Python – Split Strings on Prefix Occurrence
Given a list of Strings, perform string split on the occurrence of prefix.
Input : test_list = [“geeksforgeeks”, “best”, “geeks”, “and”], pref = “geek”
Output : [[‘geeksforgeeks’, ‘best’], [‘geeks’, ‘and’]]
Explanation : At occurrence of string “geeks” split is performed.Input : test_list = [“good”, “fruits”, “goodness”, “spreading”], pref = “good”
Output : [[‘good’, ‘fruits’], [‘goodness’, ‘spreading’]]
Explanation : At occurrence of string “good” split is performed.
Method #1 : Using loop + startswith()
In this, we iterate each element of List, and check if new list has to be changed using startswith() by checking for prefix, and create new list if prefix is encountered.
Python3
# Python3 code to demonstrate working of# Split Strings on Prefix Occurrence# Using loop + startswith()# initializing listtest_list = ["geeksforgeeks", "best", "geeks", "and", "geeks", "love", "CS"]# printing original listprint("The original list is : " + str(test_list))# initializing prefixpref = "geek"res = []for val in test_list: # checking for prefix if val.startswith(pref): # if pref found, start new list res.append([val]) else: # else append in current list res[-1].append(val)# printing resultprint("Prefix Split List : " + str(res)) |
The original list is : ['geeksforgeeks', 'best', 'geeks', 'and', 'geeks', 'love', 'CS'] Prefix Split List : [['geeksforgeeks', 'best'], ['geeks', 'and'], ['geeks', 'love', 'CS']]
Method #2 : Using loop + zip_longest() + startswith()
In this, we zip all the elements with their subsequent element sublist and check for prefix using startswith(), if found, result is appended.
Python3
# Python3 code to demonstrate working of# Split Strings on Prefix Occurrence# Using loop + zip_longest() + startswith()from itertools import zip_longest# initializing listtest_list = ["geeksforgeeks", "best", "geeks", "and", "geeks", "love", "CS"]# printing original listprint("The original list is : " + str(test_list))# initializing prefixpref = "geek"res, temp = [], []for x, y in zip_longest(test_list, test_list[1:]): temp.append(x) # if prefix is found, split and start new list if y and y.startswith(pref): res.append(temp) temp = []res.append(temp)# printing resultprint("Prefix Split List : " + str(res)) |
The original list is : ['geeksforgeeks', 'best', 'geeks', 'and', 'geeks', 'love', 'CS'] Prefix Split List : [['geeksforgeeks', 'best'], ['geeks', 'and'], ['geeks', 'love', 'CS']]
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