definition:
Python code module is a collection of a group, other modules, may also be used with other modules.
Key:
1, the module name and not the name of the module that comes with the same, or will his priority call that module, since (except time, sys module) is to find the time to find the module in accordance with the path sys.path (), you can use the import under the name of the module to test whether there is a conflict
2, the main program added if __name __ = '__ main__' contents can be prevented others implement their own modules in the module to call their own when non-modular section
3, using tissue package module can be prevented from conflicting modules
Built-in Module time:
from time import time
time () Gets the timestamp
localtime () to get local time (East eight districts, eight hours behind Greenwich Mean Time) (default to convert a timestamp into struct_tiem)
例如：time.struct_time(tm_year=2020, tm_mon=4, tm_mday=10, tm_hour=1, tm_min=16, tm_sec=23, tm_wday=4, tm_yday=101, tm_isdst=0)
gmtime, () Gets UTC time (default timestamp converted struct_tiem)
例如：time.struct_time(tm_year=2020, tm_mon=4, tm_mday=9, tm_hour=17, tm_min=16, tm_sec=51, tm_wday=3, tm_yday=100, tm_isdst=0)
gmtime (). tm_hour Gets a value struct_time in time, localtime () also applies
Timeshift:
time.mktime (time.gmtime ()) to convert the format into a timestamp struct_time
time.stiftime () converts into formatted strc_time time, for example: print (time.strftime ( '% Y-% m-% d% H:% M:% S', time.gmtime ()))
the time.strptime () is converted into the time format strac_time example: print (time.strptime ( '2020-04-09 16:53:03', '% Y-% m-% d% H:% M:% S '))
that time.asctime () Default struct_time converted into a format Fri Apr 10 00:47:11 2020
time.ctime () The default timestamp converted format Fri Apr 10 00:47:11 2020
Key Time Module datetime:
import datetime
print (datetime.datetime.now ()) the most humane of the most common time format, 2020-04-1000: 58: 04.055228
random module:
from random imprt *
random () Default random floating point number between 0-1
Integer between randint (1,3) random 1-3, comprising 3
Integer between randrange (1,3) random 1-3, excluding 3
([2,3]) a random element in the choice list
sample ([1.2.3.4.5], 2) a random list of two random numbers
Floating between uniform (1,3) random 1-3
Operations: Generate a random digit codes