Python - Cumulative List Split

Python – Cumulative List Split

Last Updated : 22 Apr, 2020

Sometimes, while working with String lists, we can have a problem in which we need to perform the task of split and return all the split instances of list in cummulative way. This kind of problem can occur in many domains in which data is involved. Lets discuss certain ways in which this task can be performed.

Method #1 : Using loop
This is brute force way in which this task is performed. In this, we test for the list and append the list when ever we encounter the split character.

# Python3 code to demonstrate working of  
# Cummulative List Split 
# Using loop 
  
# initializing list 
test_list = ['gfg-is-all-best'] 
  
# printing original list 
print("The original list is : " + str(test_list)) 
  
# initializing Split char 
spl_char = "-"
  
# Cummulative List Split 
# Using loop 
res = [] 
for sub in test_list: 
    for idx in range(len(sub)): 
        if sub[idx] == spl_char: 
            res.append([ sub[:idx] ]) 
    res.append([ sub ]) 
  
# printing result  
print("The Cummulative List Splits : " + str(res))  

Output :

The original list is : ['gfg-is-all-best']
The Cummulative List Splits : [['gfg'], ['gfg-is'], ['gfg-is-all'], ['gfg-is-all-best']]

Method #2 : Using accumulate() + join()
This is one-liner approach to this problem. In this, we perform the task of cutting into cummulative using accumulate and join() is used to construct the resultant List of lists.

# Python3 code to demonstrate working of  
# Cummulative List Split 
# Using accumulate() + join() 
from itertools import accumulate 
  
# initializing list 
test_list = ['gfg-is-all-best'] 
  
# printing original list 
print("The original list is : " + str(test_list)) 
  
# initializing Split char 
spl_char = "-"
  
# Cummulative List Split 
# Using accumulate() + join() 
temp = test_list[0].split(spl_char) 
res = list(accumulate(temp, lambda x, y: spl_char.join([x, y]))) 
  
# printing result  
print("The Cummulative List Splits : " + str(res))  

Output :

The original list is : ['gfg-is-all-best']
The Cummulative List Splits : ['gfg', 'gfg-is', 'gfg-is-all', 'gfg-is-all-best']

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