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pythonpython-3.xloggingpython-2.xsix

List of logging levels compatibility between Python 2 and Python 3

To have a list of logging levels in Python 2 I have to call this:

logging._levelNames.keys()

While Python 3 logging module has this:

list(logging._nameToLevel)

I am just adding six to my project to provide compatibility between Python 2 and Python 3. What is the cleanest way to figure out this compatibility issue?

Solution

  • You shouldn’t deliberately access a attribute that starts with a _, it usually means that it’s a private attribute and that shouldn’t be used elsewhere.

    And since the logging levels is just a short list, you can just copy and paste and create your own list instead:

    levels = ['CRITICAL', 'FATAL', 'ERROR', 'WARN', 'WARNING', 'INFO', 'DEBUG', 'NOTSET']

    Btw, if you noticed, the logging._levelNames.keys() and list(logging._nameToLevel) provides different results, the former also contains some integers [0, 10, 20, 30, 40, 50] while the latter does not.