a=1964
for yea in range(1964,2018):
  class StackSpider(Spider):
    name = "stack2"
    allowed_domains = ["melon.com","youtube.com"]
    global n
    start_urls = ['https://www.melon.com/chart/age/list.htm?chartType=YE&chartGenre=KPOP&chartDate='+str(i),                                    ]
start_urls is https://www.melon.com/chart/age/list.htm? 
chartType=YE&chartGenre=KPOP&chartDate=2017 Only start
The variable i should also be used in def of the code added below. How is it possible?
 
     
    