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Python | Split list into lists by particular value
  • Difficulty Level : Expert
  • Last Updated : 25 Apr, 2019

The splitting of lists is quite common utility nowadays and there can be many applications and use cases of the same. Along with these always come the variations. One such variation can be split the list by particular value. Let’s discuss a certain way in which list split can be performed.

Method : Using list comprehension + zip() + slicing + enumerate()

This problem can be solved in two parts, in first part we get the index list by which split has to be performed using enumerate function. And then we can join the values according to the indices using zip and list slicing.




# Python3 code to demonstrate
# Split list into lists by particular value
# Using list comprehension + zip() + slicing + enumerate()
  
# initializing list
test_list = [1, 4, 5, 6, 4, 5, 6, 5, 4]
  
# printing original list
print("The original list : " + str(test_list))
  
# using list comprehension + zip() + slicing + enumerate()
# Split list into lists by particular value
size = len(test_list)
idx_list = [idx + 1 for idx, val in
            enumerate(test_list) if val == 5]
  
  
res = [test_list[i: j] for i, j in
        zip([0] + idx_list, idx_list + 
        ([size] if idx_list[-1] != size else []))]
  
# print result
print("The list after splitting by a value : " + str(res))


Output :

The original list : [1, 4, 5, 6, 4, 5, 6, 5, 4]
The list after splitting by a value : [[1, 4, 5], [6, 4, 5], [6, 5], [4]]

 

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