Scrapy linux cron job not work, how I make it work

I tried to automate  a scrapy job using cron on linux. But it did not work. I searched and found the solution.
First use "which scrapy " to find where the scrapy is. For my machine the scrapy is:

/home/ubuntu/anaconda2/bin/scrapy

Then in the  shell script, write:

cd /path/to/spider 

nohup  /home/ubuntu/anaconda2/bin/scrapy crawl quotes   >> log.txt &

It resolved the problem. Or can write:

cd /path/to/spider 

PATH=$PATH:/home/ubuntu/anaconda2/bin

export PATH

nohup  /home/ubuntu/anaconda2/bin/scrapy crawl quotes   >> log.txt &