[Tutor] prime numbers

[coskun arslan]

Want to list primes to 20.Where is mistake? 
my_list=[i for i in range(2,21)]for i in my_list:       for k in range(2,i):              if i%k==0:                  my_list.remove(i)print(my_list)
It gives eror List.remove(i) i is not in list.What is wronge?         

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