2018年5月26日笔记

• 习题1

先在utils.py文件中定义一个工具类

 1 # utils.py
 2 
 3 import os
 4 import threading
 5 import codecs
 6 
 7 
 8 class WriteLog(threading.Thread):
 9     def __init__(self, logName):
10         super(WriteLog,  self).__init__()
11         self.logName = logName
12         self.lock = threading.Lock()
13         self.contexts = []
14         self.mkfile()
15 
16     def mkfile(self):
17         if not os.path.exists(self.logName):
18             with codecs.open(self.logName, 'w') as f:
19                 f.write("This file is log for {0}\n".format(self.logName))
20 
21     def write(self, context):
22         self.contexts.append(context)
23 
24     def run(self):
25         while 1:
26             self.lock.acquire()
27             if len(self.contexts) != 0:
28                 with codecs.open(self.logName, "a") as f:
29                     for context in self.contexts:
30                         f.write(context)
31                 del self.contexts[:]
32             self.lock.release()

在写主程序main.py，来实现将日志记录到main.log文件中

 1 # main.py
 2 
 3 from utils import WriteLog
 4 import time
 5 import sys
 6 # reload(sys)           # 这是python2的写法(进行编码转换)，但是在python3中这个需要已经不存在了，这么做也不会什么实际意义。
 7 # sys.setdefaultencoding("utf-8")
 8 
 9 
10 def Xh():
11     for i in range(100):
12         print(i)
13         # 相当于sys.stdout.write(str(i))
14         time.sleep(0.1)
15 
16 
17 def main():
18     writeLog = WriteLog("main.log")
19     writeLog.start()
20     sys.stdout = writeLog
21     sys.stderr = writeLog
22     Xh()
23 
24 
25 if __name__ == "__main__":
26     main()

最终生成的日志文件main.log如下：

  1 This file is log for main.log
  2 0
  3 1
  4 2
  5 3
  6 4
  7 5
  8 6
  9 7
 10 8
 11 9
 12 10
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• 习题2

先写一个utils2.py

 1 from threading import Thread, Lock
 2 import codecs
 3 import os
 4 
 5 
 6 class TraceLog(Thread):
 7     def __init__(self, logName):
 8         super(TraceLog, self).__init__()
 9         self.logName = logName
10         self.lock = Lock()
11         self.contexts = []
12         self.isFile()
13 
14     def isFile(self):
15         if not os.path.exists(self.logName):
16             with codecs.open(self.logName, 'w') as f:
17                 f.write("this log name is: {0}\n".format(self.logName))
18                 f.write("start log\n")
19 
20     def write(self, context):
21         self.contexts.append(context)
22 
23     def run(self):
24         while 1:
25             self.lock.acquire()
26             if len(self.contexts) !=0:
27                 with codecs.open(self.logName, "a") as f:
28                     for context in self.contexts:
29                         f.write(context)
30                 del self.contexts[:]        # 注意不能忘记清空
31             self.lock.release()

再在main2.py中定义写主函数

 1 '''
 2 不断记录服务端输入的日志
 3 实现>> 和>
 4 '''
 5 
 6 
 7 
 8 from utils2 import TraceLog
 9 import time
10 import sys
11 
12 class Server(object):
13     def printLog(self):
14         print("start server\n")
15         for i in range(100):
16             print(i)
17             time.sleep(0.1)
18         print("end server\n")
19 
20 
21 
22 if __name__ == '__main__':
23     traceLog = TraceLog("main2.log")
24     traceLog.start()
25     sys.stdout = traceLog
26     sys.stderr = traceLog
27     server = Server()
28     server.printLog()
29 
30 # 每当调用print的时候，底层就是在代用sys.stdout.write(str)
31 # sys.stdout.write() = traceLog.write()

生成日志文件main2.log如下：

  1 this log name is: main2.log
  2 start log
  3 start server
  4 
  5 0
  6 1
  7 2
  8 3
  9 4
 10 5
 11 6
 12 7
 13 8
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 17 12
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104 99
105 end server

• 习题3

写一个celery配置文件celeryconfig.py

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 1 from kombu import Queue, Exchange
 2 
 3 BROKER_URL = "redis://192.168.48.136:6379/1"
 4 CELERY_RESULT_BACKEND = "redis://192.168.48.136:6379/2"
 5 
 6 
 7 CELERY_QUEUES = {
 8     Queue("default",Exchange("default"),routing_key="default"),
 9     Queue("for_task_A",Exchange("for_task_A"),routing_key="for_task_A"),
10     Queue("for_task_B",Exchange("for_task_B"),routing_key="for_task_B")
11 }
12 
13 CELERY_ROUTES = {
14     "demon3.taskA":{"queue":"for_task_A","routing_key":"for_task_A"},
15     "demon3.taskB":{"queue":"for_task_B","routing_key":"for_task_B"}
16 }
17 CELERY_TIMEZONE = 'UTC'
18 CELERYBEAT_SCHEDULE = {
19     'taskA_schedule' : {
20         'task':'demon3.taskA',
21         'schedule':2,
22         'args':(5,6)
23     },
24     'taskB_scheduler' : {
25         'task':"demon3.taskB",
26         "schedule":10,
27         "args":(10,20,30)
28     },
29     'add_schedule': {
30         "task":"demon3.add",
31         "schedule":5,
32         "args":(1,2)
33     }
34 }

编写tasks.py

 1 from celery import Celery
 2 
 3 app = Celery()
 4 app.config_from_object("celeryconfig")
 5 
 6 @app.task
 7 def taskA(x, y):
 8     return x*y
 9 
10 @app.task
11 def taskB(x, y, z):
12     return x+y+z
13 
14 @app.task
15 def add(x, y):
16     return x+y

编写demon.py

 1 from celery import Celery
 2 
 3 app = Celery()
 4 app.config_from_object("celeryconfig")
 5 
 6 @app.task
 7 def taskA(x, y):
 8     return x*y
 9 
10 @app.task
11 def taskB(x, y, z):
12     return x+y+z
13 
14 @app.task
15 def add(x, y):
16     return x+y

编写test.py

 1 import time
 2 
 3 from demon import *
 4 
 5 re1 = taskA.delay(10, 20)
 6 
 7 re2 = taskB.delay(5, 15, 25)
 8 
 9 re3 = add.delay(8, 18)
10 
11 time.sleep(1)
12 print(re1.result)
13 print(re2.result)
14 print(re3.status)
15 print(re3.result)