----------------------------接 python内置模块(三)---------------------------
十一、hashlib模块
用于加密相关的操作,3.x里代替了md5模块和sha模块,主要提供 SHA1, SHA224, SHA256, SHA384, SHA512 ,MD5 算法
import hashlib
m = hashlib.md5()
m.update(b"Hello")
m.update(b"It‘s me")
print(m.digest())
m.update(b"It‘s been a long time since last time we ...")
print(m.digest()) #2进制格式hash
print(len(m.hexdigest())) #16进制格式hash
# ######## md5 ########
hash = hashlib.md5()
hash.update(b‘admin‘)
print(hash.hexdigest())
# ######## sha1 ########
hash = hashlib.sha1()
hash.update(b‘admin‘)
print(hash.hexdigest())
# ######## sha256 ########
hash = hashlib.sha256()
hash.update(b‘admin‘)
print(hash.hexdigest())
# ######## sha384 ########
hash = hashlib.sha384()
hash.update(b‘admin‘)
print(hash.hexdigest())
# ######## sha512 ########
hash = hashlib.sha512()
hash.update(b‘admin‘)
print(hash.hexdigest())
另外python 还有一个 hmac 模块,它内部对我们创建 key 和 内容 再进行处理然后再加密
import hmac
h = hmac.new(b‘shuoming‘)
h.update(b‘test‘)
print(h.hexdigest())
十二、logging模块
很多程序都有记录日志的需求,并且日志中包含的信息即有正常的程序访问日志,还可能有错误、警告等信息输出,python的logging模块提供了标准的日志接口,你可以通过它存储各种格式的日志,logging的日志可以分为 debug()
, info()
, warning()
, error()
and critical() 5个级别:
Level | When it’s used |
DEBUG | Detailed information, typically of interest only when diagnosing problems. |
INFO | Confirmation that things are working as expected. |
WARNING | An indication that something unexpected happened, or indicative of some problem in the near future (e.g. ‘disk space low’). The software is still working as expected. |
ERROR | Due to a more serious problem, the software has not been able to perform some function. |
CRITICAL | A serious error, indicating that the program itself may be unable to continue running. |
1.将日志信息输出到屏幕终端
import logging
logging.warning("user [alex] attempted wrong password more than 3 times")
logging.critical("server is down")
2.将日志信息输出到文件中
import logging
logging.basicConfig(filename=‘example.log‘,level=logging.INFO)
logging.debug(‘This message should go to the log file‘)
logging.info(‘So should this‘)
logging.warning(‘And this, too‘)
其中下面这句中的level=loggin.INFO意思是,把日志纪录级别设置为INFO,也就是说,只有比日志是INFO或比INFO级别更高的日志才会被纪录到文件里,在这个例子, 第一条日志是不会被纪录的,如果希望纪录debug的日志,那把日志级别改成DEBUG就行了。
另外还可以加上时间和日期等:
logging.basicConfig
(filename
=
‘log.log‘
,
format
=
‘%(asctime)s - %(name)s - %(levelname)s -%(module)s: %(message)s‘
,
datefmt
=
‘%Y-%m-%d %H:%M:%S %p‘
,
level
=
10
)
3.将日志信息同时输出到文件和终端
import logging
#create logger(全局日志级别信息,优先级最高)
logger = logging.getLogger(‘TEST-LOG‘)
logger.setLevel(logging.DEBUG)
# create console handler and set level to debug(创建输出终端信息及日志级别)
ch = logging.StreamHandler()
ch.setLevel(logging.DEBUG)
# create file handler and set level to warning(创建输出到日志文件信息及日志级别)
fh = logging.FileHandler("access.log")
fh.setLevel(logging.WARNING)
# create formatter (创建日志格式)
formatter = logging.Formatter(‘%(asctime)s - %(name)s - %(levelname)s - %(message)s‘)
# add formatter to ch and fh(定选日志输出格式)
ch.setFormatter(formatter)
fh.setFormatter(formatter)
# add ch and fh to logger(添加输出方式)
logger.addHandler(ch)
logger.addHandler(fh)
# ‘application‘ code(日志信息)
logger.debug(‘debug message‘)
logger.info(‘info message‘)
logger.warn(‘warn message‘)
logger.error(‘error message‘)
logger.critical(‘critical message‘)
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原文地址:http://51enjoy.blog.51cto.com/8393791/1744288