How to divide python list into sublists of unequal length?

Question

I am trying to divide a list of elements which are comma separated into chunks of unequal length. How can I divide it?

list1 = [1, 2, 1]
list2 = [\"1.1.1.1\", \"         


        

Answer 1

You could combine the power of itertools.accumulate and list comprehensions:

In [4]: from itertools import accumulate

In [5]: data = ["1.1.1.1", "1.1.1.2", "1.1.1.3", "1.1.1.4"]

In [6]: lengths = [1, 2, 1]

In [7]: [data[end - length:end] for length, end in zip(lengths, accumulate(lengths))]
Out[7]: [['1.1.1.1'], ['1.1.1.2', '1.1.1.3'], ['1.1.1.4']]

itertools.accumulate returns an iterator to a sequence of accumulated sums. This way you could easily calculate the end of each chunk in the source array:

In [8]: list(accumulate(lengths))
Out[8]: [1, 3, 4]