Python 脚本未将列表的最后一个元素记录到csv文件中

我有一个Python类（

TimeTesting

），里面有3个方法-

TimeTest1

-获取当前时间并引入1秒睡眠

TimeTest2

-获取当前时间，并计算在

TimeTest1

中获取的时间与在函数

TimeTest2

中获取的时间之间的差

LogOperation

将操作记录到csv文件中，文件头为

IterationNumber

、

T1Value

、

T2Value

和

时差

我在一个循环中运行所有三个函数10次。但是最后一次迭代（即第10次迭代）没有被捕获到日志文件中。 下面是我的代码

import datetime
from datetime import timedelta
import time
import csv
import collections

MyVar1 = range(1,11)
DataList = []

class TimeTesting:
    def TimeTest1(self):
        self.T1 = datetime.datetime.now()
        time.sleep(1)
        self.LogFileHeader = ['IterationNumber', 'T1Value', 'T2Value', 'TimeDifference']
        print('TimeTest1 function called')

    def TimeTest2(self):
        self.T2 = datetime.datetime.now()
        self.TimeDiff = self.T2 - self.T1
        print('Timetest2 function called')

    #Log operation function
    def LogOperation(self, Var1):        
        with open('LogFile.csv', 'w') as LogList:
            write = csv.writer(LogList, delimiter = "|", lineterminator = "\n") 
        
            #Extracting the header from the log file
            with open('LogFile.csv', 'r') as ReadLogFile:
                reader = csv.DictReader(ReadLogFile)
                fieldnames = reader.fieldnames
                FileHeaderStringFormat = str(fieldnames)

            #Converting the header from the TimeTest1 function
            TempResult1 = str(self.LogFileHeader)
            LogHeaderStringFormat = TempResult1.replace("', '", "|")

            #Comparing FileHeaderStringFormat and LogHeaderStringFormat
            a = set(FileHeaderStringFormat)
            b = set(LogHeaderStringFormat)  
  
            if collections.Counter(a) == collections.Counter(b):
                write.writerows(DataList)
                DataList.append((Var1, self.T1, self.T2, self.TimeDiff))
            else:
                write.writerow(self.LogFileHeader)
                write.writerows(DataList)
                DataList.append((Var1, self.T1, self.T2, self.TimeDiff))


ob = TimeTesting()

for item in MyVar1:
    ob.TimeTest1()
    ob.TimeTest2()
    ob.LogOperation(item)

下面是正在生成的日志文件

这些行

 write.writerow(self.LogFileHeader)
 write.writerows(DataList)
 DataList.append((Var1, self.T1, self.T2, self.TimeDiff))

如果你把它们改写成

 DataList.append((Var1, self.T1, self.T2, self.TimeDiff))
 write.writerow(self.LogFileHeader)
 write.writerows(DataList)

---

写完行后，您正在添加列表。

Gosh！我错过了细节。多谢。