Владимир Куц

from decimal import Decimal

a = Decimal('100')
b = Decimal('0.00000028')
c = a * b
print(c)

# 0.00002800

class CachedSingletonModel(models.Model):

    class Meta:
        abstract = True

    def save(self, *args, **kwargs):
        self.pk = 1
        super().save(*args, **kwargs)
        self.set_cache()

    def delete(self, *args, **kwargs):
        ''' Bypass delete method '''
        pass

    def set_cache(self):
        cache.set(self.__class__.__name__, self)

    @classmethod
    def load(cls):
        if cache.get(cls.__name__) is None:
            obj, created = cls.objects.get_or_create(pk=1)
            if not created:
                obj.set_cache()
        return cache.get(cls.__name__)


# создаете свою модель настроек
class Settings(CachedSingletonModel):
     ... определяете свои поля
     my_field = ...

# используете
mysettings = Settings.load()
mysettings.my_field

data = .. ваша структура ...
try:
    product_image = next(filter(lambda x: 'ProductImage' in x.keys(), data))
except StopIteration:
    product_image = None

if product_image:
    # работаем дальше с product_image

product_image = list(filter(lambda x: 'ProductImage' in x.keys(), data))

Есть небольшая подсказка, сделать это с помощу eval().

import io
import requests
from lxml import etree

for url in links:
    info = requests.get(url)
    tree = etree.parse(io.StringIO(info.text), etree.HTMLParser())
    rarity = tree.xpath('.//*[@id="largeiteminfo_item_type"]')[0].text
    print(rarity, url)