将文本追加到带有时间戳的文本文件

Question

我想将python代码的输出追加到文本文件中。以上是我的Python代码，我每2小时循环它

if response == 0: 
print(hostname, "is up") 

if option == 1: 
    print(option, "is the option') 
    print('this is option number 1') 
elif option == 2: 
    print(option, "is the option') 
    print('this is option number 2') 
else: 
    print(option, "is the other option') 
    print('this is the result of other option') 

我注意到我需要下面的代码将结果追加到文本文件。

with open("test.txt", "a") as myfile: 
myfile.write("appended text") 

如何将每个输出记录到文本文件并包含时间戳？例如

09:10 192.168.0.1 is up 
09:10 1 is the option 
09:11 this is option number 1 
11:15 192.168.0.1 is up 
11:10 1 is the option 
11:11 this is option number 1 
13:10 192.168.0.1 is up 
13:10 3 is the other option 
13:11 this is the result of other option 

Answer 1

Python中确实有一个日志库，你可以使用的，但如果你希望让自己的，那么你可以采取以下方法。

这里有两个函数，write_log()它接受你正在使用的参数并创建一些日志条目。然后，这个函数调用write_logline()每个部分写入到两个屏幕（可选），也与时间戳文件包括：

from datetime import datetime 

def write_logline(logfile, text): 
    now = datetime.strftime(datetime.now(), '%H:%M') 
    log_text = '{} {}\n'.format(now, text) 
    print(log_text, end='')  # also display log info, comment out if not needed 
    logfile.write(log_text) 


def write_log(response, hostname, option): 

    with open("test.txt", "a") as logfile: 
     if response == 0: 
      write_logline(logfile, '{} is up'.format(hostname)) 

     if option == 1: 
      write_logline(logfile, '{} is the option'.format(option)) 
      write_logline(logfile, 'this is option number 1') 
     elif option == 2: 
      write_logline(logfile, '{} is the option'.format(option)) 
      write_logline(logfile, 'this is option number 2') 
     else: 
      write_logline(logfile, '{} is the other option'.format(option)) 
      write_logline(logfile, 'this is the result of other option') 

write_log(0, '192.168.0.1', 1) 
write_log(0, '192.168.0.1', 1) 
write_log(0, '192.168.0.1', 3) 

作为替代方案，你可以考虑写你的记录功能作为一个Python类。这样可以节省你不必跟踪文件句柄，并允许您使用Python的with声明：

class LogTimestamp: 

    def __init__(self, log_filename): 
     self.log_filehandle = open(log_filename, 'a') 

    def __enter__(self): 
     return self 

    def __exit__(self, *args): 
     self.log_filehandle.close()    

    def write_logline(self, text): 
     now = datetime.strftime(datetime.now(), '%H:%M') 
     log_text = '{} {}\n'.format(now, text) 
     print(log_text, end='')  # also display log info, comment out if not needed 
     self.log_filehandle.write(log_text) 

    def write(self, response, hostname, option): 
     if response == 0: 
      self.write_logline('{} is up'.format(hostname)) 

     if option == 1: 
      self.write_logline('{} is the option'.format(option)) 
      self.write_logline('this is option number 1') 
     elif option == 2: 
      self.write_logline('{} is the option'.format(option)) 
      self.write_logline('this is option number 2') 
     else: 
      self.write_logline('{} is the other option'.format(option)) 
      self.write_logline('this is the result of other option') 


# Write 3 entries to the log 

with LogTimestamp('test.txt') as log: 
    log.write(0, '192.168.0.1', 1) 
    log.write(0, '192.168.0.1', 2) 
    log.write(0, '192.168.0.1', 3) 

两个版本会给你一个输出文件看起来像：

09:51 192.168.0.1 is up 
09:51 1 is the option 
09:51 this is option number 1 
09:51 192.168.0.1 is up 
09:51 2 is the option 
09:51 this is option number 2 
09:51 192.168.0.1 is up 
09:51 3 is the other option 
09:51 this is the result of other option