Python 日志記錄：自定義記錄器沒有輸出

Question

使用教程： https://realpython.com/python-logging/ ，我有以下腳本，只包含：

import logging

# Create a custom logger
logger = logging.getLogger(__name__)

# Create handlers
c_handler = logging.StreamHandler()
f_handler = logging.FileHandler('file.log')
c_handler.setLevel(logging.INFO)
f_handler.setLevel(logging.DEBUG)

# Create formatters and add it to handlers
c_format = logging.Formatter('%(name)s - %(levelname)s - %(message)s')
f_format = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
c_handler.setFormatter(c_format)
f_handler.setFormatter(f_format)

# Add handlers to the logger
logger.addHandler(c_handler)
logger.addHandler(f_handler)

logger.debug('I am a debug msg')
logger.info('I am an info msg')

這應該將字符串寫入控制台和文件（'file.log'）。 文件已創建，bot 沒有內容。 而且控制台也沒有輸出。 任何可能導致這種情況的想法，或者缺少什么？

Answer 1

您忘記為記錄器本身設置詳細級別：

import logging

# Create a custom logger
logger = logging.getLogger(__name__)
logger.setLevel(logging.DEBUG) # The logger still needs its verbose level

# Create handlers
c_handler = logging.StreamHandler()
f_handler = logging.FileHandler('file.log')
c_handler.setLevel(logging.INFO)
f_handler.setLevel(logging.DEBUG)

# Create formatters and add it to handlers
c_format = logging.Formatter('%(name)s - %(levelname)s - %(message)s')
f_format = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
c_handler.setFormatter(c_format)
f_handler.setFormatter(f_format)

# Add handlers to the logger
logger.addHandler(c_handler)
logger.addHandler(f_handler)

logger.debug('I am a debug msg')
logger.info('I am an info msg')

此外，我建議根據每個處理程序阻止您的代碼，而不是類似的語法：

import logging

# Create a custom logger
logger = logging.getLogger(__name__)
logger.setLevel(logging.DEBUG)

# Streaming Handler
c_handler = logging.StreamHandler()
c_handler.setLevel(logging.INFO)
c_format = logging.Formatter('%(name)s - %(levelname)s - %(message)s')
c_handler.setFormatter(c_format)
logger.addHandler(c_handler)

# File Handler
f_handler = logging.FileHandler('file.log')
f_handler.setLevel(logging.DEBUG)
f_format = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
f_handler.setFormatter(f_format)
logger.addHandler(f_handler)

logger.debug('I am a debug msg')
logger.info('I am an info msg')