Python if statement always running

I'm having a problem creating a script that writes a line to a new file while skipping every 5th line. For some reason my code will still write every line, even though the "Skipping" and "Writing" print statements are printed correctly.

    i = 0
# loop through array and write to csv
for each in containers:
    if i == 5:
        i = 0
        print("skipping")
    else:
        f.write(each.a['href'] + "\n")
        i = i +1
        print("writing")

Any help would be appreciated!