS_PATH.strip()
                            WRS_PATH1 = path_temp.replace(" ","")           
                            if len(WRS_PATH1)==2: 
                                WRS_PATH1 = "0"+WRS_PATH1

                        elif wrs_row in text:   
                            yyy = text.split("=")
                            WRS_ROW = yyy[1]
                            row_temp = WRS_ROW.strip()
                            WRS_ROW1 = row_temp.replace(" ","")
                            if len(WRS_ROW1)==2: #this is to check if the row is 2 or 3 digits
                                WRS_ROW1 = "0"+WRS_ROW1

                        elif date_of_image in text:
                            yyyy = text.split("=")
                            yyyyy = yyyy[1].split("-")
                            day = yyyyy[2]
                            month = yyyyy[1]
                            year = yyyyy[0][-2:]
                            DATE_ACQUIRED = year+month+day  


            image_suffix = "ls8_{}{}_{}".format(WRS_PATH1,WRS_ROW1,DATE_ACQUIRED)
            SUN_ELEVATION = float(y[1])
            SUN_ELEVATION1 = math.radians(SUN_ELEVATION)
            syntax = '(A>0.001)*10000*(A*0.00002-0.1)/sin('+str(SUN_ELEVATION1)+')'
            os.chdir(folderpath)

            for raster in glob.glob("*.tif"):
                if raster[:25]==c+"_B10":
                    outputName = os.path.join(folderpath,"cal_"+c+"_B10") 
                    fileInfo = QFileInfo(raster)
                    baseName = fileInfo.baseName()
                    rlayer = QgsRasterLayer(raster, baseName)
                    outputs_GDALOGRRASTERCALCULATOR_1=processing.runalg('gdalogr:rastercalculator', rlayer,'1',None,'1',None,'1',None,'1',None,'1',None,'1','(A>0)*(1000*(1321.0789/(log(774.8853/(A*0.0003342+0.1)+1))-273.15))','0',4,None,outputName)

I was fortunate enough to get in touch with the author of the book so I will share his response here:

I suspect I may know what the problem is…after looking at this
reader’s problems in more depth, I’ve discovered that something has
changed in newer versions of QGIS, and the example code no longer
works as it is written. In technical terms, it seems that you now
need to instantiate the QApplication object before making the call to
QgsApplication.initQgis() — the example program in the book
instantiates the QApplication object after calling
QgsApplication.initQgis(), which causes the program to crash. To fix
this, change the main() function to look like the following:

def main():
    """  Our main program.
    """
    app = QApplication(sys.argv)
    QgsApplication.setPrefixPath(os.environ['QGIS_PREFIX'],True)
    QgsApplication.initQgis()

    viewer = MapViewer("C:/folder/shapefile.shp")
    viewer.show()

    app.exec_()

    QgsApplication.exitQgis()

As you can see, I’ve moved the «app = QApplication(sys.argv)» line to the top.

Important Note: Make sure that forward slashes are used in viewer = MapViewer("C:/folder/shapefile.shp") — using a backslash will result in an error message stating that the shapefile is invalid.

I also thought it would be worth mentioning that none of the above fixes (comments on the question) were necessary. So, the script will work if the paths are defined as follows:

SET OSGEO4W_ROOT=C:OSGeo4W64
SET QGIS_PREFIX=%OSGEO4W_ROOT%appsqgis
SET PATH=%PATH%;%QGIS_PREFIX%bin
SET PYTHONPATH=%QGIS_PREFIX%python;%PYTHONPATH%

Then, the entire script looks like this:

import sys
import os
from qgis.core import *
from qgis.gui import *
from PyQt4.QtGui import *
from PyQt4.QtCore import Qt



#############################################################################


class MapViewer(QMainWindow):
    def __init__(self, shapefile):
        QMainWindow.__init__(self)
        self.setWindowTitle("Map Viewer")

        canvas = QgsMapCanvas()
        canvas.useImageToRender(False)
        canvas.setCanvasColor(Qt.white)
        canvas.show()

        layer = QgsVectorLayer(shapefile, "layer1", "ogr")
        if not layer.isValid():
            raise IOError("Invalid shapefile")

        QgsMapLayerRegistry.instance().addMapLayer(layer)
        canvas.setExtent(layer.extent())
        canvas.setLayerSet([QgsMapCanvasLayer(layer)])

        layout = QVBoxLayout()
        layout.addWidget(canvas)

        contents = QWidget()
        contents.setLayout(layout)
        self.setCentralWidget(contents)

#############################################################################


def main():
    """  Our main program.
    """
    app = QApplication(sys.argv)
    QgsApplication.setPrefixPath(os.environ['QGIS_PREFIX'],True)
    QgsApplication.initQgis()

    viewer = MapViewer("C:/folder/shapefile.shp")
    viewer.show()

    app.exec_()

    QgsApplication.exitQgis()

#############################################################################

if __name__ == "__main__":
    main()

Execute it in the OSGEO4W Shell using the following command:

python "C:script.py"

Lastly, note that at the time of this writing, the script works properly and launches a viewer showing the shapefile referenced, but returns a few errors in the shell that do not seem to be problematic:

ERROR: Opening of authentication db FAILED
ERROR: Unable to establish authentication database connection
ERROR: Auth db could not be created and opened
QSqlDatabasePrivate::database: unable to open database: "unable to open database file Error opening database"
ERROR: Opening of authentication db FAILED

Much thanks to the author Erik Westra for providing me with this solution.

Hello.
I have QGIS 2.12, running under Windows 8.1.
I have PostGIS connection, calling in russian «Бузулукский бор».
I configure plugin as described on screenshot:

I trying search for some text,

but this error occurs:

Ошибка при выполнении сценария Python: 

TypeError: missing dsn and no parameters 
Traceback (most recent call last):
  File "C:/Users/Andrew/.qgis2/python/pluginsLayerMetadataSearchgeo_cat_dialog.py", line 94, in search
    cur = self._db_cur()
  File "C:/Users/Andrew/.qgis2/python/pluginsLayerMetadataSearchgeo_cat_dialog.py", line 72, in _db_cur
    con = get_connection(con_info)
  File "C:/Users/Andrew/.qgis2/python/pluginsLayerMetadataSearchdbutils.py", line 32, in get_connection
    conn = psycopg2.connect(**conn_info)
  File "d:PROGRA~2QGISLY~1appsPython27libsite-packagespsycopg2__init__.py", line 159, in connect
    raise TypeError('missing dsn and no parameters')
TypeError: missing dsn and no parameters


Версия Python: 2.7.5 (default, May 15 2013, 22:44:16) [MSC v.1500 64 bit (AMD64)] 
Версия: 2.12.1-Lyon Lyon, 16760fd 

Python Path:
C:/Users/Andrew/.qgis2/python/pluginsprocessing
d:/PROGRA~2/QGISLY~1/apps/qgis/./python
C:/Users/Andrew/.qgis2/python
C:/Users/Andrew/.qgis2/python/plugins
d:/PROGRA~2/QGISLY~1/apps/qgis/./python/plugins
d:PROGRA~2QGISLY~1appsPython27libsite-packagesmatplotlib-1.3.1-py2.7-win-amd64.egg
d:PROGRA~2QGISLY~1appsPython27libsite-packagesnose-1.3.3-py2.7.egg
d:PROGRA~2QGISLY~1appsPython27libsite-packagestornado-4.0.1-py2.7-win-amd64.egg
d:PROGRA~2QGISLY~1appsPython27libsite-packagesbackports.ssl_match_hostname-3.4.0.2-py2.7.egg
d:PROGRA~2QGISLY~1appsPython27libsite-packagescertifi-14.05.14-py2.7.egg
d:PROGRA~2QGISLY~1binpython27.zip
d:PROGRA~2QGISLY~1appsPython27DLLs
d:PROGRA~2QGISLY~1appsPython27lib
d:PROGRA~2QGISLY~1appsPython27libplat-win
d:PROGRA~2QGISLY~1appsPython27liblib-tk
d:PROGRA~2QGISLY~1bin
d:PROGRA~2QGISLY~1appsPython27
d:PROGRA~2QGISLY~1appsPython27libsite-packages
d:PROGRA~2QGISLY~1appsPython27libsite-packagesPIL
d:PROGRA~2QGISLY~1appsPython27libsite-packagesjinja2-2.7.2-py2.7.egg
d:PROGRA~2QGISLY~1appsPython27libsite-packagesmarkupsafe-0.23-py2.7-win-amd64.egg
d:PROGRA~2QGISLY~1appsPython27libsite-packagespytz-2012j-py2.7.egg
d:PROGRA~2QGISLY~1appsPython27libsite-packageswin32
d:PROGRA~2QGISLY~1appsPython27libsite-packageswin32lib
d:PROGRA~2QGISLY~1appsPython27libsite-packagesPythonwin
d:PROGRA~2QGISLY~1appsPython27libsite-packagesShapely-1.2.18-py2.7-win-amd64.egg
d:PROGRA~2QGISLY~1appsPython27libsite-packagessix-1.3.0-py2.7.egg
d:PROGRA~2QGISLY~1appsPython27libsite-packageswx-2.8-msw-unicode
d:PROGRA~2QGISLY~1appsPython27libsite-packagesxlrd-0.9.2-py2.7.egg
d:PROGRA~2QGISLY~1appsPython27libsite-packagesxlwt-0.7.5-py2.7.egg
C:/Users/Andrew/.qgis2//python
d:PROGRA~2QGISLY~1appsqgispythonpluginsfToolstools
D:/Maps/PostGIS/Forestry

Вернуться в Администрирование

Кто сейчас на конференции

Сейчас этот форум просматривают: нет зарегистрированных пользователей и гости: 0

I’ve been using QGIS for a while and haven’t had any major issues so far, but now I am getting the following Python error messages and certain plugins won’t work. Any Ideas?

Failed to open Python console:


Traceback (most recent call last):
  File "", line 2, in 
  File "/Applications/QGIS.app/Contents/MacOS/../Resources/python/console/console.py", line 46, in show_console
    _console = PythonConsole(parent)
  File "/Applications/QGIS.app/Contents/MacOS/../Resources/python/console/console.py", line 83, in __init__
    self.console = PythonConsoleWidget(self)
  File "/Applications/QGIS.app/Contents/MacOS/../Resources/python/console/console.py", line 109, in __init__
    self.shell = ShellScintilla(self)
  File "/Applications/QGIS.app/Contents/MacOS/../Resources/python/console/console_sci.py", line 86, in __init__
    self.refreshSettingsShell()
  File "/Applications/QGIS.app/Contents/MacOS/../Resources/python/console/console_sci.py", line 141, in refreshSettingsShell
    self.setCaretForegroundColor(cursorColor)
TypeError: setCaretForegroundColor(self, QColor): argument 1 has unexpected type 'unicode'


Python version:
2.7.10 (default, Jul 30 2016, 18:31:42) 
[GCC 4.2.1 Compatible Apple LLVM 8.0.0 (clang-800.0.34)]

QGIS version:
2.18.0 'Las Palmas', exported

Python path:
['/Users/Harry/.qgis2/python/plugins/processing', '/Applications/QGIS.app/Contents/MacOS/../Resources/python', u'/Users/Harry/.qgis2/python', u'/Users/Harry/.qgis2/python/plugins', '/Applications/QGIS.app/Contents/MacOS/../Resources/python/plugins', '/Library/Frameworks/SQLite3.framework/Versions/C/Python/2.7', '/Library/Frameworks/GEOS.framework/Versions/3/Python/2.7/site-packages', '/Library/Python/2.7/site-packages/scipy-override', '/Library/Python/2.7/site-packages/numpy-override', '/Library/Python/2.7/site-packages/matplotlib-override', '/Library/Frameworks/GDAL.framework/Versions/2.1/Python/2.7/site-packages', '/Library/Python/2.7/site-packages/PySAL-1.12.0-py2.7.egg', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python27.zip', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-darwin', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac/lib-scriptpackages', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-old', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload', '/Library/Python/2.7/site-packages', '/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python', '/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/PyObjC', u'/Users/Harry/.qgis2//python', '/Users/Harry/.qgis2/python/plugins/gearthview/ext-libs', u'/Users/Harry/Documents/Work/RCA/10.yr_2/ADS_3/mapping/qgs']

I also get this error when trying to run Cartographic Line Generalization plugin:

2016-12-07T15:01:02 1   
Traceback (most recent call last):
File "/Users/Harry/.qgis2/python/plugins/CartoLineGen-master/cartolinegen.py", line 210, in run
                self.count_vertices()
File "/Users/Harry/.qgis2/python/plugins/CartoLineGen-master/cartolinegen.py", line 234, in count_vertices
                feat = inLayer.getFeatures()
AttributeError: 'QgsRasterLayer' object has no attribute 'getFeatures'

Installed QGIS 3.0 today. On startup receiving this error

Python error: Couldn’t load plugin’processing’ See message log (Python Error) for more details.

Python error log:
2018-02-26T16:08:39 WARNING Traceback (most recent call last):
File «C:/OSGEO4~1/apps/qgis/./pythonqgisutils.py», line 311, in loadPlugin
import(packageName)
File «C:/OSGEO4~1/apps/qgis/./pythonqgisutils.py», line 664, in import
mod = _builtin_import(name, globals, locals, fromlist, level)
File «C:/OSGEO4~1/apps/qgis/./python/pluginsprocessing_init__.py», line 29, in <module>
from processing.tools.general import * # NOQA
File «C:/OSGEO4~1/apps/qgis/./pythonqgisutils.py», line 664, in import
mod = _builtin_import(name, globals, locals, fromlist, level)
File «C:/OSGEO4~1/apps/qgis/./python/pluginsprocessingtoolsgeneral.py», line 39, in <module>
from processing.core.Processing import Processing
File «C:/OSGEO4~1/apps/qgis/./pythonqgisutils.py», line 664, in _import
mod = _builtin_import(name, globals, locals, fromlist, level)
File «C:/OSGEO4~1/apps/qgis/./python/pluginsprocessingcoreProcessing.py», line 57, in <module>
from processing.algs.qgis.QgisAlgorithmProvider import QgisAlgorithmProvider # NOQA
File «C:/OSGEO4~1/apps/qgis/./pythonqgisutils.py», line 664, in _import
mod = _builtin_import(name, globals, locals, fromlist, level)
File «C:/OSGEO4~1/apps/qgis/./python/pluginsprocessingalgsqgisQgisAlgorithmProvider.py», line 41, in <module>
from .QgisAlgorithm import QgisAlgorithm
File «C:/OSGEO4~1/apps/qgis/./pythonqgisutils.py», line 664, in _import
mod = _builtin_import(name, globals, locals, fromlist, level)
File «C:/OSGEO4~1/apps/qgis/./python/pluginsprocessingalgsqgisQgisAlgorithm.py», line 30, in <module>
from processing.algs.help import shortHelp
File «C:/OSGEO4~1/apps/qgis/./pythonqgisutils.py», line 664, in _import
mod = _builtin_import(name, globals, locals, fromlist, level)
File «C:/OSGEO4~1/apps/qgis/./python/pluginsprocessingalgshelp_init__.py», line 28, in <module>
import yaml
File «C:/OSGEO4~1/apps/qgis/./pythonqgisutils.py», line 664, in _import
mod = _builtin_import(name, globals, locals, fromlist, level)
ImportError: bad magic number in ‘yaml’: b’x03xf3rn’

import sys
import os
from qgis.core import *
from qgis.gui import *
from PyQt4.QtGui import *
from PyQt4.QtCore import Qt



#############################################################################


class MapViewer(QMainWindow):
    def __init__(self, shapefile):
        QMainWindow.__init__(self)
        self.setWindowTitle("Map Viewer")

        canvas = QgsMapCanvas()
        canvas.useImageToRender(False)
        canvas.setCanvasColor(Qt.white)
        canvas.show()

        layer = QgsVectorLayer(shapefile, "layer1", "ogr")
        if not layer.isValid():
            raise IOError("Invalid shapefile")

        QgsMapLayerRegistry.instance().addMapLayer(layer)
        canvas.setExtent(layer.extent())
        canvas.setLayerSet([QgsMapCanvasLayer(layer)])

        layout = QVBoxLayout()
        layout.addWidget(canvas)

        contents = QWidget()
        contents.setLayout(layout)
        self.setCentralWidget(contents)

#############################################################################


def main():
    """  Our main program.
    """
    QgsApplication.setPrefixPath(os.environ['QGIS_PREFIX'], True)
    QgsApplication.initQgis()

    app = QApplication(sys.argv)

    viewer = MapViewer("C:/folder/shapefile.shp")
    viewer.show()

    app.exec_()

    QgsApplication.exitQgis()

#############################################################################

if __name__ == "__main__":
    main()

SET OSGEO4W_ROOT=C:OSGeo4W64
SET QGIS_PREFIX=%OSGEO4W_ROOT%appsqgis
SET PATH=%PATH%;%QGIS_PREFIX%bin
SET PYTHONPATH=%QGIS_PREFIX%python;%PYTHONPATH%

2 ответа

Лучший ответ

def main():
    """  Our main program.
    """
    app = QApplication(sys.argv)
    QgsApplication.setPrefixPath(os.environ['QGIS_PREFIX'],True)
    QgsApplication.initQgis()

    viewer = MapViewer("C:/folder/shapefile.shp")
    viewer.show()

    app.exec_()

    QgsApplication.exitQgis()

SET OSGEO4W_ROOT=C:OSGeo4W64
SET QGIS_PREFIX=%OSGEO4W_ROOT%appsqgis
SET PATH=%PATH%;%QGIS_PREFIX%bin
SET PYTHONPATH=%QGIS_PREFIX%python;%PYTHONPATH%

import sys
import os
from qgis.core import *
from qgis.gui import *
from PyQt4.QtGui import *
from PyQt4.QtCore import Qt



#############################################################################


class MapViewer(QMainWindow):
    def __init__(self, shapefile):
        QMainWindow.__init__(self)
        self.setWindowTitle("Map Viewer")

        canvas = QgsMapCanvas()
        canvas.useImageToRender(False)
        canvas.setCanvasColor(Qt.white)
        canvas.show()

        layer = QgsVectorLayer(shapefile, "layer1", "ogr")
        if not layer.isValid():
            raise IOError("Invalid shapefile")

        QgsMapLayerRegistry.instance().addMapLayer(layer)
        canvas.setExtent(layer.extent())
        canvas.setLayerSet([QgsMapCanvasLayer(layer)])

        layout = QVBoxLayout()
        layout.addWidget(canvas)

        contents = QWidget()
        contents.setLayout(layout)
        self.setCentralWidget(contents)

#############################################################################


def main():
    """  Our main program.
    """
    app = QApplication(sys.argv)
    QgsApplication.setPrefixPath(os.environ['QGIS_PREFIX'],True)
    QgsApplication.initQgis()

    viewer = MapViewer("C:/folder/shapefile.shp")
    viewer.show()

    app.exec_()

    QgsApplication.exitQgis()

#############################################################################

if __name__ == "__main__":
    main()

ERROR: Opening of authentication db FAILED
ERROR: Unable to establish authentication database connection
ERROR: Auth db could not be created and opened
QSqlDatabasePrivate::database: unable to open database: "unable to open database file Error opening database"
ERROR: Opening of authentication db FAILED

self.layout = QVBoxLayout(...
self.layer = ...

self.canvas = QgsMapCanvas(self)
layout.addWidget(self.canvas)

Произошла ошибка при выполнении кода Python:

Трассировка (последний вызов был последним): файл «C: Users Lee / .qgis2 / python / plugins openlayers_plugin openlayers_plugin.py», строка 48, в самом addLayer. plugin.addLayer (self) Файл «C: Users Lee / .qgis2 / python / plugins openlayers_plugin openlayers_plugin.py», строка 194, в слое addLayer = OpenlayersLayer (self.iface, self .__ordinRSGoogle, self.olLayerTypeRegistry) Файл «C: Users Lee / .qgis2 / python / plugins openlayers_plugin openlayers_layer.py», строка 64, в __init
self.page = OLWebPage () Файл «C: Users Lee / .qgis2 / python / plugins openlayers_plugin openlayers_layer.py «, строка 38, в init
proxy = getProxy () Файл «C: Users Lee / .qgis2 / python / plugins openlayers_plugin tools_network.py», строка 42, в getProxy proxy.setPort (settings.value («/ proxyPort», 10, type = int)) TypeError: невозможно преобразовать QVariant типа 10 в QMetaType типа 2

Версия Python: 2.7.5 (по умолчанию, 15 мая 2013 г., 22:44:16) [MSC v.1500 64 бит (AMD64)]

Версия QGIS: 2.0.1-Dufour Dufour, d94c044

Путь к Python: [‘C: / PROGRA ~ 1 / QGISDU ~ 1 / apps / qgis /./ python / plugins processing’, ‘C: Users Lee .qgis2 python plugins GeoCoding’, ‘C: /PROGRA~1/QGISDU~1/apps/qgis/./python ‘,’ C: Users Lee / .qgis2 / python ‘,’ C: Users Lee / .qgis2 / python / plugins ‘,’ C : / PROGRA ~ 1 / QGISDU ~ 1 / apps / qgis /./ python / plugins ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 bin python27.zip ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps Python27 DLLs ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib plat-win ‘ , ‘C: PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib lib-tk’, ‘C: PROGRA ~ 1 QGISDU ~ 1 bin’, ‘C: PROGRA ~ 1 QGISDU ~ 1 apps Python27 ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib site-packages ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib site-packages PIL ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib site-packages win32 ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib site-packages win32 lib ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib site-packages Pythonwin ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib site-packages Shapely-1.2. 18-py2.7-win-amd64.egg ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib site-packages six-1.3.0-py2.7.egg ‘,’ C : PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib site-packages wx-2.8-msw-unicode ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib site-packages xlrd-0.9.2-py2.7.egg ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib site-packages xlwt-0.7.5-py2.7.egg ‘,’ C: Users Lee .qgis2 python plugins mmqgis / forms ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps qgis python plugins fTools tools ‘] PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib site-packages win32 lib ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib site-packages Pythonwin ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib site-packages Shapely-1.2.18-py2.7-win-amd64.egg ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib site-packages six-1.3.0-py2.7.egg ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib site-packages wx-2.8-msw -unicode ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib site-packages xlrd-0.9.2-py2.7.egg ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib site-packages xlwt-0.7.5-py2.7.egg ‘,’ C: Users Lee .qgis2 python plugins mmqgis / forms ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 приложения QGIS питон Plugins fTools инструменты] PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib site-packages win32 lib ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib site-packages Pythonwin ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib site-packages Shapely-1.2.18-py2.7-win-amd64.egg ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib site-packages six-1.3.0-py2.7.egg ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib site-packages wx-2.8-msw -unicode ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib site-packages xlrd-0.9.2-py2.7.egg ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib site-packages xlwt-0.7.5-py2.7.egg ‘,’ C: Users Lee .qgis2 python plugins mmqgis / forms ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 приложения QGIS питон Plugins fTools инструменты]2.18-py2.7-win-amd64.egg ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib site-packages six-1.3.0-py2.7.egg ‘,’ C : PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib site-packages wx-2.8-msw-unicode ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib site-packages xlrd-0.9.2-py2.7.egg ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib site-packages xlwt-0.7.5-py2.7.egg ‘,’ C: Users Lee .qgis2 python plugins mmqgis / forms ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps qgis python plugins fTools tools ‘]2.18-py2.7-win-amd64.egg ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib site-packages six-1.3.0-py2.7.egg ‘,’ C : PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib site-packages wx-2.8-msw-unicode ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib site-packages xlrd-0.9.2-py2.7.egg ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps Python27 lib site-packages xlwt-0.7.5-py2.7.egg ‘,’ C: Users Lee .qgis2 python plugins mmqgis / forms ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps qgis python plugins fTools tools ‘]egg ‘,’ C: Users Lee .qgis2 python plugins mmqgis / forms ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps qgis python plugins fTools tools ‘]egg ‘,’ C: Users Lee .qgis2 python plugins mmqgis / forms ‘,’ C: PROGRA ~ 1 QGISDU ~ 1 apps qgis python plugins fTools tools ‘]