第17课 调试程序

Posted 2021-01-31 nick1998

一、调试程序

1、为什么要调试

1）程序往往不像我们设想的那样运行

2）调试可以定位问题的根源所在，从而解决问题。

2、调试方法

1）断点+跟踪，举例如下：

‘‘‘
现有一个数据库记录文件（见附件0005_1.txt），保存了学生课程签到的数据库记录。 内容格式如下 ，

(‘2017-03-13 11:50:09‘, 271, 131),
(‘2017-03-14 10:52:19‘, 273, 131),
(‘2017-03-13 11:50:19‘, 271, 126),
每一行记录保存了学生的一次签到信息。

每一次签到信息的记录，分为三个部分， 分别是签到时间、签到课程的id号、签到学生的id号

要求大家实现下面的函数。其中参数fileName 为 数据库记录文件路径， 输出结果是将数据库记录文件中的学生签到信息保存在一个字典对象中，并作为返回值返回。

def putInfoToDict(fileName):

要求返回的字典对象的格式是这样的：

key 是各个学生的id号， value是 该学生的签到信息

   其中value，里面保存着该学生所有签到的信息

       其中每个签到的信息是字典对象，有两个元素： key 是lessonid的 记录课程id，key是checkintime的 记录签到时间

比如，对于上面的示例中的3条记录，相应的返回结果如下：

{
    131: [
        {‘lessonid‘: 271,‘checkintime‘:‘2017-03-13 11:50:09‘},
        {‘lessonid‘: 273,‘checkintime‘:‘2017-03-14 10:52:19‘},
    ],


    126: [
        {‘lessonid‘: 271,‘checkintime‘:‘2017-03-13 11:50:19‘},
    ],

}

需求分解：

1、学生课程签到信息

1）时间、课程ID、学生ID

2）格式：有特定要求

2、要求：

1）定义一个函数：def putInfoToDict(fileName)

2）return ----dict

3）格式输出：

        {
            学生ID：
                    [
                        {课程ID:XXXXX, 签到时间：XXXX}
                        {课程ID：XXXX, 签到时间：XXXX}

                    ]
        }

思路分解

1、获取信息

1）1、userId       2、lessonId　　3、checkTime：从数据库文件获取

　　读取文件：‘/‘       ‘\\‘       r‘ ‘

　　with open(‘fileDir‘) as rFile == open (‘fileDir‘)

2）lines = rFile.read().splitlines()---读取每行内容

3）组织dict，格式打印

a、from pprint import pprint----美化打印

      pprint(filedir)

2、debug知识点汇总

1）打完断点用debug模式运行

2）断点停留的行，并没有执行

3）如果需要直接从第一个断点跳转到第二个断点，方法如下：

a、当程序停在第一个断点的时候，点击debug按钮

b、然后点击菜单栏的Run—>Resume Programs，直接跳转到第二个断点

 

4）在调试的时候，经常遇到以下几个按钮，这里给出说明

a、Step Over：在单步执行时，在函数内遇到子函数时不会进入子函数内单步执行，而是将子函数整个执行完再停止，也就是把子函数整个作为一步。有一点，经过我们简单的调试，在不存在子函数的情况下是和Step Into效果一样的（简而言之，越过子函数，但子函数会执行）。

b、Step Into：单步执行，遇到子函数就进入并且继续单步执行（简而言之，进入子函数）。

c、Step Into My Code：进入自己编写的函数，不进入系统函数，很少用到。

d、Force Step Into：强制进入，在调试的时候能进入任何方法

 

e、Step Out：当单步执行到子函数内时，用Step Out就可以执行完子函数余下部分，并返回到上一层函数。

f、Run to Cursor：一直执行，到光标处停止，用在循环内部时，点击一次就执行一个循环。

作者：polyhedronx 
来源：CSDN 
原文：https://blog.csdn.net/polyhedronx/article/details/81514437

g、 重新进行debug

h、viewbreakpoints：显示所有断点

并且可以选择或者取消

 

参考代码如下：

import pprint
fileDir = ‘0005_1.txt‘
def putInfoToDict(fileName):
    outInfoDict = {}
    with open(fileDir) as rFile:
        lines = rFile.read().splitlines()
        for line in lines:
            line = line.replace(‘(‘, ‘‘).replace(‘)‘, ‘‘).replace("‘", ‘‘).replace(‘	‘, ‘‘).replace(‘;‘, ‘‘)
            temp = line.split(‘,‘)
            userId = int(temp[2].strip())
            lessonId = int(temp[1].strip())
            checkTime = temp[0].strip()
            toDict = {‘lessonid‘: lessonId, ‘checktime‘: checkTime}
            if userId not in outInfoDict:  # 如果userId（key）没在这个字典中
                outInfoDict[userId] = []  # 则先添加这个key的value为空列表
            outInfoDict[userId].append(toDict)  # 然后再添加key和value到outInfoDict
    return outInfoDict

pprint.pprint(putInfoToDict(fileDir))

执行结果如下：

{34: [{‘checktime‘: ‘2017-03-13 12:00:18‘, ‘lessonid‘: 271}],
 35: [{‘checktime‘: ‘2017-03-13 11:52:07‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-14 00:53:26‘, ‘lessonid‘: 272},
      {‘checktime‘: ‘2017-03-14 11:50:59‘, ‘lessonid‘: 273}],
 37: [{‘checktime‘: ‘2017-03-13 11:52:44‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-14 11:56:43‘, ‘lessonid‘: 273},
      {‘checktime‘: ‘2017-03-16 00:53:36‘, ‘lessonid‘: 274}],
 38: [{‘checktime‘: ‘2017-03-13 11:51:48‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-14 00:50:07‘, ‘lessonid‘: 272},
      {‘checktime‘: ‘2017-03-14 11:51:54‘, ‘lessonid‘: 273},
      {‘checktime‘: ‘2017-03-16 00:50:06‘, ‘lessonid‘: 274}],
 39: [{‘checktime‘: ‘2017-03-14 12:06:28‘, ‘lessonid‘: 273}],
 40: [{‘checktime‘: ‘2017-03-13 11:52:01‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-14 12:06:04‘, ‘lessonid‘: 273}],
 43: [{‘checktime‘: ‘2017-03-13 11:52:46‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-14 11:51:00‘, ‘lessonid‘: 273}],
 45: [{‘checktime‘: ‘2017-03-13 12:02:27‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-14 00:55:49‘, ‘lessonid‘: 272},
      {‘checktime‘: ‘2017-03-14 11:58:01‘, ‘lessonid‘: 273}],
 46: [{‘checktime‘: ‘2017-03-13 11:59:18‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-14 11:57:26‘, ‘lessonid‘: 273}],
 51: [{‘checktime‘: ‘2017-03-13 11:51:41‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-14 00:51:12‘, ‘lessonid‘: 272},
      {‘checktime‘: ‘2017-03-14 11:55:04‘, ‘lessonid‘: 273},
      {‘checktime‘: ‘2017-03-16 00:54:52‘, ‘lessonid‘: 274}],
 53: [{‘checktime‘: ‘2017-03-13 11:51:41‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-14 11:56:59‘, ‘lessonid‘: 273}],
 54: [{‘checktime‘: ‘2017-03-14 00:56:23‘, ‘lessonid‘: 272},
      {‘checktime‘: ‘2017-03-14 12:03:42‘, ‘lessonid‘: 273}],
 55: [{‘checktime‘: ‘2017-03-13 11:56:44‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-14 11:53:56‘, ‘lessonid‘: 273},
      {‘checktime‘: ‘2017-03-16 00:58:57‘, ‘lessonid‘: 274}],
 56: [{‘checktime‘: ‘2017-03-13 11:53:39‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-14 00:52:16‘, ‘lessonid‘: 272},
      {‘checktime‘: ‘2017-03-14 11:52:24‘, ‘lessonid‘: 273},
      {‘checktime‘: ‘2017-03-16 01:07:59‘, ‘lessonid‘: 274}],
 57: [{‘checktime‘: ‘2017-03-16 00:50:40‘, ‘lessonid‘: 274}],
 59: [{‘checktime‘: ‘2017-03-14 11:51:32‘, ‘lessonid‘: 273}],
 60: [{‘checktime‘: ‘2017-03-13 12:05:52‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-14 11:57:14‘, ‘lessonid‘: 273},
      {‘checktime‘: ‘2017-03-16 01:03:04‘, ‘lessonid‘: 274}],
 61: [{‘checktime‘: ‘2017-03-13 11:58:18‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-14 01:07:16‘, ‘lessonid‘: 272},
      {‘checktime‘: ‘2017-03-14 11:57:50‘, ‘lessonid‘: 273}],
 62: [{‘checktime‘: ‘2017-03-16 00:58:14‘, ‘lessonid‘: 274}],
 64: [{‘checktime‘: ‘2017-03-13 11:51:32‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-14 00:54:01‘, ‘lessonid‘: 272},
      {‘checktime‘: ‘2017-03-14 11:52:50‘, ‘lessonid‘: 273},
      {‘checktime‘: ‘2017-03-16 00:51:37‘, ‘lessonid‘: 274}],
 66: [{‘checktime‘: ‘2017-03-13 11:59:01‘, ‘lessonid‘: 271}],
 67: [{‘checktime‘: ‘2017-03-13 11:51:48‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-14 00:51:51‘, ‘lessonid‘: 272},
      {‘checktime‘: ‘2017-03-14 11:50:13‘, ‘lessonid‘: 273},
      {‘checktime‘: ‘2017-03-16 00:51:09‘, ‘lessonid‘: 274}],
 68: [{‘checktime‘: ‘2017-03-13 11:52:21‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-14 11:59:06‘, ‘lessonid‘: 273},
      {‘checktime‘: ‘2017-03-16 00:50:13‘, ‘lessonid‘: 274}],
 69: [{‘checktime‘: ‘2017-03-13 11:58:01‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-14 11:55:56‘, ‘lessonid‘: 273}],
 70: [{‘checktime‘: ‘2017-03-16 00:56:55‘, ‘lessonid‘: 274}],
 71: [{‘checktime‘: ‘2017-03-13 11:58:03‘, ‘lessonid‘: 271}],
 74: [{‘checktime‘: ‘2017-03-13 11:58:29‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-14 00:57:44‘, ‘lessonid‘: 272},
      {‘checktime‘: ‘2017-03-14 11:53:24‘, ‘lessonid‘: 273}],
 75: [{‘checktime‘: ‘2017-03-13 12:00:14‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-14 00:55:50‘, ‘lessonid‘: 272},
      {‘checktime‘: ‘2017-03-14 11:52:45‘, ‘lessonid‘: 273},
      {‘checktime‘: ‘2017-03-16 00:51:58‘, ‘lessonid‘: 274}],
 76: [{‘checktime‘: ‘2017-03-13 11:58:30‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-14 11:57:51‘, ‘lessonid‘: 273}],
 77: [{‘checktime‘: ‘2017-03-13 11:52:14‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-14 11:55:11‘, ‘lessonid‘: 273},
      {‘checktime‘: ‘2017-03-16 00:50:37‘, ‘lessonid‘: 274}],
 78: [{‘checktime‘: ‘2017-03-13 11:54:17‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-14 00:58:36‘, ‘lessonid‘: 272},
      {‘checktime‘: ‘2017-03-14 12:01:29‘, ‘lessonid‘: 273},
      {‘checktime‘: ‘2017-03-16 00:52:33‘, ‘lessonid‘: 274}],
 79: [{‘checktime‘: ‘2017-03-13 11:50:55‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-16 00:50:15‘, ‘lessonid‘: 274}],
 81: [{‘checktime‘: ‘2017-03-13 11:52:30‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-14 11:51:18‘, ‘lessonid‘: 273}],
 82: [{‘checktime‘: ‘2017-03-13 11:51:41‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-14 11:58:11‘, ‘lessonid‘: 273}],
 83: [{‘checktime‘: ‘2017-03-13 11:59:14‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-14 01:04:52‘, ‘lessonid‘: 272},
      {‘checktime‘: ‘2017-03-14 11:56:55‘, ‘lessonid‘: 273},
      {‘checktime‘: ‘2017-03-16 01:03:06‘, ‘lessonid‘: 274}],
 85: [{‘checktime‘: ‘2017-03-13 11:50:25‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-14 00:50:34‘, ‘lessonid‘: 272},
      {‘checktime‘: ‘2017-03-14 11:51:07‘, ‘lessonid‘: 273},
      {‘checktime‘: ‘2017-03-16 00:53:45‘, ‘lessonid‘: 274}],
 87: [{‘checktime‘: ‘2017-03-13 12:05:23‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-14 00:51:25‘, ‘lessonid‘: 272},
      {‘checktime‘: ‘2017-03-14 11:53:44‘, ‘lessonid‘: 273}],
 88: [{‘checktime‘: ‘2017-03-13 11:56:58‘, ‘lessonid‘: 271}],
 90: [{‘checktime‘: ‘2017-03-13 11:54:27‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-14 00:56:13‘, ‘lessonid‘: 272}],
 91: [{‘checktime‘: ‘2017-03-13 11:58:53‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-14 11:53:37‘, ‘lessonid‘: 273}],
 92: [{‘checktime‘: ‘2017-03-14 11:51:52‘, ‘lessonid‘: 273}],
 93: [{‘checktime‘: ‘2017-03-13 12:00:39‘, ‘lessonid‘: 271}],
 94: [{‘checktime‘: ‘2017-03-13 12:03:30‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-14 11:52:08‘, ‘lessonid‘: 273}],
 95: [{‘checktime‘: ‘2017-03-13 12:07:28‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-14 01:02:38‘, ‘lessonid‘: 272},
      {‘checktime‘: ‘2017-03-14 11:53:02‘, ‘lessonid‘: 273},
      {‘checktime‘: ‘2017-03-16 01:02:47‘, ‘lessonid‘: 274}],
 96: [{‘checktime‘: ‘2017-03-13 11:56:04‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-14 00:56:02‘, ‘lessonid‘: 272},
      {‘checktime‘: ‘2017-03-14 12:02:44‘, ‘lessonid‘: 273},
      {‘checktime‘: ‘2017-03-16 00:59:30‘, ‘lessonid‘: 274}],
 98: [{‘checktime‘: ‘2017-03-13 11:51:43‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-14 00:54:50‘, ‘lessonid‘: 272},
      {‘checktime‘: ‘2017-03-14 11:56:55‘, ‘lessonid‘: 273},
      {‘checktime‘: ‘2017-03-16 00:50:25‘, ‘lessonid‘: 274}],
 99: [{‘checktime‘: ‘2017-03-13 11:54:24‘, ‘lessonid‘: 271},
      {‘checktime‘: ‘2017-03-14 11:58:07‘, ‘lessonid‘: 273}],
 101: [{‘checktime‘: ‘2017-03-13 11:57:14‘, ‘lessonid‘: 271}],
 102: [{‘checktime‘: ‘2017-03-13 12:05:30‘, ‘lessonid‘: 271},
       {‘checktime‘: ‘2017-03-14 00:56:35‘, ‘lessonid‘: 272},
       {‘checktime‘: ‘2017-03-14 11:53:24‘, ‘lessonid‘: 273},
       {‘checktime‘: ‘2017-03-16 00:54:26‘, ‘lessonid‘: 274}],
 103: [{‘checktime‘: ‘2017-03-13 11:55:22‘, ‘lessonid‘: 271},
       {‘checktime‘: ‘2017-03-14 11:51:10‘, ‘lessonid‘: 273},
       {‘checktime‘: ‘2017-03-16 00:54:48‘, ‘lessonid‘: 274}],
 104: [{‘checktime‘: ‘2017-03-13 11:55:49‘, ‘lessonid‘: 271},
       {‘checktime‘: ‘2017-03-14 00:54:22‘, ‘lessonid‘: 272},
       {‘checktime‘: ‘2017-03-14 11:54:40‘, ‘lessonid‘: 273},
       {‘checktime‘: ‘2017-03-16 00:51:11‘, ‘lessonid‘: 274}],
 105: [{‘checktime‘: ‘2017-03-14 11:51:17‘, ‘lessonid‘: 273}],
 106: [{‘checktime‘: ‘2017-03-13 11:55:28‘, ‘lessonid‘: 271},
       {‘checktime‘: ‘2017-03-14 11:51:11‘, ‘lessonid‘: 273}],
 107: [{‘checktime‘: ‘2017-03-13 11:57:33‘, ‘lessonid‘: 271},
       {‘checktime‘: ‘2017-03-14 01:05:49‘, ‘lessonid‘: 272},
       {‘checktime‘: ‘2017-03-14 12:02:18‘, ‘lessonid‘: 273},
       {‘checktime‘: ‘2017-03-16 00:50:49‘, ‘lessonid‘: 274}],
 108: [{‘checktime‘: ‘2017-03-13 11:52:13‘, ‘lessonid‘: 271},
       {‘checktime‘: ‘2017-03-14 00:51:34‘, ‘lessonid‘: 272},
       {‘checktime‘: ‘2017-03-14 11:50:46‘, ‘lessonid‘: 273}],
 109: [{‘checktime‘: ‘2017-03-13 11:50:44‘, ‘lessonid‘: 271},
       {‘checktime‘: ‘2017-03-14 11:56:23‘, ‘lessonid‘: 273}],
 110: [{‘checktime‘: ‘2017-03-13 11:51:58‘, ‘lessonid‘: 271},
       {‘checktime‘: ‘2017-03-14 00:53:51‘, ‘lessonid‘: 272},
       {‘checktime‘: ‘2017-03-14 11:52:20‘, ‘lessonid‘: 273},
       {‘checktime‘: ‘2017-03-16 00:53:03‘, ‘lessonid‘: 274}],
 111: [{‘checktime‘: ‘2017-03-13 11:56:32‘, ‘lessonid‘: 271},
       {‘checktime‘: ‘2017-03-14 11:57:24‘, ‘lessonid‘: 273},
       {‘checktime‘: ‘2017-03-16 00:52:15‘, ‘lessonid‘: 274}],
 113: [{‘checktime‘: ‘2017-03-13 12:00:08‘, ‘lessonid‘: 271},
       {‘checktime‘: ‘2017-03-14 00:59:01‘, ‘lessonid‘: 272},
       {‘checktime‘: ‘2017-03-14 11:53:40‘, ‘lessonid‘: 273},
       {‘checktime‘: ‘2017-03-16 00:59:30‘, ‘lessonid‘: 274}],
 114: [{‘checktime‘: ‘2017-03-13 11:54:47‘, ‘lessonid‘: 271},
       {‘checktime‘: ‘2017-03-14 00:51:29‘, ‘lessonid‘: 272},
       {‘checktime‘: ‘2017-03-14 11:51:28‘, ‘lessonid‘: 273},
       {‘checktime‘: ‘2017-03-16 00:51:31‘, ‘lessonid‘: 274}],
 115: [{‘checktime‘: ‘2017-03-13 11:52:18‘, ‘lessonid‘: 271},
       {‘checktime‘: ‘2017-03-14 00:50:13‘, ‘lessonid‘: 272},
       {‘checktime‘: ‘2017-03-14 11:51:19‘, ‘lessonid‘: 273},
       {‘checktime‘: ‘2017-03-16 00:50:17‘, ‘lessonid‘: 274}],
 116: [{‘checktime‘: ‘2017-03-13 11:51:02‘, ‘lessonid‘: 271},
       {‘checktime‘: ‘2017-03-14 00:52:11‘, ‘lessonid‘: 272},
       {‘checktime‘: ‘2017-03-14 11:52:56‘, ‘lessonid‘: 273},
       {‘checktime‘: ‘2017-03-16 00:50:04‘, ‘lessonid‘: 274}],
 118: [{‘checktime‘: ‘2017-03-13 11:50:31‘, ‘lessonid‘: 271}],
 119: [{‘checktime‘: ‘2017-03-13 11:50:34‘, ‘lessonid‘: 271},
       {‘checktime‘: ‘2017-03-14 11:55:13‘, ‘lessonid‘: 273}],
 120: [{‘checktime‘: ‘2017-03-14 11:50:31‘, ‘lessonid‘: 273},
       {‘checktime‘: ‘2017-03-16 00:58:28‘, ‘lessonid‘: 274}],
 121: [{‘checktime‘: ‘2017-03-13 11:50:58‘, ‘lessonid‘: 271},
       {‘checktime‘: ‘2017-03-14 00:55:18‘, ‘lessonid‘: 272},
       {‘checktime‘: ‘2017-03-14 11:50:25‘, ‘lessonid‘: 273},
       {‘checktime‘: ‘2017-03-16 00:56:13‘, ‘lessonid‘: 274}],
 122: [{‘checktime‘: ‘2017-03-13 11:51:39‘, ‘lessonid‘: 271},
       {‘checktime‘: ‘2017-03-14 00:57:06‘, ‘lessonid‘: 272},
       {‘checktime‘: ‘2017-03-14 11:53:33‘, ‘lessonid‘: 273},
       {‘checktime‘: ‘2017-03-16 00:53:23‘, ‘lessonid‘: 274}],
 123: [{‘checktime‘: ‘2017-03-13 11:51:38‘, ‘lessonid‘: 271},
       {‘checktime‘: ‘2017-03-14 00:57:08‘, ‘lessonid‘: 272},
       {‘checktime‘: ‘2017-03-16 00:54:19‘, ‘lessonid‘: 274}],
 124: [{‘checktime‘: ‘2017-03-16 00:56:58‘, ‘lessonid‘: 274}],
 125: [{‘checktime‘: ‘2017-03-13 11:51:05‘, ‘lessonid‘: 271},
       {‘checktime‘: ‘2017-03-14 00:54:55‘, ‘lessonid‘: 272},
       {‘checktime‘: ‘2017-03-14 11:53:04‘, ‘lessonid‘: 273},
       {‘checktime‘: ‘2017-03-16 01:00:03‘, ‘lessonid‘: 274}],
 126: [{‘checktime‘: ‘2017-03-13 11:50:19‘, ‘lessonid‘: 271},
       {‘checktime‘: ‘2017-03-14 00:50:53‘, ‘lessonid‘: 272},
       {‘checktime‘: ‘2017-03-14 11:50:49‘, ‘lessonid‘: 273},
       {‘checktime‘: ‘2017-03-16 00:57:22‘, ‘lessonid‘: 274}],
 127: [{‘checktime‘: ‘2017-03-13 11:52:27‘, ‘lessonid‘: 271},
       {‘checktime‘: ‘2017-03-14 11:58:47‘, ‘lessonid‘: 273}],
 128: [{‘checktime‘: ‘2017-03-13 11:51:44‘, ‘lessonid‘: 271}],
 129: [{‘checktime‘: ‘2017-03-13 11:52:22‘, ‘lessonid‘: 271},
       {‘checktime‘: ‘2017-03-14 00:52:11‘, ‘lessonid‘: 272},
       {‘checktime‘: ‘2017-03-14 11:53:31‘, ‘lessonid‘: 273},
       {‘checktime‘: ‘2017-03-16 00:52:54‘, ‘lessonid‘: 274}],
 130: [{‘checktime‘: ‘2017-03-13 11:54:19‘, ‘lessonid‘: 271},
       {‘checktime‘: ‘2017-03-14 01:04:26‘, ‘lessonid‘: 272},
       {‘checktime‘: ‘2017-03-14 11:53:39‘, ‘lessonid‘: 273},
       {‘checktime‘: ‘2017-03-16 01:02:29‘, ‘lessonid‘: 274}],
 131: [{‘checktime‘: ‘2017-03-13 11:50:09‘, ‘lessonid‘: 271},
       {‘checktime‘: ‘2017-03-14 00:51:38‘, ‘lessonid‘: 272},
       {‘checktime‘: ‘2017-03-14 11:52:02‘, ‘lessonid‘: 273},
       {‘checktime‘: ‘2017-03-16 00:55:41‘, ‘lessonid‘: 274}],
 132: [{‘checktime‘: ‘2017-03-13 12:06:41‘, ‘lessonid‘: 271}],
 133: [{‘checktime‘: ‘2017-03-13 11:53:10‘, ‘lessonid‘: 271},
       {‘checktime‘: ‘2017-03-14 00:53:31‘, ‘lessonid‘: 272},
       {‘checktime‘: ‘2017-03-14 11:52:52‘, ‘lessonid‘: 273},
       {‘checktime‘: ‘2017-03-16 00:58:27‘, ‘lessonid‘: 274}],
 134: [{‘checktime‘: ‘2017-03-13 12:06:31‘, ‘lessonid‘: 271}],
 135: [{‘checktime‘: ‘2017-03-13 11:59:40‘, ‘lessonid‘: 271},
       {‘checktime‘: ‘2017-03-14 00:58:14‘, ‘lessonid‘: 272},
       {‘checktime‘: ‘2017-03-14 12:00:07‘, ‘lessonid‘: 273},
       {‘checktime‘: ‘2017-03-16 00:51:30‘, ‘lessonid‘: 274}],
 136: [{‘checktime‘: ‘2017-03-14 11:56:54‘, ‘lessonid‘: 273}],
 138: [{‘checktime‘: ‘2017-03-14 11:53:33‘, ‘lessonid‘: 273}],
 139: [{‘checktime‘: ‘2017-03-14 11:58:32‘, ‘lessonid‘: 273}],
 141: [{‘checktime‘: ‘2017-03-14 11:50:15‘, ‘lessonid‘: 273}],
 142: [{‘checktime‘: ‘2017-03-14 11:55:46‘, ‘lessonid‘: 273},
       {‘checktime‘: ‘2017-03-16 00:51:19‘, ‘lessonid‘: 274}]}

 

二、问题分析

1、方法

1）debug常见于开发环境

2）查看关键变量的值

3）print信息或者log，常见于生产环境

2、两种方式的比较

1）print方式

常见于没有IDE的时候：

a、临时任务

b、生产环境：bug不方便重现；用log方法，tail、tailf查看日志文件

2）IDE debug

a、常用于开发过程中

b、更加方便、快捷

c、可以查看变量、表达式的值