l = ['a', 'b', 'c', 'd', 'e', 'f', 'g']
for x in l:
print(S[::2], [1::2])
what does the print statement mean in this program
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John La Rooy
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See https://stackoverflow.com/questions/3453085/what-is-double-colon-in-python-when-subscripting-sequences – Flight Odyssey Aug 09 '17 at 01:37
1 Answers
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A double colon ::x means to skip by x. In this case it is skipping by 2.
So if you have l=[ 'a','b','c','d','e','f','g'] and you want to find l[::2], then starting at 'a', you move to 'c', and so on.
Now, if you have a number before the colons, such as x::y. This means to start at index x and skip by y.