python built-in modules

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time module

Timestamp time.time()# prints out the number of seconds, starting from 1970

time.localtime()# displays structured time, local time

time. gmtime()# also displays structured time, but it is world standard time

Convert structured time into timestamp, time.mktime(time.localtime())

Convert structured time Convert time into string time, time.strftime("%Y-%m-%d %X", time.localtime())

Convert string time into structured time, time.strptime( "2018:04:03:15:00:00","%Y:%m:%d:%X")

Intuitive display of time: time.asctime();time.ctime()

The now method in datetime in the datetime module can also display the current time

>>> import time
>>> time.time()
1522738511.5656116
>>> t = time.localtime()#显示结构化时间，可以取出
>>> t
time.struct_time(tm_year=2018, tm_mon=4, tm_mday=3, tm_hour=14, tm_min=55, tm_sec=58, tm_wday=1, tm_yday=93, tm_isdst=0)
>>> t.tm_year
2018
>>> t.tm_yday
93
>>> t1 = time.gmtime()
>>> t1
time.struct_time(tm_year=2018, tm_mon=4, tm_mday=3, tm_hour=7, tm_min=1, tm_sec=3, tm_wday=1, tm_yday=93, tm_isdst=0)
>>> #将结构化时间转换成时间戳
>>> t2 = time.mktime(time.localtime())
>>> t2
1522740660.0
>>> t3 = time.strftime("%Y-%m-%d %X",time.localtime())
>>> t3
'2018-04-03 15:35:24'
>>> t4 = time.strptime("2018:04:03:15:00:00","%Y:%m:%d:%X")
>>> t4
time.struct_time(tm_year=2018, tm_mon=4, tm_mday=3, tm_hour=15, tm_min=0, tm_sec=0, tm_wday=1, tm_yday=93, tm_isdst=-1)
>>> t5 = time.asctime()
>>> t5
'Tue Apr  3 15:43:20 2018'
>>> t6 = time.ctime()
>>> t6
'Tue Apr  3 15:43:35 2018'
>>> import datetime
>>> t7 = datetime.datetime.now()
>>> t7
datetime.datetime(2018, 4, 3, 15, 45, 39, 99611)
>>>

random module

##os module

sys module

json module

re module

ret = re.findall('xiaom','xaiosmmkxiaomdshaid')print(ret)#元字符:^ $ * + ? {} [] \ ( ) \

#Regular expression, see novice tutorial

xml module

has similar functions to the json module, used for data exchange, xml passes Nodes to distinguish data structures

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