1.datetime module
1) datetime.datetime.now (), returns the respective current time, date type.
datetime.datetime.now (), returns the current date.
. 1 Import datetime 2 dt = datetime.datetime.now () . 3 Print (dt) . 4 Results: . 5 2019 - 12 is - 16 . 11 : 23 is : 58.066730
datetime.datetime.now (). year, returns the current year, month, day.
1 import datetime 2 dt = datetime.datetime.now() 3 print(dt.year) 4 print(dt.month) 5 print(dt.day) 6 结果： 7 2019 8 12 9 16
datetime.datetime.now (). replace (), the replacement time, replace the specified date.
1 import datetime 2 dt = datetime.datetime.now() 3 print(dt) 4 print(dt.replace(year=2020,month=1,day=1)) 5 结果： 6 2019-12-16 11:54:29.262599 7 2020-01-01 11:54:29.262599
datetime.datetime.now (). time (), returns the current time, time tuple (struct_time), timestamp.
1 import datetime 2 dt = datetime.datetime.now() 3 print(dt.time()) 4 print(dt.timetuple()) 5 print(dt.timestamp()) 6 结果： 7 11:27:55.867669 8 time.struct_time(tm_year=2019, tm_mon=12, tm_mday=16, tm_hour=11, tm_min=27, tm_sec=55, tm_wday=0, tm_yday=350, tm_isdst=-1) 9 1576466875.867669
2)datetime.date.fromtimestamp()
The timestamp into a datetime date type.
1 import datetime 2 import time 3 dt = time.time() 4 print(datetime.date.fromtimestamp(dt)) 5 结果： 6 2019-12-16
3) datetime.timedelta ()
datetime.datetime.now () + datetime.timedelta (n), n represents the applied current datetime days time.
1 import datetime 2 dt = datetime.datetime.now () 3 print (dt) 4 print (dt + datetime.timedelta ( 2 )) 5 结果: 6 2019 - 12 - 16 11 : 47 : 45.999598 7 2019 - 12 - 18 11 : 47 : 45.999598
datetime.timedelta (hours = n), represents the increase in the current time n datetime hours.
1 import datetime 2 dt = datetime.datetime.now() 3 print(dt) 4 print(dt + datetime.timedelta(hours=2)) 5 结果： 6 2019-12-16 11:50:27.621787 7 2019-12-16 13:50:27.621787
2.sys module
sys module provides a series of python runtime environment variables and functions.
1)sys.argv
The list of parameters of command line parameters is currently being executed.
. 1 Import SYS 2 Print (the sys.argv) . 3 Results: . 4 [ ' F.: / Python / week2 / module .py ' ]
2)sys.platform
Gets the current execution environment platform, win32 represent windows 32bit operating system, linux2 expressed linux platform.
. 1 Import SYS 2 Print (sys.platform) . 3 Results: . 4 Win32
3)sys.path
path is a directory listing, look for third-party extensions from python module; sometimes in order to allow python to find their own definition module, you need to modify the list sys.path, () the name of the custom plug-in module that is used sys.path.insert can.
1 import sys 2 print(sys.path) 3 结果： 4 ['F:\\python\\week2', 'F:\\python', 'F:\\python\\python3.5.2\\python35.zip', 'F:\\python\\python3.5.2\\DLLs', 'F:\\python\\python3.5.2\\lib', 'F:\\python\\python3.5.2', 'F:\\python\\python3.5.2\\lib\\site-packages']
4)sys.builtin_module_names
Returns a list that contains the name of the built-in module.
1 import sys 2 print(sys.builtin_module_names) 3 结果： 4 ('_ast', '_bisect', '_codecs', '_codecs_cn', '_codecs_hk', '_codecs_iso2022', '_codecs_jp', '_codecs_kr', '_codecs_tw', '_collections', '_csv', '_datetime', '_functools', '_heapq', '_imp', '_io', '_json', '_locale', '_lsprof', '_md5', '_multibytecodec', '_opcode', '_operator', '_pickle', '_random', '_sha1', '_sha256', '_sha512', '_signal', '_sre', '_stat', '_string', '_struct', '_symtable', '_thread', '_tracemalloc', '_warnings', '_weakref', '_winapi', 'array', 'atexit', 'audioop', 'binascii', 'builtins', 'cmath', 'errno', 'faulthandler', 'gc', 'itertools', 'marshal', 'math', 'mmap', 'msvcrt', 'nt', 'parser', 'sys', 'time', 'winreg', 'xxsubtype', 'zipimport', 'zlib')
5)sys.exit()
Call sys.exit () you can drop out program.