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Python – Split a String by Custom Lengths

  • Last Updated : 11 Oct, 2020
Geek Week

Given a String, perform split of strings on the basis of custom lengths.

Input : test_str = ‘geeksforgeeks’, cus_lens = [4, 3, 2, 3, 1] 
Output : [‘geek’, ‘sfo’, ‘rg’, ‘eek’, ‘s’] 
Explanation : Strings separated by custom lengths.
Input : test_str = ‘geeksforgeeks’, cus_lens = [10, 3] 
Output : [‘geeksforge’, ‘eks’] 
Explanation : Strings separated by custom lengths. 
 

Method #1 : Using slicing + loop

In this, we perform task of slicing to cater custom lengths and loop is used to iterate for all the lengths.

Python3




# Python3 code to demonstrate working of 
# Multilength String Split
# Using loop + slicing
  
# initializing string
test_str = 'geeksforgeeks'
  
# printing original string
print("The original string is : " + str(test_str))
  
# initializing length list
cus_lens = [5, 3, 2, 3]
  
res = []
strt = 0
for size in cus_lens:
      
    # slicing for particular length
    res.append(test_str[strt : strt + size])
    strt += size
      
# printing result 
print("Strings after splitting : " + str(res)) 
Output



The original string is : geeksforgeeks
Strings after splitting : ['geeks', 'for', 'ge', 'eks']

Method #2 : Using join() + list comprehension + next()

This is yet another way in which this task can be performed. In this, we perform task of getting character till length using next(),  iterator method, provides more efficient solution. Lastly, join() is used to convert each character list to string.

Python3




# Python3 code to demonstrate working of 
# Multilength String Split
# Using join() + list comprehension + next()
  
# initializing string
test_str = 'geeksforgeeks'
  
# printing original string
print("The original string is : " + str(test_str))
  
# initializing length list
cus_lens = [5, 3, 2, 3]
  
# join() performs characters to string conversion
# list comprehension provides shorthand to solve problem
stritr = iter(test_str)
res = ["".join(next(stritr) for idx in range(size)) for size in cus_lens]
      
# printing result 
print("Strings after splitting : " + str(res)) 
Output
The original string is : geeksforgeeks
Strings after splitting : ['geeks', 'for', 'ge', 'eks']

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