list1 = []

for i in range(1,10,2):

    list1.append("data{}".format(i))

print(list1)

list2 = [ "data{}".format(i)for i in range(1,10,2)]

print(list2)

list3= []

for i in range(10):

    if i %2 == 1:

        list3.append("data{}".format(i))

print(list3)

list4 = [ "data{}".format(i) for i in range(0,10) if i % 2 == 0]

print(list4)