Python time和logging模块

import time
print (time.time())
#1468639205.841486

print (time.ctime())
#Sat Jul 16 11:20:05 2016

print (time.ctime(time.time()-86400))
#Fri Jul 15 11:20:05 2016

print (time.gmtime())
#time.struct_time(tm_year=2016, tm_mon=7, tm_mday=16, tm_hour=3, tm_min=20, tm_sec=5, tm_wday=5, tm_yday=198, tm_isdst=0)

print ("{year}-{month}-{day}".format(year=time.gmtime().tm_year,month=time.gmtime().tm_mon,day=time.gmtime().tm_mday))
#2016-7-16

print ("{0}-{1}-{2}".format(*(time.gmtime().tm_year,time.gmtime().tm_mon,time.gmtime().tm_mday)))
#2016-7-16

print ("{year}-{month}-{day}".format(**{‘year‘:time.gmtime().tm_year,‘month‘:time.gmtime().tm_mon,‘day‘:time.gmtime().tm_mday}))
#2016-7-16

print (time.localtime())
#time.struct_time(tm_year=2016, tm_mon=7, tm_mday=16, tm_hour=11, tm_min=43, tm_sec=1, tm_wday=5, tm_yday=198, tm_isdst=0)

print (time.mktime(time.localtime()))
#1468640581.0


time.sleep(4)
print ("---"*4)

print (time.strftime("%Y-%m-%d %H:%M:%S",time.gmtime()))
#2016-07-16 03:43:01

print (time.strftime("%Y-%m-%d %H:%M:%S",time.localtime()))
#2016-07-16 11:43:01

print (time.strptime("2016-07-16 11:36","%Y-%m-%d %H:%M"))
#time.struct_time(tm_year=2016, tm_mon=7, tm_mday=16, tm_hour=11, tm_min=36, tm_sec=0, tm_wday=5, tm_yday=198, tm_isdst=-1)


#把一个字符串的时间转换为时间戳：首先把字符串转换为struct_time，然后用mktime()来转换
ret = time.strptime("20160716150308","%Y%m%d%H%M%S")
print (ret)
#time.struct_time(tm_year=2016, tm_mon=7, tm_mday=16, tm_hour=15, tm_min=3, tm_sec=8, tm_wday=5, tm_yday=198, tm_isdst=-1)
print (time.mktime(ret))
#1468652588.0

import datetime
print (datetime.date.today())
#2016-07-16

print (datetime.date.fromtimestamp(time.time()))
#2016-07-16

print (datetime.datetime.now())
#2016-07-16 11:54:20.143985

print (datetime.datetime.now().timetuple())
#time.struct_time(tm_year=2016, tm_mon=7, tm_mday=16, tm_hour=11, tm_min=54, tm_sec=20, tm_wday=5, tm_yday=198, tm_isdst=-1)

#time经常用于取时间戳
#datetime经常用于取时间

new_date1 = datetime.datetime.now() + datetime.timedelta(days=10)
print (new_date1)
#2016-07-26 12:07:53.078482

new_date2 = datetime.datetime.now() + datetime.timedelta(hours=10)
print (new_date2)
#2016-07-16 22:07:53.078482

import logging  
logging.debug(‘debug message‘)  
logging.info(‘info message‘)  
logging.warning(‘warning message‘)  
logging.error(‘error message‘)  
logging.critical(‘critical message‘)  

输出：

　　WARNING:root:warning message
　　ERROR:root:error message
　　CRITICAL:root:critical message

　Python默认的将WARN级别以上的信息打印到标准输出

import logging
import logging
logging.basicConfig(level=logging.DEBUG,
                    format=‘%(asctime)s %(filename)s[line:%(lineno)d] %(levelname)s %(message)s‘,
                    datefmt=‘%a, %d %b %Y %H:%M:%S‘,
                    filename=‘log_module.log‘,
                    filemode=‘w‘)

logging.debug(‘debug message‘)  
logging.info(‘info message‘)
logging.warning(‘warning message‘)
logging.error(‘error message‘)
logging.critical(‘critical message‘)