在Python中如何从int中减去日期字符串？

Question

我试图在python中减去一个日期字符串，但遇到了这个错误陷阱

if intDay >= 28:
    m0weekbeg = str(wendMonth) + "/16/" + str(wendYear)
    weekBegDay = "16"
    weekEndDay = str(intDay)

dteStartDate = m0weekbeg
mstartdate = m0weekbeg 
mstopdate = m0weekend
cnt= 0
int(cnt)
dteStartDate =datetime.strptime(dteStartDate,'%m/%d/%Y')
startDay = str(dteStartDate.day)
while startDay != 2:
    cnt = cnt+1
    dteStartDate = m0weekbeg-cnt

错误：

  File "C:\Python37-32\pr_import.py", line 242, in proceed
    dteStartDate = m0weekbeg-cnt
TypeError: unsupported operand type(s) for -: 'str' and 'int'

Answer 1

m0weekbeg是一个字符串，不能从str中减去int：

if intDay >= 28:
    m0weekbeg = datetime.date(wendYear, wendMonth, 16)#<<<<<<<<<<<<<<<
    weekBegDay = "16"
    weekEndDay = str(intDay)

dteStartDate = m0weekbeg.strftime('%m/%d/%Y')
mstartdate = m0weekbeg.strftime('%m/%d/%Y')
mstopdate = m0weekend
cnt= 0
int(cnt)
dteStartDate =datetime.strptime(dteStartDate,'%m/%d/%Y')
startDay = str(dteStartDate.day)
while startDay != 2:
    cnt = cnt+1
    dteStartDate = m0weekbeg-datetime.timedelta(days=cnt)#<<<<<<<<<<<<<<

但是这个代码看起来真的很糟糕。我认为重写它会是一个更好的主意，而不是一句一句地翻译它