主线程以外的线程中未给出自动堆栈跟踪

Question

我有一个相当大的程序，它从一个 excel 文件加载一些数据并填充一个表单，由于文件的大小，这可能需要很长时间，所以我一直将加载函数移到一个单独的线程上，唯一的问题是由于某种原因，在这个新线程中，每当发生错误时，我都没有在控制台中获得自动堆栈跟踪。它只是默默地失败了，这使得调试它真的很痛苦。

我在 Eclipse 中使用 pydev，我编写了以下测试用例以确保一切正常。

    from PyQt4 import QtCore

class OtherThread(QtCore.QThread):


    def __init__(self):
        super(OtherThread, self).__init__()

    def run(self):
        try:
            print(1/0)
        except Exception as e:
            print("exception caught in other thread: \n{0}".format(e))

class MainThread():

    def __init__(self):
        self.otherThread = OtherThread()

    def run(self):
        try:
            print(1/0)
        except Exception as e:
            print("exception caught in main thread: \n{0}".format(e))

        self.otherThread.run()

def main():
    mainThread = MainThread()

    mainThread.run()

if __name__ == '__main__':
    main()

当我运行它时，两个异常都被正确捕获，当我注释掉tread对象中的try块时，它也可以正常工作，我得到了我的堆栈跟踪。我真的不知道发生了什么。我可以做些什么来导致这种行为吗？

这是我正在开发的程序的代码。

    def run(self):
        print("excel thread running")

        workbook = xlrd.open_workbook(self.path)
        worksheet = workbook.sheet_by_name('PNA Form')
# 
        currentRow = 13 # start grabbing pna data
        numRowStart = currentRow
        newPartCol= 0
        oldPartCol = 10
        descriptionCol = 2
# 
        numberOfRows = worksheet.nrows - 1
#     
        print("number of rows = {0}".format(numberOfRows))
        PNA = []
#         
        current_color = False
        while (currentRow < numberOfRows):

            print("about to parse excel rows")
            newPartCell = int(worksheet.cell(currentRow,newPartCol).value)
            oldPartCell = int(worksheet.cell(currentRow,oldPartCol).value)
            descriptionCell =  QtCore.QString(worksheet.cell(currentRow,descriptionCol).value)

            print("excel rows parsed: {0}, {1}, {2}, {3}".format(oldPartCell,newPartCell,descriptionCell,current_color))

            print("running line excel row {0}: {1}".format(currentRow, str(descriptionCell)))
            if not self.isStrikethrough(currentRow,0): #make sure the line does not have strike through
                #self.guiHandel.BOMVal.addPNARow(oldPN = oldPartCell, newPN = newPartCell, disc = descriptionCell)
                print("about to emit pna row tracker for {0}".format(descriptionCell))
                self.addPNARowTracker.emit(oldPartCell,newPartCell,descriptionCell)
                print("thread still running after pna row tracker emit")

            if (oldPartCell != "" and not self.isStrikethrough(currentRow,0)):
                PNA.append((num(oldPartCell),num(newPartCell)))
                current_color = not current_color
                #self.guiHandel.pnaVerticalLayoutScroll.addWidget(PNACell(oldPartCell,newPartCell,descriptionCell,color = current_color))
                print("about to emit addPNARow: {0}, {1}, {2}, {3}".format(oldPartCell,newPartCell,descriptionCell,current_color))
                self.addPNARow.emit(oldPartCell,newPartCell,descriptionCell,current_color)
                #self.guiHandel.widgetStack.append(PNACell(oldPartCell,newPartCell,descriptionCell,color = current_color))
                print("thread still running after add pna row emit")

            currentRow += 1

            #self.guiHandel.pbar.setValue(int(100*(currentRow-13)/numberOfRows))
            print("currentRow =",currentRow)
            self.updateProgress.emit(int(100*(currentRow-numRowStart)/(numberOfRows-numRowStart)))

        print(PNA)
        self.done.emit()

这是失败时的控制台输出。

slot add pna row tracker called
running is about to return
about to emit addPNARow: 28458820, 28489881, INST CSTR-ASM,DIESEL,KM,UP,GAT, False
thread still running after add pna row emit
('currentRow =', 29slot add pna row called)

about to parse excel rows
Added addPNARow: 28458820, 28489881, INST CSTR-ASM,DIESEL,KM,UP,GAT, False
excel progress update called ------- progress = 20

当通过调试器运行时，它会停在这一行：

newPartCell = int(worksheet.cell(currentRow,newPartCol).value)

我尝试将它包装在一个 try 块中，但它从未遇到异常。它试图读取的单元格是空白的。

这里发生了什么？任何想法将不胜感激。

Answer 1

在此处找到问题的答案：error in pyqt qthread not printed

基本上你需要手动封装QThread对象的整个run方法，然后手动rethrow errors到stderr