我們正在嘗試在python中創建日歷函數.我們創建了一個小型的內容管理系統,要求是,網站的右上角會有一個下拉列表,它會給出選項 – 月 – 1個月,2個月,3個月等等. ..,如果用戶選擇8個月,那么它應該顯示過去8個月的postscount.問題是我們試圖編寫一個可以進行月計算的小代碼,但問題是它沒有考慮當年之后的幾個月,它只顯示當年的幾個月的postscount.

例如：如果用戶選擇3個月,它將顯示l 3個月(即當前月份和前2個月)的計數,但如果用戶選擇超過4個月的選項,則不會考慮上一年的月份,它仍然只顯示今年的月份.

我粘貼下面的代碼： –

def __getSpecifiedMailCount__(request, value):

dbconnector= DBConnector()

CdateList= "select cdate from mail_records"

DateNow= datetime.datetime.today()

DateNow= DateNow.strftime("%Y-%m")

DateYear= datetime.datetime.today()

DateYear= DateYear.strftime("%Y")

DateMonth= datetime.datetime.today()

DateMonth= DateMonth.strftime("%m")

#print DateMonth

def getMonth(value):

valueDic= {"01": "Jan", "02": "Feb", "03": "Mar", "04": "Apr", "05": "May", "06": "Jun", "07": "Jul", "08": "Aug", "09": "Sep", "10": "Oct", "11": "Nov", "12": "Dec"}

return valueDic[value]

def getMonthYearandCount(yearmonth):

MailCount= "select count(*) as mailcount from mail_records where cdate like '%s%s'" % (yearmonth, "%")

MailCountResult= MailCount[0]['mailcount']

return MailCountResult

MailCountList= []

MCOUNT= getMonthYearandCount(DateNow)

MONTH= getMonth(DateMonth)

MailCountDict= {}

MailCountDict['monthyear']= MONTH + ' ' + DateYear

MailCountDict['mailcount']= MCOUNT

var_monthyear= MONTH + ' ' + DateYear

var_mailcount= MCOUNT

MailCountList.append(MailCountDict)

i=1

k= int(value)

hereMONTH= int(DateMonth)

while (i < k):

hereMONTH= int(hereMONTH) - 1

if (hereMONTH < 10):

hereMONTH = '0' + str(hereMONTH)

if (hereMONTH == '00') or (hereMONTH == '0-1'):

break

else:

PMONTH= getMonth(hereMONTH)

hereDateNow= DateYear + '-' + PMONTH

hereDateNowNum= DateYear + '-' + hereMONTH

PMCOUNT= getMonthYearandCount(hereDateNowNum)

MailCountDict= {}

MailCountDict['monthyear']= PMONTH + ' ' + DateYear

MailCountDict['mailcount']= PMCOUNT

var_monthyear= PMONTH + ' ' + DateYear

var_mailcount= PMCOUNT

MailCountList.append(MailCountDict)

i = i + 1

#print MailCountList

MailCountDict= {'monthmailcount': MailCountList}

reportdata = MailCountDict['monthmailcount']

#print reportdata

return render_to_response('test.html', locals())

解決方法:

您可以在datetime模塊中使用timedelta來減去月份.

from datetime import datetime, timedelta

now = datetime.now()

four_months_ago = now - timedelta(days=(4*365)/12)

這將跟蹤在必要時搬回一年……

>>> january_first = datetime(2009, 1,1)

>>> january_first - timedelta(days=(4*365)/12)

datetime.datetime(2008, 9, 2, 0, 0)

標簽：python,calendar

來源： https://codeday.me/bug/20190607/1191078.html

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