python寫入日誌檔案時日誌內容重複寫入

python寫入日誌檔案時日誌內容重複寫入：原因handler未移除，導致重複寫入

問了度娘之後，大概搞明白了，就是你第二次呼叫log的時候，根據getlogger(name)裡的name獲取同乙個logger，而這個logger裡已經有了第一次你新增的handler，第二次呼叫又新增了乙個handler，所以，這個logger裡有了兩個同樣的handler，以此類推，呼叫幾次就會有幾個handler。。

修改前**：

1

#coding:utf-8
2import
logging
3from logging import
handlers45
6class
logger():
7     level_relations = 
9     fmt_str = "
%(asctime)s - %(pathname)s[line:%(lineno)d] - %(levelname)s:%(message)s"10
def__init__(self, filename, level="
info
", when="
d", backcount=2, fmt=fmt_str):
11         self.logger =logging.getlogger(filename)
12         format_str =logging.formatter(fmt)
13self.logger.setlevel(self.level_relations.get(level))
14         self.th = handlers.timedrotatingfilehandler(filename, when=when, backupcount=backcount, encoding="
utf-8")
15self.th.setformatter(format_str)
1617
def log_write(self, log_text, level="
info"):
18self.logger.addhandler(self.th)
19if level == "
debug
"or level == "
debug":
20self.logger.debug(log_text)
21elif level == "
info
"or level == "
info":
22self.logger.info(log_text)
23elif level == "
warning
"or level == "
warning":
24self.logger.warning(log_text)
25elif level == "
error
"or level == "
error":
26self.logger.error(log_text)
27elif level == "
critical
"or level == "
critical":
28self.logger.critical(log_text)
29else:30
raise ("
日誌級別錯誤")
3132
33if
__name__ == '
__main__':
34     log1 = logger("
text.log")
35     log1.log_write("
test4-0")
36     log2 = logger("
text.log")
37     log2.log_write("
test4-1")
38     log3 = logger("
text.log")
39     log3.log_write("
test4-2
")

檔案中日誌內容列印了多次

修改後的**：

1

#coding:utf-8
2import
logging
3from logging import
handlers45
6class
logger():
7     level_relations = 
9     fmt_str = "
%(asctime)s - %(pathname)s[line:%(lineno)d] - %(levelname)s:%(message)s"10
def__init__(self, filename, log_text, level="
info
", when="
d", backcount=2, fmt=fmt_str):
11         self.logger =logging.getlogger(filename)
12         format_str =logging.formatter(fmt)
13self.logger.setlevel(self.level_relations.get(level))
14         self.th = handlers.timedrotatingfilehandler(filename, when=when, backupcount=backcount, encoding="
utf-8")
15self.th.setformatter(format_str)
1617
def log_write(self, log_text, level="
info"):
18self.logger.addhandler(self.th)
19if level == "
debug
"or level == "
debug":
20self.logger.debug(log_text)
21elif level == "
info
"or level == "
info":
22self.logger.info(log_text)
23elif level == "
warning
"or level == "
warning":
24self.logger.warning(log_text)
25elif level == "
error
"or level == "
error":
26self.logger.error(log_text)
27elif level == "
critical
"or level == "
critical":
28self.logger.critical(log_text)
29else:30
raise ("
日誌級別錯誤")
31         self.logger.removehandler(self.th)  #
日誌寫入完成後移除handler
3233
34if
__name__ == '
__main__':
35     log = logger("
text.log
", "
test4-1")
36     log = logger("
text.log
", "
test4-2")
37     log = logger("
text.log
", "
test4-3
")

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