異常是：不支持的操作數類型爲 - ：'str'和'datetime.timedelta'

我是新的蟒蛇，我正在制定一個系統，處理request.GET方法... 當我通過日期到系統中，如果存在，那麼它會根據該日期和其他日期查找數據庫並顯示數據，否則會顯示在這裏與其他日期的日期...... 是我的代碼：異常是：不支持的操作數類型爲 - ：'str'和'datetime.timedelta'

from django.utils.xmlutils import SimplerXMLGenerator 
from piston.handler import BaseHandler 
from booking.models import * 
from django.db.models import * 
from piston.utils import rc, require_mime, require_extended, validate 
import datetime 

class BookingHandler(BaseHandler): 
    allowed_method = ('GET', 'POST', 'PUT', 'DELETE') 
    fields = ('id', 'date_select', 'product_name', 'quantity', 'price','totalcost', 'first_name', 'last_name', 'contact', 'product') 
    model = Booking 
    #for product availability 
    def read(self, request, id, date_select): 
     if not self.has_model(): 
      return rc.NOT_IMPLEMENTED 
     try: 
      prod = Product.objects.get(id=id) 
      merge = [] 
      checkDateExist = Booking.objects.filter(date_select=date_select) 
      if checkDateExist.exists(): 
       entered_date = Booking.objects.values('date_select').distinct('date_select').filter(date_select=date_select)[0]['date_select'] 
      else:    
       enteredTemp_date = datetime.datetime.strptime(date_select, '%Y-%m-%d') 
       entered_date = datetime.datetime.strftime(enteredTemp_date,'%Y-%m-%d') 


      delta = datetime.timedelta(days=3) 
      target_date = entered_date - delta 
      day = 1 
      for x in range(0,5): 
       delta = datetime.timedelta(days=x+day) 
       new_date = target_date + delta 
       maximumProdQuantity = prod.quantity 
       quantityReserve = Booking.objects.filter(date_select=new_date, product=prod).aggregate(Sum('quantity'))['quantity__sum'] 
       if quantityReserve == None: 
        quantityReserve = 0 

       data1 = {'maximum_guest': maximumProdQuantity, 'avialable': quantityReserve, 'date': new_date} 
       merge.append(data1)  

      return merge  
     except self.model.DoesNotExist: 
      return rc.NOT_HERE

，我得到這個錯誤：

Piston/0.3dev (Django 1.3.1) crash report: 

Method signature does not match. 

Signature should be: id, date_select 

Exception was: unsupported operand type(s) for -: 'str' and 'datetime.timedelta'

我想在我else聲明entered_date成爲一個字符串，我做這一行entered_date = datetime.datetime.strftime(enteredTemp_date,'%Y-%m-%d')，這樣的日期格式將不是2011-12-01 00:00:00我只需要2011-12-01。我的問題是我怎麼能得到2011-12-01是日期時間格式不是字符串？任何人都可以提供一個關於我的情況的提示或想法？謝謝

來源

2011-12-03 gadss

strftime返回格式化的字符串。如果您想丟棄datetime對象的時間部分，請使用datetime.date：

entered_date = datetime.datetime.strptime(date_select, '%Y-%m-%d') 
entered_date = entered_date.date()

來源

2011-12-03 06:42:32

異常是：不支持的操作數類型爲 - ：'str'和'datetime.timedelta'

回答

相關問題