Python日志記錄不會創建日志檔案的多個實體-有解無憂

我正在嘗試創建一個class可以使用保存的.log.

這是我的代碼：

import logging
from datetime import datetime
import sys
import os


class DummyLog:
    def __init__(self,
                 log_name: str = datetime.now().strftime('%d_%m_%Y__%H_%M_%S'),
                 logging_level: str = 'debug',
                 string_format: str = '%(asctime)s: %(levelname)s: %(message)s',
                 datetime_format: str = '%m/%d/%Y %I:%M:%S %p',
                 log_on_folder: bool = True,
                 log_folder_name: str = 'logs'
                 ):
        self.logName = log_name
        self.logger = None
        self.loggingLevel = logging_level
        self.stringFormat = string_format
        self.datetimeFormat = datetime_format

        if log_on_folder:
            if not os.path.exists(log_folder_name):
                os.mkdir(log_folder_name)
            self.logName = log_folder_name   '/'   self.logName

        self.initiateLogger()

    def initiateLogger(self):
        """ This function will initiate the logger as a single threaded log"""

        self.logger = logging.getLogger(self.logName)
        if self.loggingLevel == 'debug':
            self.loggingLevel = logging.DEBUG
        self.logger.setLevel(self.loggingLevel)
        logFormat = logging.Formatter(self.stringFormat, datefmt=self.datetimeFormat)

        # Creating and adding the console handler
        consoleHandler = logging.StreamHandler(sys.stdout)
        consoleHandler.setFormatter(logFormat)
        self.logger.addHandler(consoleHandler)

        # Creating and adding the file handler
        fileHandler = logging.FileHandler(self.logName   ".log", mode='w')
        fileHandler.setFormatter(logFormat)
        self.logger.addHandler(fileHandler)


dl = DummyLog()
dl.logger.info("hi")

import time
time.sleep(1)

dl1 = DummyLog()
dl1.logger.info("hi")

當我運行上面的代碼時，它只創建一個.log檔案，并且dl和dl1物件都被記錄在同一個.log檔案中。

控制臺輸出列印log3 次而不是 2 次：

01/03/2022 12:01:20 PM: INFO: hi
01/03/2022 12:01:21 PM: INFO: hi
01/03/2022 12:01:21 PM: INFO: hi

但我已經發起了class Dummylog兩次。我期待class DummyLog可以在多個實體中呼叫的代碼更改，并且每個實體將保存一個單獨的.log檔案。

我知道我在Handler.

任何幫助將不勝感激！！

uj5u.com熱心網友回復：

您的默認日志名稱基于時間，但準確性是第二個，您必須在記錄器實體之間休眠或使用非默認名稱：

dl = DummyLog(log_name="name1")
dl.logger.info("hi")

import time
time.sleep(1)

dl1 = DummyLog(log_name="name2")
dl1.logger.info("hi")

結果將是

logs
├── name1.log
└── name2.log

我發現您的代碼主要有問題，您在默認引數中使用了函式呼叫：

log_name: str = datetime.now().strftime('%d_%m_%Y__%H_%M_%S'),

通過這個lang_name在類定義時用一個字串啟動并且永遠不會改變。你可以使用這樣的解決方案：

import logging
from datetime import datetime
import sys
import os


class DummyLog:
    counter = 0
    def __init__(self,
                 log_name: str = "",
                 logging_level: str = 'debug',
                 string_format: str = '%(asctime)s: %(levelname)s: %(message)s',
                 datetime_format: str = '%m/%d/%Y %I:%M:%S %p',
                 log_on_folder: bool = True,
                 log_folder_name: str = 'logs'
                 ):
        if log_name:
            self.logName = log_name
        else:
            self.logName = f"{DummyLog.counter}_{datetime.now().strftime('%d_%m_%Y__%H_%M_%S')}"
        DummyLog.counter  = 1
        self.logger = None
        self.loggingLevel = logging_level
        self.stringFormat = string_format
        self.datetimeFormat = datetime_format

        if log_on_folder:
            if not os.path.exists(log_folder_name):
                os.mkdir(log_folder_name)
            self.logName = log_folder_name   '/'   self.logName

        self.initiateLogger()

    def initiateLogger(self):
        """ This function will initiate the logger as a single threaded log"""

        self.logger = logging.getLogger(self.logName)
        if self.loggingLevel == 'debug':
            self.loggingLevel = logging.DEBUG
        self.logger.setLevel(self.loggingLevel)
        logFormat = logging.Formatter(self.stringFormat, datefmt=self.datetimeFormat)

        # Creating and adding the console handler
        consoleHandler = logging.StreamHandler(sys.stdout)
        consoleHandler.setFormatter(logFormat)
        self.logger.addHandler(consoleHandler)

        # Creating and adding the file handler
        fileHandler = logging.FileHandler(self.logName   ".log", mode='w')
        fileHandler.setFormatter(logFormat)
        self.logger.addHandler(fileHandler)


dl = DummyLog()
dl.logger.info("hi dl")

dl1 = DummyLog()
dl1.logger.info("hi dl1")

dl2 = DummyLog()
dl2.logger.info("hi dl2")

uj5u.com熱心網友回復：

不要使用可變物件作為默認引數。相反，在運行時傳遞它們或使用 None 作為默認值并設定值。

在您的情況下 DateTime 在函式定義時進行評估。

前任：

def __init__(self,
             log_name = None,
             logging_level: str = 'debug',
             string_format: str = '%(asctime)s: %(levelname)s: %(message)s',
             datetime_format: str = '%m/%d/%Y %I:%M:%S %p',
             log_on_folder: bool = True,
             log_folder_name: str = 'logs'
             ):
    if log_name is None:
      self.logName = datetime.now().strftime('%d_%m_%Y__%H_%M_%S')

dl = DummyLog()
dl.logger.info("hi")

import time
time.sleep(1)

dl1 = DummyLog()
dl1.logger.info("hi")

或在運行時傳遞。

dl = DummyLog(log_name=datetime.now().strftime('%d_%m_%Y__%H_%M_%S'))
dl.logger.info("hi")

import time
time.sleep(1)

dl1 = DummyLog(log_name=datetime.now().strftime('%d_%m_%Y__%H_%M_%S'))
dl1.logger.info("hi")

uj5u.com熱心網友回復：

感謝@S4eed3sm 的回答。我正在更新創建多個.log檔案并用于datetime.now().strftime('%d_%m_%Y__%H_%M_%S')創建日志并帶有前綴的答案

import logging
from datetime import datetime
import sys
import os


class DummyLog:
    def __init__(self,
                 log_name: str = datetime.now().strftime('%d_%m_%Y__%H_%M_%S'),
                 logging_level: str = 'debug',
                 string_format: str = '%(asctime)s: %(levelname)s: %(message)s',
                 datetime_format: str = '%m/%d/%Y %I:%M:%S %p',
                 log_on_folder: bool = True,
                 log_folder_name: str = 'logs',
                 log_prefix: str = None
                 ):
        if log_prefix:
            self.logName = log_prefix   log_name
        else:
            self.logName = log_name
        self.logger = None
        self.loggingLevel = logging_level
        self.stringFormat = string_format
        self.datetimeFormat = datetime_format

        if log_on_folder:
            if not os.path.exists(log_folder_name):
                os.mkdir(log_folder_name)
            self.logName = log_folder_name   '/'   self.logName

        self.initiateLogger()

    def initiateLogger(self):
        """ This function will initiate the logger as a single threaded log"""

        self.logger = logging.getLogger(self.logName)
        if self.loggingLevel == 'debug':
            self.loggingLevel = logging.DEBUG
        self.logger.setLevel(self.loggingLevel)
        logFormat = logging.Formatter(self.stringFormat, datefmt=self.datetimeFormat)

        # Creating and adding the console handler
        consoleHandler = logging.StreamHandler(sys.stdout)
        consoleHandler.setFormatter(logFormat)
        self.logger.addHandler(consoleHandler)

        # Creating and adding the file handler
        fileHandler = logging.FileHandler(self.logName   ".log", mode='w')
        fileHandler.setFormatter(logFormat)
        self.logger.addHandler(fileHandler)


dl = DummyLog(log_prefix='one_')
dl.logger.info("hi")

dl1 = DummyLog(log_prefix='two_')
dl1.logger.info("hi")

這將創建多個.log帶有以下前綴的 s

logs
├── one_03_01_2022__12_42_02.log
└── two_03_01_2022__12_42_02.log

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