Question

我查看了创建QTableWidgetItems的文档，并说它需要使用item()方法。＆＃34;返回给定行和列的项（如果已设置）;否则返回0。＆＃34; 以下是我如何使用它：

self.table.item(item.row(),1)

这些值肯定有一个项目。 item.row()是与我尝试返回的同一行中的项关联的行。关于该项目的一切工作正常，.text()返回正确的信息。我用这个项目得到了 self.table.itemChanged.connect(self.log_change)

由于某种原因，我试图返回的这个项目并不起作用。当我去print(self.table.item(item.row(),1).text()) 它什么都不打印，只是一个空字符串。它应该打印的值是int(0)

围绕着int()并不起作用。

我是否可以通过某种方式选择或返回该行和列中的项目，并.text()为其提供int(0)作为结果？当QTableWidget显示数字0时，为什么只是打印一个空字符串？

编辑：

    self.cur.execute("""SELECT s.StudentID, s.FullName, m.PreviouslyMailed, m.nextMail, m.learnersDate, m.RestrictedDate, m.DefensiveDate FROM
                        StudentProfile s LEFT JOIN Mailouts m ON s.studentID=m.studentID""")
    self.all_data = self.cur.fetchall()
    self.search_results()

    self.table.setRowCount(len(self.all_data))
    self.tableFields = ["Check","REMOVE THIS","Full name","Previously mailed?","Next mail","learners date","Restricted date","Defensive driving date"]
    self.columnList = ["StudentID","FullName","PreviouslyMailed","NextMail","learnersDate","RestrictedDate","DefensiveDate"]
    self.table.setColumnCount(len(self.tableFields))
    self.table.setHorizontalHeaderLabels(self.tableFields)
    self.checkbox_list = []
    for i, item in enumerate(self.all_data):
        FullName = QtGui.QTableWidgetItem(str(item[1]))
        PreviouslyMailed = QtGui.QComboBox()
        PreviouslyMailed_combobox_list = ["No", "Yes"]
        PreviouslyMailed.addItems(PreviouslyMailed_combobox_list)
        LearnersDate = QtGui.QTableWidgetItem(str(item[4]))
        RestrictedDate = QtGui.QTableWidgetItem(str(item[5]))
        DefensiveDate = QtGui.QTableWidgetItem(str(item[6]))
        NextMail = QtGui.QTableWidgetItem(str(item[3]))
        StudentID = QtGui.QTableWidgetItem(item[0])
        self.table.setItem(i, 1, StudentID)
        self.table.setItem(i, 2, FullName)
        self.table.setCellWidget(i, 3, PreviouslyMailed)
        self.table.setItem(i, 4, LearnersDate)
        self.table.setItem(i, 5, RestrictedDate)
        self.table.setItem(i, 6, DefensiveDate)
        self.table.setItem(i, 7, NextMail)
        chkBoxItem = QtGui.QTableWidgetItem()
        chkBoxItem.setFlags(QtCore.Qt.ItemIsUserCheckable | QtCore.Qt.ItemIsEnabled)
        chkBoxItem.setCheckState(QtCore.Qt.Unchecked)
        self.checkbox_list.append(chkBoxItem)
        self.table.setItem(i, 0, self.checkbox_list[i])
        FullName.setFlags(FullName.flags() & ~Qt.ItemIsEditable)
        NextMail.setFlags(NextMail.flags() & ~Qt.ItemIsEditable)
    self.table.blockSignals(False)
    self.changed_items = []
    self.table.itemChanged.connect(self.log_change)

def log_change(self, item):
    self.table.blockSignals(False)
    self.changed_items.append((self.table.itemAt(item.row(),1),item))

def click_btn_edit(self):
    print("Updating")
    IDList = []
    for item in self.changed_items:
        text, col, row = item[1].text(), item[1].column(), item[1].row()
        new_data = self.all_data
        IDvar = item[0].text()
        #IDvar prints as an empty string.
        IDList.append(IDvar)

第二次编辑：

import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from PyQt4 import *
import sqlite3
from datetime import datetime
import calendar
import sip
sip.setapi('QVariant', 2)


class WindowContainer():
    def __init__(self):
        self.windows = []


def _fromUtf8(t):
    return t

class mainWindowTemplate(QMainWindow):

    def __init__(self):

        super().__init__()
        self.initUI()

    def initUI(self):
        self.setObjectName(_fromUtf8("mainWindowTemplate"))
        self.resize(800, 600)
        self.centralwidget = QtGui.QWidget(self)
        self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
        self.gridLayout = QtGui.QGridLayout(self.centralwidget)
        self.gridLayout.setObjectName(_fromUtf8("gridLayout"))

        self.table = QtGui.QTableWidget(self.centralwidget)
        self.table.setObjectName(_fromUtf8("table"))
        self.table.setColumnCount(0)
        self.table.setRowCount(0)
        self.gridLayout.addWidget(self.table, 0, 0, 1, 1)

        self.btn_edit = QtGui.QPushButton(self.centralwidget)
        self.btn_edit.setObjectName(_fromUtf8("btn_edit"))
        self.gridLayout.addWidget(self.btn_edit, 1, 0, 1, 1)
        self.setCentralWidget(self.centralwidget)
        self.btn_edit.clicked.connect(self.click_btn_edit)

        self.menubar = QtGui.QMenuBar(self)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 21))
        self.menubar.setObjectName(_fromUtf8("menubar"))
        self.setMenuBar(self.menubar)

        """self.statusbar = QtGui.QStatusBar(self)
        self.statusbar.setObjectName(_fromUtf8("statusbar"))
        self.setStatusBar(self.statusbar)"""

        self.setWindowTitle("MainWindow")
        self.btn_edit.setText("Edit")

        self.conn = sqlite3.connect("EDA_Database.db")
        self.cur = self.conn.cursor()

        QtCore.QMetaObject.connectSlotsByName(self)
        self.show()
        self.click_btn_mailingInfo()


    def retranslateUi(self):

        self.setWindowTitle(_translate("MainWindow", "MainWindow", None))

    def click_btn_mailingInfo(self):
        self.table.blockSignals(True)
        self.screen_name = "mailingInfo"
        self.cur.execute("""SELECT s.StudentID, s.FullName,     m.PreviouslyMailed, m.nextMail, m.learnersDate, m.RestrictedDate, m.DefensiveDate FROM
                        StudentProfile s LEFT JOIN Mailouts m ON s.studentID=m.studentID""")
        self.all_data = self.cur.fetchall()

        self.table.setRowCount(len(self.all_data))
        self.tableFields = ["Check","If you see this column, an error has occured.","Full name","Previously mailed?","Next mail","learners date","Restricted date","Defensive driving date"]
        self.columnList = ["StudentID","FullName","PreviouslyMailed","NextMail","learnersDate","RestrictedDate","DefensiveDate"]
        self.table.setColumnCount(len(self.tableFields))
        self.table.setHorizontalHeaderLabels(self.tableFields)
        self.checkbox_list = []
        for i, item in enumerate(self.all_data):
            FullName = QtGui.QTableWidgetItem(str(item[1]))
            PreviouslyMailed = QtGui.QComboBox()
            PreviouslyMailed_combobox_list = ["No", "Yes"]
            PreviouslyMailed.addItems(PreviouslyMailed_combobox_list)
            LearnersDate = QtGui.QTableWidgetItem(str(item[4]))
            RestrictedDate = QtGui.QTableWidgetItem(str(item[5]))
            DefensiveDate = QtGui.QTableWidgetItem(str(item[6]))
            NextMail = QtGui.QTableWidgetItem(str(item[3]))
            StudentID = QtGui.QTableWidgetItem(str(item[0]))
            self.table.setItem(i, 1, StudentID)
            self.table.setItem(i, 2, FullName)
            self.table.setCellWidget(i, 3, PreviouslyMailed)
            self.table.setItem(i, 4, LearnersDate)
            self.table.setItem(i, 5, RestrictedDate)
            self.table.setItem(i, 6, DefensiveDate)
            self.table.setItem(i, 7, NextMail)
            chkBoxItem = QtGui.QTableWidgetItem()
            chkBoxItem.setFlags(QtCore.Qt.ItemIsUserCheckable | QtCore.Qt.ItemIsEnabled)
            chkBoxItem.setCheckState(QtCore.Qt.Unchecked)
            self.checkbox_list.append(chkBoxItem)
            self.table.setItem(i, 0, self.checkbox_list[i])
            FullName.setFlags(FullName.flags() & ~Qt.ItemIsEditable)
            NextMail.setFlags(NextMail.flags() & ~Qt.ItemIsEditable)
        self.table.setColumnHidden(1, True)
        self.table.blockSignals(False)
        self.changed_items = []
        self.combobox_item_list = []
        self.table.itemChanged.connect(self.log_change)
        #PreviouslyMailed.currentIndexChanged.connect(self.comboBox_change(None,None,row,1,self.table.cellWidget(row,1).currentText()))

    def log_change(self, item):
        self.table.blockSignals(False)
        self.changed_items.append((self.table.item(item.row(),1),item))

    def click_btn_edit(self):
        IDList = []
        for item in self.changed_items:
            text, col, row = item[1].text(), item[1].column(), item[1].row()
            new_data = self.all_data
            IDvar = item[0].text()

            #no longer works
            print(text)

            #now works
            print(IDvar)

            IDList.append(IDvar)

if __name__ == "__main__":
    container = WindowContainer()
    app = QApplication(sys.argv)
    container.windows.append(mainWindowTemplate())
    sys.exit(app.exec_())

Answer 1

如果查看QTableWidgetItem的qt文档，您将看到它只能从另一个项目，字符串，图标和字符串或表示项目类型ID的整数构造。您正在为构造函数直接提供学生ID，因此它正在使用最后一个构造函数，该构造函数创建一个空项。所以，使用这个：

StudentID = QtGui.QTableWidgetItem(str(item[0]))

修复后，您仍然遇到连接到click_btn_mailingInfo中的表itemChanged信号的问题。验证此函数仅被调用一次（特别是禁用行，以便我们按名称连接s以查看它是否有所不同）。

为什么我无法正确检索和使用QTableWidgetItem？

1 个答案: