pyqt5插槽参数在第一次致电后未更新

Question

我有一个信号，该信号连接到我用来更改matplotlib图上X范围跨度的插槽。当用户更改显示所有跨度的表中的启动X值时，我正在尝试更新跨度。但是，在第一个跨度编辑之后，程序编辑所有内容都好像它们正在编辑相同的跨度，而不是新选择的跨度。运行代码时：

@QtCore.pyqtSlot()
    def xStartChanged(xStart, rowVal):
        if self.inCounter == 0:
            print( "row in start changed: ", rowVal)
            print("xStart in start changed: ", xStart)
            print(type(xStart))
            tagName = self.highlights[xStart].tag
            xEnd = self.highlights[xStart].xEnd
            xStartNew = int(self.taggingTable.item(rowVal, 1).text())
            self.highlights[xStart].highlightObj.remove() #remove old from the plot
            del self.highlights[xStart]                   #remove old from directory
            highlightObj = self.Axes.axvspan(xStartNew, xEnd, color = 'blue', alpha = 0.5) #add new to plot
            
            self.highlights[xStartNew] = highlight(tagName, xStartNew, xEnd, highlightObj) #add new to directory
            self.taggingTable.clearSelection() #deselect value from table
            self.draw_idle()#update plot
        self.inCounter = self.inCounter + 1

     def onCellSelect():
            index = self.taggingTable.selectedIndexes()
            if len(index) != 0:
                rowVal = index[0].row()
                #get the starting adn ending indices so they can be edited. 
                ##deal with empty cell click
                if not (self.taggingTable.item(rowVal, 1) is None):
                    xStart = int(self.taggingTable.item(rowVal, 1).text())
                    print("row in cell select: ", rowVal)
                    print("xStart in cell select: ", xStart)
                    xEnd = int(self.taggingTable.item(rowVal, 2).text())
                    self.inCounter = 0
                    #self.taggingTable.itemChanged.connect(lambda state, item = None, xStartVal = xStart, rowValFxn = rowVal: xStartChanged(xStartVal, rowValFxn))
                    print(type(xStart))
                    self.taggingTable.itemChanged.connect(lambda item = None, xStart = xStart: xStartChanged(xStart, rowVal))
                    self.draw_idle()
                    #self.taggingTable.itemChanged.connect(xEndChanged)
                
    #self.taggingTable.cellDoubleClicked.connect(onCellSelect)
    self.taggingTable.selectionModel().selectionChanged.connect(onCellSelect)
    self.draw_idle()

我将获得以下输出：（注意：我隐藏了“路径”，因为它与工作有关，对不起

row in cell select:  0
xStart in cell select:  3517
<class 'int'>
row in start changed:  0
xStart in start changed:  3517
<class 'int'>
row in cell select:  1
xStart in cell select:  2801
<class 'int'>
row in start changed:  0
xStart in start changed:  3517
<class 'int'>
Traceback (most recent call last):
  File "path", line 314, in <lambda>
    self.taggingTable.itemChanged.connect(lambda item = None, xStart = xStart: xStartChanged(xStart, rowVal))
  File "path", line 277, in xStartChanged
    tagName = self.highlights[xStart].tag
KeyError: 3517
zsh: abort      path

。在更改和编辑单元格之后，第一个插槽函数（OnCellSelect）正在读取新的单元格值和XSTART值，但是嵌套的信号插槽连接（XstartChanged）仍将保留在较旧的单元格和XSTART值上。我假设我在某种程度上打电话给它，我没有意识到

编辑

    import sys
   
    from PyQt5.QtWidgets import *
    from PyQt5 import QtCore
    from PyQt5.QtCore import *
    from PyQt5.QtGui import *
    
    from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
    from matplotlib.figure import Figure
    import matplotlib.widgets as mwidgets
    
    class Window(QMainWindow):
    
        def __init__(self, parent = None):
            super(Window, self).__init__(parent)
            self.resize(1600, 800)
            self.MyUI()
            
        def MyUI(self):
    
            canvas = Canvas(self, width=14, height=12, dpi=100)
            canvas.move(0,0)
    
    class Canvas(FigureCanvas):
        def __init__(self, parent, width = 14, height = 12, dpi = 100):
            Plot = Figure(figsize=(width, height), dpi=dpi)
            self.Axes = Plot.add_subplot(111)
            self.Axes.set_position([0.05, 0.58, 0.66, 0.55])
            self.rowCount = 0
            super().__init__(Plot)
            self.setParent(parent)
    
            
            ##add all relevant lines to plot 
            self.Axes.plot([0,1,2,3,4], [3, 4, 5, 6, 7])
            self.Axes.set_xlabel('Frame', fontsize = 10) 
            self.Axes.grid()
            self.Axes.set_aspect(1)
            Plot.canvas.draw()
    
    
            #use this object in the dictionary to hold onto all the spans. 
            class highlight:
                def __init__(self, tag, xStart, xEnd, highlightObj):
                    self.tag = tag
                    self.xStart = xStart
                    self.xEnd = xEnd
                    self.highlightObj = highlightObj
    
            self.highlights = {} #empty dictionary to store all the tags.
    
            ##define a table to hold the values postselection
            self.taggingTable = QTableWidget(self)
            self.taggingTable.setColumnCount(3)
            self.taggingTable.setRowCount(100)
            self.taggingTable.setGeometry(QRect(1005,85, 330, 310))
            self.taggingTable.setHorizontalHeaderLabels(['Behavior','Start Frame', 'End Frame'])
    
            ##highlighting adds a highlight item to the directory. 
            def onHighlight(xStart, xEnd):
                tagName = "No Tag"
                self.taggingTable.setItem(self.rowCount, 0, QTableWidgetItem(tagName))
                self.taggingTable.setItem(self.rowCount, 1, QTableWidgetItem(str(int(xStart))))
                self.taggingTable.setItem(self.rowCount, 2, QTableWidgetItem(str(int(xEnd))))
                self.rowCount = self.rowCount + 1
                highlightObj = self.Axes.axvspan(xStart, xEnd, color = 'blue', alpha = 0.5)
                self.highlights[int(xStart)] = highlight(tagName, xStart, xEnd, highlightObj)
                self.draw_idle()
                    
            self.span = mwidgets.SpanSelector(self.Axes, onHighlight, "horizontal", 
                                            interactive = True, useblit=True, props=dict(alpha=0.5, facecolor="blue"),)
            self.draw_idle()
    
            ##TODO: editing spans in table is reflected in plot --- use axvspan to track spans? and spanselector to draw them?
            ##define workflow for when a cell is selected
            def xStartChanged(xStart, rowVal):
                if self.inCounter == 0:
                    print( "row in start changed: ", rowVal)
                    print("xStart in start changed: ", xStart)
                    xEnd = self.highlights[xStart].xEnd
                    xStartNew = int(self.taggingTable.item(rowVal, 1).text())
                    self.highlights[xStart].highlightObj.remove() #remove old from the plot
                    del self.highlights[xStart]                   #remove old from directory
                    highlightObj = self.Axes.axvspan(xStartNew, xEnd, color = 'blue', alpha = 0.5) #add new to plot
                    self.highlights[xStartNew] = highlight("No tagName", xStartNew, xEnd, highlightObj) #add new to directory
                    self.taggingTable.clearSelection() #deselect value from table
                    self.draw_idle()#update plot
                self.inCounter = self.inCounter + 1
    
            def onCellSelect():
                index = self.taggingTable.selectedIndexes()
                if len(index) != 0:
                    rowVal = index[0].row()
                    if not (self.taggingTable.item(rowVal, 1) is None):
                        xStart = int(self.taggingTable.item(rowVal, 1).text())
                        print("row in cell select: ", rowVal)
                        print("xStart in cell select: ", xStart)
                        self.inCounter = 0
                        self.taggingTable.itemChanged.connect(lambda: xStartChanged(xStart, rowVal))              
           
            self.taggingTable.selectionModel().selectionChanged.connect(onCellSelect)
            self.draw_idle()
    
    
    app = QApplication(sys.argv)
    window = Window()
    window.show()
    app.exec()

？

    row in cell select:  0
    xStart in cell select:  2
    row in start changed:  0
    xStart in start changed:  2
    row in cell select:  1
    xStart in cell select:  1
    row in start changed:  0
    xStart in start changed:  2
    Traceback (most recent call last):
      File "path", line 103, in <lambda>
        self.taggingTable.itemChanged.connect(lambda: xStartChanged(xStart, rowVal))              
      File "path", line 84, in xStartChanged
        xEnd = self.highlights[xStart].xEnd
    KeyError: 2
    zsh: abort      "path"