使用 QTextEdit.find() 时出现 Python pyqt 错误 : unexpected type 'builtin_function_or_method'

Question

尝试使用 QTextEdit 小部件的内置“查找”功能，但当我尝试从 QLineEdit 小部件传递文本时，出现以下错误:

Traceback (most recent call last):
  File "C:\SVN\Gocator\Trunk\Gocator\GoPy\Scripts\testfind.pyw", line 52, in on_find_button_clicked
    self.fileEdit.find(self.findLine.text)
TypeError: QTextEdit.find(str, QTextDocument.FindFlags options=0): argument 1 has unexpected type 'builtin_function_or_method'

我已经查看了 QTextEdit 类的文档，内容不多，但我不明白为什么它会给我这个错误。有趣的是，如果我在 find() 调用中将 QLineEdit 文本属性的引用替换为字符串文字(例如“What”)(第 52 行:self.fileEdit.find(self.findLine.text))，它会起作用。

我的测试代码非常简单，所以我认为这只是我在我眼前看不到的东西。有人看到我哪里出错了或者甚至遇到了同样的问题吗？这是我的测试脚本(我只安装了 Qt4):

#!/usr/bin/env python

# Needs Qt5 (recommended) or Qt4

# PyQt5: run pip3 install pyqt5
# PyQt4: from http://www.riverbankcomputing.com/software/pyqt/download

import shelve
import sys

sys.path.append('../GoPy')
sys.path.append('../../GoPy')

from PyQt4.QtCore import *
from PyQt4.QtGui import *

class ControlEngine:
    def __init__(self):

        self.shelf = shelve.open("ui_control.shelf")

class MainWindow(QWidget):
    def __init__(self):
        QWidget.__init__(self)

        self.engine = ControlEngine()
        self.create_ui()

    def create_ui(self):
        mainLayout = QVBoxLayout()

        # View group

        viewGroup = QGroupBox("File View")
        viewLayout = QVBoxLayout()
        self.fileEdit = QTextEdit("Today at Safeway, here's what we have for you.")
        self.fileEdit.setFont(QFont("Courier New", 10))
        viewLayout.addWidget(self.fileEdit)

        self.findButton = QPushButton("Find Next Word")
        self.findButton.clicked.connect(self.on_find_button_clicked)
        self.findLine = QLineEdit("What")
        viewLayout.addWidget(self.findLine)
        viewLayout.addWidget(self.findButton)

        viewGroup.setLayout(viewLayout)
        mainLayout.addWidget(viewGroup)

        self.setLayout(mainLayout)
        self.fileEdit.moveCursor(1)

    @pyqtSlot(int, int)

    def on_find_button_clicked(self):
        self.fileEdit.find(self.findLine.text)

class App(QApplication):
    def __init__(self, argv):
        QApplication.__init__(self, argv)

    def start(self):
        mainWindow = MainWindow()
        self.mainWindow = mainWindow
        mainWindow.resize(300, 300)
        mainWindow.setWindowTitle("Test Find")
        mainWindow.show()

        return self.exec_()

def main():
    app = App(sys.argv)    
    sys.exit(app.start())


if __name__ == '__main__':
    main()

Answer 1

改变这个

    self.fileEdit.find(self.findLine.text)

至

    self.fileEdit.find(self.findLine.text())

因为它是函数而不是属性:)