Python ValueError while attempting a dictionary based logging configuration - python-3.x

Question

I'm trying to code a dictionary based logging configuration and have been stumped by a ValueError that occurs when I run the program. I've stripped it down to the essentials and the problem remains. I've read the 3.5 docs, logging HOWTO, Logging Cookbook, etc. but unfortunately, the solution has not presented itself. Any help would be appreciated.
Also, I'm only 3 weeks into python so I may just be out of my depth at this point. Here's the code...
import logging.config
log_config = {
'version': 1,
'disable_existing_loggers': False,
'formatters':{
'verbose_formatter':{
'format':'%(levelname)s: %(name)s: %(asctime)s.%(msecs).03d : '\
'%(message)s: %(process)s: %(processName)s',
'datefmt':'%Y-%m-%d %H:%M:%S'
},
'precise_formatter':{
'format':'%(levelname)s: %(name)s: %(asctime)s.%(msecs).03d : '\
'%(message)s',
'datefmt':'%Y-%m-%d %H:%M:%S'
},
'brief_formatter':{
'format':'%(levelname)s: %(message)s'
}
},
'handlers':{
'con_handler':{
'class':'logging.StreamHandler',
'level':'DEBUG',
'formatter':'precise_formatter',
'stream':'ext://sys.stdout'
},
'file_handler':{
'class':'logging.handlers.RotatingFileHandler',
'filename':'logger.log',
'maxBytes':1048576,
'backupCount':4,
'level':'DEBUG',
'formatter':'precise_formatter',
'encoding':'utf8'
}
},
'loggers':{
'level':'DEBUG',
'handlers':['con_handler', 'file_handler']
}
}
logging.config.dictConfig(log_config)
logger = logging.getLogger(__name__)
logger.critical('This should always be seen!')
When run, I receive the follow:
ValueError was unhandled by user code
Message: Unable to configure logger 'handlers': 'ConvertingList' object has no attribute 'get'
or sometimes this...
ValueError was unhandled by user code
Message: Unable to configure logger 'level': 'str' object has no attribute 'get'
I suspect that the different errors may have to do with the sometimes changing order of the dictionary?

Answer 1

Change the loggers section to
'loggers':{
'': {
'level':'DEBUG',
'handlers':['con_handler', 'file_handler']
}
}
The '' (empty string) refers to the root logger. you can add more loggers for different components:
'loggers':{
'': {
'level':'DEBUG',
'handlers':['con_handler', 'file_handler']
}
'bottle': { #I only want error level from bottle :)
'level':'ERROR',
'handlers':['con_handler', 'file_handler']
}
}

Answer 2

To config the root logger use a root key of your log_config dictionary.
root - this will be the configuration for the root logger.
Source: Dictionary Schema Details
Following this description your config should look something like this:
log_config = {
...
'handlers': {
'con_handler': ...,
'file_handler': ...
},
'loggers': {
'other_logger': ...
},
'root': {
'level': 'DEBUG',
'handlers': ['con_handler', 'file_handler']
}
}