How to use Python to determine and count the number of days in each month . In daily study or work, we often encounter situations where we need to count date data. In particular, statistics involve the calculation of natural weeks or natural months.
Using the Python programming language to count these requires considering many conditions. For example: when running automatically, we need to determine the number of days in each month, and for the addition and subtraction of natural months, we also need to consider the natural months across the year and whether it is a leap year.
This is a small program written in python that can calculate natural weeks and natural months. It is calculated by timestamp and returns the timestamp;
if the day is calculated, the timestamp of the early morning of the current day is returned;
if the week is calculated, the timestamp of the early morning of Monday of the current week is returned; for
natural months, the timestamp of the early morning of the 1st of the current month is returned.
The code doesn't look very good, but the effect is still good.
Python judgment statistics source code example of the number of days in each month: as follows
#!/usr/bin/python
# -*- coding: utf-8 -*-
"""
计算自然周第一天、自然月第一天和每天的凌晨时间戳
//www.iplaypy.com/
"""
import time
def get_day_begin(ts = time.time(),N = 0):
"""
N为0时获取时间戳ts当天的起始时间戳，N为负数时前数N天，N为正数是后数N天
"""
return int(time.mktime(time.strptime(time.strftime('%Y-%m-%d',time.localtime(ts)),'%Y-%m-%d'))) + 86400*N
def get_week_begin(ts = time.time(),N = 0):
"""
N为0时获取时间戳ts当周的开始时间戳，N为负数时前数N周，N为整数是后数N周，此函数将周一作为周的第一天
"""
w = int(time.strftime('%w',time.localtime(ts)))
return get_day_begin(int(ts - (w-1)*86400)) + N*604800
def get_month_begin(ts = time.time(),N = 0):
"""
N为0时获取时间戳ts当月的开始时间戳，N为负数前数N月，N为正数后数N月
"""
month_day = {1:31,3:31,4:30,5:31,6:30,7:31,8:31,9:30,10:31,11:30,12:31}
cur_y,cur_m,cur_d = [int(x) for x in time.strftime('%Y-%m-%d',time.localtime(ts)).split('-')]
if (cur_y%4 == 0 and cur_y%100 != 0) or cur_y%400 == 0:
month_day[2] = 29
else:
month_day[2] = 28
t = get_day_begin(ts) - (cur_d-1)*86400
real_month = N + cur_m
if real_month == cur_m:
return t
if N > 0:
if real_month <= 12:
for x in xrange(cur_m,real_month):
t += month_day[x]*86400
if real_month > 12:
for x in xrange(cur_m,13):
t += month_day[x]*86400
t = get_month_begin(t,real_month - 13)
if N < 0:
if real_month >= 1:
for x in xrange(real_month,cur_m):
t -= month_day[x]*86400
if real_month < 1:
for x in xrange(1,cur_m):
t -= month_day[x]*86400
t -= month_day[12]*86400
t = get_month_begin(t,real_month)
return t
if __name__ == "__main__":
t = time.time()
print time.strftime('%Y-%m-%d %H:%M:%S',time.localtime(get_day_begin(t,1)))
print time.strftime('%Y-%m-%d %H:%M:%S',time.localtime(get_week_begin(t,-2)))
print time.strftime('%Y-%m-%d %H:%M:%S',time.localtime(get_month_begin(t,-3)))