How to store data crawled in scrapy in specfic order?
For this we have to make a list in fields_to_export in the BaseItemExporter class 
field_iter = ['Offer', 'SKU', 'VendorCode'] like this
and then have to pass this list in the field
I have to crawl data from a web page in a specfic order as liked i declared fields in my item class and then have to put them in csv file.problem now occuring is there its stores data not in specfic order as like its scrapping data of any field and putting in csv file but i want it should store data as i declared in my item class. I am newbie in python. can you tell me how to do this 
For ex:
my item class is 
class DmozItem(Item):
    title = Field()
    link = Field()
    desc = Field()
Now when its storing data in csv file its storing first desc ,link and then title 
"desc": [], "link": ["/Computers/Programming/"], "title": ["Programming"]}