我很想从单击PyQt中的按钮时调用的函数返回值.这就是我想为变量添加值的方式：

file_path = self.Button_open.clicked.connect(self.OpenTextFile)

整个功能如下：

def OpenTextFile(self):
    dialog = QtGui.QFileDialog()
    dialog.setWindowTitle("Choose a file to open")
    dialog.setFileMode(QtGui.QFileDialog.ExistingFile)
    dialog.setNameFilter("Text (*.txt);; All files (*.*)")
    dialog.setViewMode(QtGui.QFileDialog.Detail)

    filename = QtCore.QStringList()

    if(dialog.exec_()):
        file_name = dialog.selectedFiles()
    plain_text = open(file_name[0]).read()
    self.Editor.setPlainText(plain_text)
    return str(file_name[0])

现在,当我想将file_path传递给另一个函数时,python解释器说

self.Button_save.clicked.connect(self.SaveTextFile(file_path))
TypeError: connect() slot argument should be a callable or a signal, not ‘NoneType’

有什么想法使它起作用吗？

解决方法:

将file_path存储在类级别的变量中,然后在您的按钮click方法中更新该值.

self.file_path = None
self.Button_open.clicked.connect(self.OpenTextFile)

接着,

def OpenTextFile(self):
    dialog = QtGui.QFileDialog()
    dialog.setWindowTitle("Choose a file to open")
    dialog.setFileMode(QtGui.QFileDialog.ExistingFile)
    dialog.setNameFilter("Text (*.txt);; All files (*.*)")
    dialog.setViewMode(QtGui.QFileDialog.Detail)

    filename = QtCore.QStringList()

    if(dialog.exec_()):
        file_name = dialog.selectedFiles()
    plain_text = open(file_name[0]).read()
    self.Editor.setPlainText(plain_text)
    self.file_path = str(file_name[0])

还有你的

self.Button_save.clicked.connect(self.SaveTextFile(file_path))

应该

self.Button_save.clicked.connect(self.SaveTextFile)

然后在您的保存点击方法中

def SaveTextFile(self):
    save(self.file_path)     # Your code to save file