打开 Python 中的 XML 文件并添加用户输入

Question

我正在使用 python 2.7 创建一个程序，使用 Tkinter 作为 GUI 和 elementtree，其中用户输入的数据存储在 XML 文件中。我设法使用 python 创建了 XML 文件，并将其保存到文件 'crimeFile.xml' 中，所有标签均为空。 GUI 还显示允许用户输入文本的字段和文本框。问题是当我尝试保存一个条目时，出现错误，并且数据没有保存到 XML 文件中。

from xml.etree import ElementTree
from xml.etree.ElementTree import Element
from xml.etree.ElementTree import SubElement
import xml.etree.ElementTree as ET
from Tkinter import *

class Application(Frame):

    def create_XML(self):
        crimeReport = Element('crime report')
        caseNo = SubElement(crimeReport, 'case number')

        victimDetails = SubElement(caseNo, 'victim details')
        victimFirstName = SubElement(victimDetails, 'victims first name')
        victimSecondName = SubElement(victimDetails, 'victim surname')
        victimAddress = SubElement(victimDetails, 'victim address')

        output_file = open('crimeFile.xml', 'w')
        output_file.write('<?xml version="1.0"?>')
        output_file.write(ElementTree.tostring(crimeReport))
        output_file.close()

    def save_XML(self):

        record = ET.SubElement(self.crimeReport, 'crime report')      
        caseNoNode = ET.SubElement(record, 'case number')
        caseNoNode.text = self.caseNo.get()
        victimFirstNameNode = ET.SubElement(record, 'first name')
        victimFirstNameNode.text = self.victimFirstName.get()
        victimSecondNameNode = ET.SubElement(record, 'surname')
        victimSecondNameNode.text = self.victimSecondName.get()
        victimAddressNode = ET.SubElement(record, 'address')
        victimAddressNode.text = self.victimAddress.get()

        self.tree.write('crimeReport.xml')
        self.clear_field()


    def create_Widgets(self):
        self.save = Button(self)
        self.save["text"] = "Save",
        self.save["command"] = self.save_XML
        self.save["bg"]   = "cyan"
        self.save.grid(row=0,column =2,sticky=W+E+N+S)

        self.crimeReportLabel = Label(self, text = 'Crime Report')
        self.crimeReportLabel.grid(row=1,column =1,sticky=W)

        self.caseNoLabel = Label(self,text="Case Number")
        self.caseNoLabel.grid(row=2,column =1,sticky=W)
        self.caseNo = Entry(self)
        self.caseNo.grid(row=2,column =2,sticky=W)

        self.victimDetailsLabel = Label(self,text="Victim Details")
        self.victimDetailsLabel.grid(row=3,column =1,sticky=W)

        self.victimFirstNameLabel = Label(self,text="First Name")
        self.victimFirstNameLabel.grid(row=4,column =1,sticky=W)
        self.victimFirstName = Entry(self)
        self.victimFirstName.grid(row=4,column =2,sticky=W)

        self.victimSecondNameLabel = Label(self,text="Surname")
        self.victimSecondNameLabel.grid(row=4,column =3,sticky=W)
        self.victimSecondName = Entry(self)
        self.victimSecondName.grid(row=4,column =4,sticky=W)

        self.victimAddressLabel = Label(self,text="Address")
        self.victimAddressLabel.grid(row=6,column =1,sticky=W)
        self.victimAddress = Entry(self)
        self.victimAddress.grid(row=6,column =2,sticky=W)

    def __init__(self, master = None):
        Frame.__init__(self, master)
        self.grid(column=5,row=25)
        self.create_Widgets()
        self.create_XML()


crimeReport = Tk()
app = Application(master = crimeReport)
app.mainloop()
crimeReport.destroy()

我得到的错误是：

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Python27\lib\lib-tk\Tkinter.py", line 1532, in __call__
    return self.func(*args)
  File "C:\Users\Laleh\workspace\AdvDB20-02\program1\program1.py", line 60,  in save_XML
    record = ET.SubElement(self.crimeReport, 'crime report')
AttributeError: Application instance has no attribute 'crimeReport'

该程序的目的是创建一个 XML 文件供用户多次输入使用。更新并存储此 XML 文件中的新条目（不覆盖以前的条目），以便稍后可以搜索它并生成报告。我是 python 的新手，不确定我哪里出错了？

Answer 1

您的应用程序实例没有任何名为 crimeReport

的属性

def save_XML(self):
    record = ET.SubElement(self.crimeReport, 'crime report')
                           ^

crimeReport 仅在您的 create_XML 方法中定义。您可以将 crimeReport 定义为 class 属性。

class Application(Frame):
    crimeReport = Element('crime report')

并在您的方法中使用 self.crimeReport

打开 Python 中的 XML 文件并添加用户输入

Open XML file in Python and add user input

python

xml

tkinter