def index(request): if Team.objects.count() == 0: init() data_list = Team.objects.all() # teamname = request.GET.get('teamname') print(teamname) if teamname: data_list = data_list.filter(teamname__icontains=teamname) else: teamname = '' data_list = data_list.order_by("-winrate") return render(request, 'index.html', locals())
时间: 2023-05-31 20:02:32 浏览: 53
这段代码的作用是:定义一个名为“index”的函数,该函数接收一个名为“request”的参数。如果数据库中的Team对象数量为0,则调用init()函数进行初始化。然后将所有Team对象查询出来,并赋值给名为“data_list”的变量。
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解释一下这段代码def price(request): if request.method == "GET": contact_list = models.zufang.objects.values_list().order_by('id') contact_list = [i for i in contact_list] new_contact_list = random.sample(contact_list, 3) user_name = models.Collection.objects.get(name=request.session.get('user_name')) if user_name.count > 0: collection = user_name.collection collection = collection.split(",") collection = [int(i) for i in collection] find_index = [] for item in collection: find_index.append(models.zufang.objects.values_list().filter(id=item)[0]) find_index = [i for i in find_index] else: collection = [] find_index = [] if request.GET.get("update_item") == "ok": return JsonResponse({"new_contact_list": new_contact_list, "find_index": find_index}, safe=False) return render(request, 'price.html', locals()) else: user_name = models.Collection.objects.get(name=request.session.get('user_name')) count = user_name.count if user_name.count > 0: collection = user_name.collection collection = collection.split(",") else: collection = [] if request.POST.get("new") == "true": count += 1 new_collection = request.POST.get("data_id") collection.append(new_collection) collection = ','.join(collection) new = models.Collection.objects.get(name=request.session.get('user_name')) new.collection = collection new.count = count new.save() else: count -= 1 new_collection = request.POST.get("data_id") collection.remove(new_collection) collection = ','.join(collection) new = models.Collection.objects.get(name=request.session.get('user_name')) new.collection = collection new.count = count new.save() return JsonResponse({}, safe=False)
这段代码是一个 Django 后端函数,名为 price,它处理 GET 和 POST 请求。对于 GET 请求,它从数据库中获取租房信息,并随机选取3个展示,并根据用户是否登录和是否已经收藏,返回对应的信息。对于 POST 请求,它根据用户的行为,将租房信息添加到或删除到用户的收藏列表中,并返回一个空的 JSON 响应。
编写函数并调用class ShoppingCart: def __init__(self): self.items = {} def add_item(self, item, quantity): if item in self.items: self.items[item] += quantity else: self.items[item] = quantity def remove_item(self, item, quantity): if item in self.items: if self.items[item] <= quantity: del self.items[item] else: self.items[item] -= quantity def get_total(self): total = 0 for item, quantity in self.items.items(): total += item.get_price() * quantity return total def get_item_count(self): count = 0 for quantity in self.items.values(): count += quantity return count def get_items(self): return self.items
好的,以下是你需要的代码:
class ShoppingCart:
def __init__(self):
self.items = {}
def add_item(self, item, quantity):
if item in self.items:
self.items[item] += quantity
else:
self.items[item] = quantity
def remove_item(self, item, quantity):
if item in self.items:
if self.items[item] <= quantity:
del self.items[item]
else:
self.items[item] -= quantity
def get_total(self):
total = 0
for item, quantity in self.items.items():
total += item.get_price() * quantity
return total
def get_item_count(self):
count = 0
for quantity in self.items.values():
count += quantity
return count
def get_items(self):
return self.items
你可以通过以下方式调用它:
cart = ShoppingCart()
cart.add_item(item1, 2)
cart.add_item(item2, 1)
cart.remove_item(item1, 1)
total = cart.get_total()
count = cart.get_item_count()
items = cart.get_items()
请注意,item1和item2是你自己定义的商品对象,get_price()是商品对象的一个方法,用于获取商品价格。