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Python编程实战100例-9

  • 2026-06-30 03:37:50
Python编程实战100例-9

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Part.1

案例说明

本节案例代码主要是对日志文件中新写入的数据进行提取分析,过滤出影响安全的数据并发出警告,数据恢复正常时则接触警报,样例的代码如下:

Part.1

源代码

import timedef read_lastline(filename):with open(filename, 'r'as f:line_=f.seek(0,2)print(line_)while True:line_content=f.readline()if not line_content:time.sleep(0.5)continueyield line_contentdef show(line_content):fields = line_content.split('\t')if ((fields[3] == '瓦斯or fields[3] == 'CO'and fields[5][0:5] == '越上限报警'):print('警报!!!', fields[4], '', fields[3], fields[5][0:-1], '发生时间:', fields[0][0:], ',请立即处理!')if ((fields[3] == '瓦斯or fields[3] == 'CO'and fields[5][0:4] == '报警解除'):print('通告!', fields[4], '', fields[3], '超值危险报警解除,解除时间:', fields[0][0:])if __name__ == '__main__':for line in read_lastline('safe.log'):if line.strip() !='':show(line)

Part.1

代码学习

代码

解释

with   open(filename, 'r') as f:

以只读方式打开 filename 文件,并把文件对象命名为 f,在代码块结束后自动关闭文件,常用的文件打开形式。

line_=f.seek(0,2)

这里的f就是上述命名后的文件调用,seek()函数一般为seekoffset,intval),功能是将文件的读取指针移动到指定位置,参数offset代表偏移量,intval代表位置,0代表文件开头,1代表当前读取指针位置,2代表文件末尾,这里就代表文件的末尾,实时监测。

while   True:

无限循环,死循环

line_content   = f.readline()

从当前的指针位置开始读取一行

if   not line_content:

time.sleep(0.5)

continue

if   not line_content:等价于if line_content == '':代表如果没有读取到文本

time.sleep(0.5)

代表让程序暂停0.5s,避免cpu一直占用进行读取。

Continue代表跳过本次循环的剩余代码,也就自动跳过了yield语句,之后再次开始循环,直到读取到内容,if not   line_content:判断失败后开始执行yield语句

这段代码其实很关键,注意continue的缩进在if后面也就是属于if语句,如果这里缩进提前,那么即使有内容也会跳过,代码就失效了

yield   line_content

生成器函数,代表读取到的代码交出去,并且暂停代码,直到下文中的if语句返回这里提交的内容为止。

fields   = line_content.split('\t')

分割读取到的这一行,并且返回为列表形式,分割原则为制表符tab,也就是这里的\t

fields[5][0:5]

下文就是对于上面分割后的列表元素的索引判断,需要注意的是列表索引从0开始,这里的fields[5][0:5]代表的是列表中的第6个元素中的0-5个字符是……

if   line.strip() !='':

判断日志行去掉空白字符后是否还有有效内容,避免空行导致程序出错。!=代表不等于。

需要注意的是这里虽然用来for函数遍历,但是要注意上面yield提交的为整行,也就是For的遍历以整行为单位,line代表一整行内容

Part.1

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  1. CONNECT:[ UseTime:0.000614s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000779s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000303s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000304s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000557s ]
  6. SELECT * FROM `set` [ RunTime:0.000209s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000563s ]
  8. SELECT * FROM `article` WHERE `id` = 492794 LIMIT 1 [ RunTime:0.001011s ]
  9. UPDATE `article` SET `lasttime` = 1783091662 WHERE `id` = 492794 [ RunTime:0.010614s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000323s ]
  11. SELECT * FROM `article` WHERE `id` < 492794 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.003912s ]
  12. SELECT * FROM `article` WHERE `id` > 492794 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004437s ]
  13. SELECT * FROM `article` WHERE `id` < 492794 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004353s ]
  14. SELECT * FROM `article` WHERE `id` < 492794 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002050s ]
  15. SELECT * FROM `article` WHERE `id` < 492794 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006465s ]
0.106556s