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Bug report
Checklist
- I am confident this is a bug in CPython,
not a bug in a third-party project - I have searched the CPython issue tracker,
and am confident this bug has not been reported before
A clear and concise description of the bug
After using basicConfig or dictConfig for a logger, handlers attribute would still be [] while hasHandlers equals True. Even though handlers is empty, StreamHandler still works and prints out log messages.
Code:
import logging
import logging.config
basic_logger = logging.getLogger("basic")
print(f"hasHandlers: {basic_logger.hasHandlers()}, handlers: {basic_logger.handlers}")
basic_logger.error("1")
logging.basicConfig(level=logging.INFO)
print(f"hasHandlers: {basic_logger.hasHandlers()}, handlers: {basic_logger.handlers}")
basic_logger.error("2")
config = {
"version": 1.0,
"handlers": {
"console": {
"class": "logging.StreamHandler",
"level": "DEBUG",
"stream": "ext://sys.stdout"
}
},
"root": {
"level": "DEBUG",
"handlers": ["console"]
}
}
logging.config.dictConfig(config)
dict_logger = logging.getLogger("dict")
print(f"hasHandlers: {dict_logger.hasHandlers()}, handlers: {dict_logger.handlers}")
dict_logger.error("3")Output:
hasHandlers: False, handlers: []
hasHandlers: True, handlers: []
hasHandlers: True, handlers: []
3
1
ERROR:basic:2
Your environment
- CPython versions tested on: Python 3.9.16
- Operating system and architecture: MacOS Monterey 12.6.1
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