AttributeError：物件在for回圈中沒有屬性

在我的FIFO演算法模擬中，我目前正在嘗試為七個模擬任務中的每一個創建一個物件，稍后將用于在 Excel 中以圖形方式顯示一些時間引數。所以我在一個for回圈中創建所有物件，在另一個回圈中，我用這些物件中的每一個執行相應的函式，以便在另一個類中傳輸到 Excel。

但在第二個for回圈中，我總是收到錯誤訊息

File "G:\Schedulibg\PyScheduler\pyFIFOAlgorithm.py", line 48, in sched_StartScheduler
    self.worksheet1.write('A'   str((self.tasksAdded * 4)   1), 'Turn Around Time:')
AttributeError: 'pyFIFOAlgorithm' object has no attribute 'worksheet1' "

我不知道為什么它在pyFIFOAlgorithm中尋找worksheet1，雖然物件來自pyToExcel，對應的方法來自于類。我已經更改了 的名稱taskTest，因為我讀到這也可能是一個問題。在它被稱為 tsk 之前。

import pyScheduler
from pyToExcel import pyToExcel


def alg_SortArrivedTasks(arrivedTasks):
    sortedTasks = []
    for taskx in arrivedTasks:
        sortedTasks.append(taskx)
    sortedTasks.sort(key=lambda x: x.tskArrival)
    return sortedTasks


class pyFIFOAlgorithm(pyScheduler.pyScheduler):
    def __init__(self, taskSet, sched_Alg, idleTime):
        self.alg_Identifier = 2
        self.alg_Name = 'FIFO'
        self.completionTime = 0
        self.turnAroundTime = 0
        self.totalWaitingTime = 0
        self.totalTurnAroundTime = 0
        self.tasksAdded = 0
        super(pyFIFOAlgorithm, self).__init__(taskSet, sched_Alg, idleTime)


    def sched_StartScheduler(self, taskSet):
        self.sched_SchedulingPoints.insert(0, self.sched_Clock)
        taskList = []
        taskNumber = 1
        for task in alg_SortArrivedTasks(taskSet):
            print("\nArrival time of ", task.tskName, ": ", task.tskArrival)
            self.sched_ExecuteAvailableTasks(task)
            self.completionTime = task.completiontime
            self.turnAroundTime = ((self.completionTime) - task.tskArrival)
            #taskList.append(pyToExcel(taskNumber, self.completionTime, self.turnAroundTime))
            self.totalTurnAroundTime  = self.turnAroundTime
            print("Turn Around Time: ""{:.2f}".format(self.turnAroundTime))
            print("Completion Time: ""{:.2f}".format(self.completionTime))
            taskList.append(pyToExcel(task.tskName, self.completionTime, self.turnAroundTime))

        for taskTest in taskList:
            pyToExcel.inputData(pyToExcel, taskNumber, taskTest.turn, taskTest.completion) #Line with Error
            taskNumber  = 1


        print("\nAll tasks executed at: ", "{:.2f}".format(self.sched_Clock))
        print("Average Waiting Time: ", "{:.2f}".format((self.totalWaitingTime /len(taskSet))))
        print("Average Turn Around Time: ", "{:.2f}".format((self.totalTurnAroundTime / len(taskSet))))
        self.worksheet1.write('A'   str((self.tasksAdded * 4)   1), 'Turn Around Time:')
        self.worksheet1.write('B'   str((self.tasksAdded * 4)   1), self.totalTurnAroundTime / len(taskSet))
        self.workbook.close()

import xlsxwriter

class pyToExcel:
    def __init__(self, task, completion, turn):
        self.task = task
        self.completion = completion
        self.turn = turn

    workbook = xlsxwriter.Workbook('AlgorithmData.xlsx')
    worksheet1 = workbook.add_worksheet('FIFO')
    worksheet2 = workbook.add_worksheet('Graphics')
    cell_format = workbook.add_format(
        {
            "border": 1,
            "border_color": "#000000"
        }
    )
    cell_format.set_font_color('green')
    cell_format.set_bold()
    cell_format.set_align('center')
    cell_format.set_align('vcenter')
    worksheet1.set_column(0, 0, 17)
    worksheet1.set_column(1, 1, 12)
    worksheet2.write('A'   str(1), 'Task', cell_format)
    worksheet2.write('B'   str(1), 'Completion Time', cell_format)
    worksheet2.write('C'   str(1), 'Turn Around Time', cell_format)
    worksheet2.write('D'   str(1), 'Waiting Time', cell_format)
    worksheet2.set_column(0, 0, 4)
    worksheet2.set_column(1, 1, 15)
    worksheet2.set_column(2, 2, 17)
    worksheet2.set_column(3, 3, 12)

    def inputData(self, task,  turnaround, completion):

        pyToExcel.worksheet1.write('A'   str((task * 4)   1), 'Turn Around Time:')
        pyToExcel.worksheet1.write('B'   str((task * 4)   1), turnaround)
        pyToExcel.worksheet1.write('A'   str((task * 4)   2), 'Completion Time:')
        pyToExcel.worksheet1.write('B'   str((task * 4)   2), completion)
        pyToExcel.worksheet2.write('A'   str((task   1)), task)
        pyToExcel.worksheet2.write('B'   str((task   1)), completion)
        pyToExcel.worksheet2.write('C'   str((task   1)), turnaround)
        pyToExcel.worksheet2.write('D'   str((task   1)), 'waiting time')

uj5u.com熱心網友回復：

它正在查找worksheet1屬性，因為您告訴它：

self.worksheet1.write('A'   str((self.tasksAdded * 4)   1), 'Turn Around Time:')
     ^^^^^^^^^^

根據您參考的文本，該行也在錯誤訊息中參考，是程式的第48行。您標記為錯誤位置的行是第38行，但回溯肯定是第48行。

該方法是 的類定義的一部分pyFIFOAlgorithm，因此self幾乎可以肯定是一個pyFIFOAlgorithm物件。也許self是一個錯字。

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