Python Date and Time Processing, python Date Processing

Python Date and Time Processing, python Date Processing

# Python time operations generally use the time and datetime modules

For the time module, there are three time representation modes.
1. timestamp: time. time ()
2. String: time. strftime ('% Y % m % D ')
3. struct_time format: time. localtime ()

As follows:

1 # time Operation 2 >>> import time 3 >>> time. time () 4 1450336566.81052 5 >>> time. localtime () 6 time. struct_time (tm_year = 2015, tm_mon = 12, tm_mday = 17, tm_hour = 15, tm_min = 16, tm_sec = 14, tm_wday = 3, tm_yday = 351, tm_isdst = 0) 7 >>> time. strftime ('% Y % m % d % H % M % s') 8' 20151217 151632 '9 >>> time. strptime ('2017 20151212 ',' % Y % m % d % H % M % s') 10 time. struct_time (tm_year = 2015, tm_mon = 12, tm_mday = 12, tm_hour = 12, tm_min = 12, tm_sec = 12, tm_wday = 5, tm_yday = 346, tm_isdst =-1) 11 >>> time. mktime (time. localtime () 12 1450336685.013 >>> 14 >>> yesterday = time. strftime ('% Y-% m-% d 00:00:00', time. localtime (time. time ()-3600*24) 15 >>> print yesterday16 >>>> tomorrow = time. strftime ('% Y-% m-% d 00:00:00', time. localtime (time. time () + 3600*24) 18 >>> print tomorrow19 00:00:00

Datetime is useful for time calculation.
There are several useful methods in the datetime module: datetime, date, time, timedelta
Syntax: datetime (year, month, day [, hour [, minute [, second [, microsecond [, tzinfo])
Date (year, month, day) --> date object
Time ([hour [, minute [, second [, microsecond [, tzinfo]) --> a time object
Timedelta (days = 1, hours = 2, minutes = 3, seconds = 4)
Calendar. monthrange (year, month): determines the month composed of year and month. The first day of the month is the day of the week and the total number of days of the month.

 

1 ## obtain date list 2 from datetime import datetime, date, timedelta 3 def get_range_time (begin, end, step): 4 while begin <end: 5 yield begin 6 begin = begin + step 7 8 for I in get_range_time (datetime (, 2), datetime (, 2), timedelta (days = 1 )): 9 print i10 11 from datetime import datetime, date, timedelta12 import calendar13 14 # obtain the dynamic month (the calendar month requires day = 1), as shown in the following 15 def get_month_range (startdate = None ): 16 if startdate is None: 17 startdate = date. today (). replace (day = 1) 18_, days_in_month = calendar. monthrange (startdate. year, startdate. month) 19 enddate = startdate + timedelta (days = days_in_month) 20 return startdate, enddate21 22 begin, end = get_month_range () 23 add_step = timedelta (days = 1) 24 while begin <end: 25 print begin26 begin = begin + add_step