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I have a list of values, want to extract the first 3 values every time, and need to remove 1st index position value after iteration.

a = [11,12,13,14,15,16,17,18,19]

Output:

[[11,12,13],[12,13,14],[13,14,15],[14,15,16],[15,16,17],[16,17,18],[17,18,19]]
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A list comprehension is probably fairly straightforward to understand-

a = [11,12,13,14,15,16,17,18,19] a_out = [a[i:i+3] for i in range(len(a)-2)]

Or you can cut and piece together portions of the list with zip too, if this approach makes more sense -

a_out = list(zip(a[0:-2], a[1:-1], a[2:]))
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