我怎样才能得到所有可能的日志级别的数组？

Question

I wish to get all possible, current, log levels in the application. I am using the standard logging library for python 2.7.

Something along the lines of:

logging.getLevels()
[DEBUG, INFO, WARNING, ERROR, CRITICAL]

My use case for this, would be to pass it into argsparse. We define some custom log levels in our application, and it would be nice for those to automatically propagate into argparse.

parser = argparse.ArgumentParser('our app')
parser.add_argument('-l', '--loglevel', type=str, help='Log level', 
choices=logging.getLevels(), default='WARNING')

I can't find a function like this in the documentation . The closest I can find is getLevelName(int level) which will return the string based off an integer.

Answer 1

Following on from the question @ymbirtt linked, I worked out this: It calls the _levelNames and then traverses it making only to get the string answers.

[v for (k,v) in logging._levelNames.iteritems() if type(k) is int]

In python 3:

[v for (k,v) in logging._levelNames.items() if type(k) is int]

In the finished solution:

parser.add_argument('-l', '--loglevel', type=str, help='Log level', 
choices=[v for (k,v) in logging._levelNames.iteritems() if type(k) is int], 
default='WARNING')

Edit: Swapped value and key around keeps ordering

Answer 2

Maybe a shorter solution can be:

list(logging._levelToName.values())
# ['CRITICAL', 'ERROR', 'WARNING', 'INFO', 'DEBUG', 'NOTSET']