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[英]how to get the row number of an item in the qlistwidget using Pyqt5 in python
[英]how to return the value of item in the QlistWidget in PyQt5
我在 PyQt5 中有一个 GUI 应用程序,它在 QlistWidget 中创建带有复选框的显示项目,其中用户检查项目并且系统打印检查的值。
问题是当用户检查项目时,它会显示以下错误:
print([i.text() for i in self.checked])
AttributeError: 'str' object has no attribute 'text'
但是这一行print([i.text() for i in self.checked])
仅在打印中打印值
这一行是错误:
self.checked = [i.text() for i in self.checked]
代码:
from PyQt5 import QtCore, QtGui, QtWidgets
import os
import pandas as pd
import numpy as np
import chardet
class Ui_MainWindow(QtWidgets.QMainWindow):
def setupUi(self, MainWindow):
self.checked = []
MainWindow.setObjectName("MainWindow")
MainWindow.resize(800, 600)
self.centralwidget = QtWidgets.QWidget(MainWindow)
self.centralwidget.setObjectName("centralwidget")
self.header_list = QtWidgets.QListWidget(self.centralwidget)
self.header_list.setMaximumSize(QtCore.QSize(120, 1667))
self.header_list.setSelectionMode(QtWidgets.QAbstractItemView.MultiSelection)
self.header_list.setObjectName("header_list")
self.header_list.itemChanged.connect(self.selectionChanged)
MainWindow.setCentralWidget(self.centralwidget)
self.menubar = QtWidgets.QMenuBar(MainWindow)
self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 22))
self.menubar.setObjectName("menubar")
self.menufile = self.menubar.addMenu("File")
self.menufile.setObjectName("menufile")
self.menuimportfile = QtWidgets.QAction("Import File",self.menufile)
self.menuimportfile.setObjectName("importfile")
self.menuimportfile.triggered.connect(lambda:self.loadFile())
MainWindow.setMenuBar(self.menubar)
self.statusbar = QtWidgets.QStatusBar(MainWindow)
self.statusbar.setObjectName("statusbar")
MainWindow.setStatusBar(self.statusbar)
self.menufile.addAction(self.menuimportfile)
self.retranslateUi(MainWindow)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
def retranslateUi(self, MainWindow):
_translate = QtCore.QCoreApplication.translate
MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
self.menufile.setTitle(_translate("MainWindow", "file"))
def loadFile(self):
try:
fileName, _ = QtWidgets.QFileDialog.getOpenFileName(self, "Open File", "", "Excel Files (*.csv *.xls *.xlsx)");
print(fileName)
name, ext = os.path.splitext(fileName)
print("name: {} ".format(name))
print("ext: {} ".format(ext))
if ext == ".csv":
with open(fileName, 'rb') as rawdata:
result = chardet.detect(rawdata.read(100000))
print(result)
df = pd.read_csv(fileName,encoding = result["encoding"])
elif ext == ".xls" or ext == ".xlsx":
df = pd.read_excel(fileName)
self.df = df
#part that display items in the qlistWidget
self.header_list.clear()
savelist = list(self.df)
for item in savelist:
qitem = QtWidgets.QListWidgetItem ( )
qitem.setText ( item )
qitem. setFlags ( QtCore. Qt . ItemIsUserCheckable | QtCore. Qt . ItemIsEnabled )
qitem.setCheckState ( QtCore.Qt.Unchecked )
self.header_list.addItem ( qitem )
except Exception as e:
print("error is {}".format(e))
def selectionChanged(self, item):
if item.checkState():
if item not in self.checked:
self.checked.append(item)
elif item in self.checked:
self.checked.remove(item)
print([i.text() for i in self.checked])
self.checked = [i.text() for i in self.checked]
print(self.checked)
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
MainWindow = QtWidgets.QMainWindow()
ui = Ui_MainWindow()
ui.setupUi(MainWindow)
MainWindow.show()
sys.exit(app.exec_())
问题很简单,假设在变量“checked”中要保存已检查的 QListWidgetItem。 让我们通过一个例子来分析发生了什么:假设用户选择了第一个选项,然后“checked”最初将为空,因此选中的项目被比较并添加到列表中,但后来检查的是 QListWidgetItem 的文本列表,这使逻辑变性。 因此,作为一个教训,不要对多个事物使用相同的变量:
def selectionChanged(self, item):
if item.checkState():
if item not in self.checked:
self.checked.append(item)
elif item in self.checked:
self.checked.remove(item)
values = [i.text() for i in self.checked] print(values)
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