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I have some code to set up a log in Python 2.7 (using the logging module):
import os
import logging
logger=logging.getLogger(__name__)
logger.setLevel(logging.DEBUG)
log_filename=os.path.join(os.path.dirname(copasi_file),os.path.split(copasi_file)[1][:-4]+'_log.log')
handler=logging.FileHandler(log_filename,mode='w')
formatter = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s - %(message)s")
handler.setFormatter(formatter)
logger.addHandler(handler)
logger.debug('debugging message')
This code works and I am getting the output, however I intend to use this log to do a lot of debugging so I want to overwrite the log file each time its run. In the docs say to use the mode keyword argument to the 'FileHandler. It doesn't specify precisely *which* mode to use for overwrite file each time but I think a reasonable assumption would bemode='w'`. This however doesn't work. Can anybody tell me why?
532
The filemode can be changed to write mode, which will overwrite the previous logs and only save the current ones. Since the filemode is set to w , this means that the log file will be opened in write mode each time basicConfig() is run, which will ultimately overwrite the file.
FileHandler. The FileHandler class, located in the core logging package, sends logging output to a disk file. It inherits the output functionality from StreamHandler . Returns a new instance of the FileHandler class.
Example 1: Using the open() method to overwrite a file. It will delete the existing content from a file first; then, we can write new content and save it.
This solves problem for me:
handler = logging.FileHandler(log_filename, 'w+')
The problem is that the file doesn't actually get overwritten until a new python shell is started.
8
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