python - 使用 ElementTree 解析 xml 时，参数 1 出现意外类型错误

Question

我使用这段代码在QGIS中制作插件，我尝试从本地驱动器打开xml，读取它然后解析它并在QLine中显示特定信息，我使用这段代码:

from PyQt4 import QtCore, QtGui
from ui_testparse import Ui_testparse
import xml.etree.ElementTree as ETree
# create the dialog for zoom to point


class testparseDialog(QtGui.QDialog):
    def __init__(self):
        QtGui.QDialog.__init__(self)
        # Set up the user interface from Designer.
        self.ui = Ui_testparse()
        self.ui.setupUi(self)

        opendata = self.ui.btnCari
        QtCore.QObject.connect(opendata, QtCore.SIGNAL('clicked()'),self.openxml)

    def openxml(self, event=None):

        #open dialog
        openfile = QtGui.QFileDialog.getOpenFileName(self, 'Open File', '*.xml')

        self.ui.lineLokasi.setText(openfile)

        #call XML data
        self.isiData(openfile)

    def isiData(self, nmsatu):
        #open teks with read mode
        openteks = open(nmsatu, 'r').read()

        self.ui.textXml.setText(openteks)

        #Parse XML from Above
        self.parsenow(openteks)

    def parsenow(self, parse):
        element = ETree.fromstring(parse)
        xml_obj = ETree.ElementTree(element)
        for title_obj in xml_obj.findall('.//{http://www.isotc211.org/2005/gmd}dateStamp/'
             '{http://www.isotc211.org/2005/gco}Date'):
            print element
        self.ui.lineSkala.setText(element)

但是当我尝试运行它时，我收到一条错误消息

Traceback (most recent call last):
  File "C:\Users\Mr.Pakde/.qgis2/python/plugins\testparse\testparsedialog.py", line 47, in openxml
    self.isiData(openfile)
  File "C:\Users\Mr.Pakde/.qgis2/python/plugins\testparse\testparsedialog.py", line 56, in isiData
    self.parsenow(openteks)
  File "C:\Users\Mr.Pakde/.qgis2/python/plugins\testparse\testparsedialog.py", line 64, in parsenow
    self.ui.lineSkala.setText(element)
TypeError: QLineEdit.setText(QString): argument 1 has unexpected type 'Element'

Python version:
2.7.4 (default, Apr  6 2013, 19:54:46) [MSC v.1500 32 bit (Intel)]

有人可以帮我解决这个问题吗？

Answer 1

element 变量的类型为 Element，而 QLineEdit 中的 setText() 需要 QString 参数。当你:

print element

在调用 setText() 之前，它可能会打印 Element 类中的 0 __repr__ 方法返回的字符串