Python | Split list in uneven groups

Sometimes, while working with python, we can have a problem of splitting a list. This problem is quite common and has many variations. Having solutions to popular variations proves to be good in long run. Let’s discuss certain way to split list in uneven groups as defined by other list.

Method : Using itertools.islice() + list comprehension
The combination of above functionalities can be used to perform this task. In this, islice() is used to perform the core task of slicing the list and list comprehension is used to perform the task of binding together logic and iterations. The container is converted to iterator for faster iteration.

# Python3 code to demonstrate working of
# Split list in uneven groups
# using itertools.islice() + list comprehension
from itertools import islice

# initialize list
test_list = [1, 4, 5, 7, 6, 5, 4, 2, 10]

# initialize split list
split_list = [3, 4, 2]

# printing original list
print("The original list is : " + str(test_list))

# printing split list
print("The split list is : " + str(split_list))

# Split list in uneven groups
# using itertools.islice() + list comprehension
temp = iter(test_list)
res = [list(islice(temp, 0, ele)) for ele in split_list]

# printing result
print("The resultant split list is : " + str(res))

Output :

The original list is : [1, 4, 5, 7, 6, 5, 4, 2, 10]
The split list is : [3, 4, 2]
The resultant split list is : [[1, 4, 5], [7, 6, 5, 4], [2, 10]]

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