Python - Merge list elements Last Updated : 10 Dec, 2024 Summarize Suggest changes Share Like Article Like Report Merging list elements is a common task in Python. Each method has its own strengths and the choice of method depends on the complexity of the task. This is the simplest and most straightforward method to merge elements. We can slice the list and use string concatenation to combine elements. Python a = list('geeksforgeeks') # Merge 'f', 'o', 'r' into 'for' b = [''.join(a[5:8])] # store 'for' in a variable a = a[:5] + b + a[8:] print(a) Output['g', 'e', 'e', 'k', 's', 'for', 'g', 'e', 'e', 'k', 's'] Other methods to merge list elements in python are:Table of ContentUsing List ComprehensionUsing itertools.groupbyUsing zip() and join()Using reduce() from functoolsUsing List ComprehensionList comprehension is a compact way to merge elements based on specific positions or conditions. Python a = list('geeksforgeeks') # Define the positions to merge in the list merge_positions = [(0, 5), (5, 8), (8, 13)] # Use list comprehension to merge elements into words result = [''.join(a[start:end]) for start, end in merge_positions] # Print the updated list print(result) Output['geeks', 'for', 'geeks'] Using itertools.groupbyThe itertools.groupby function groups consecutive elements together, which can be useful when merging similar characters or adjacent elements into words. Python import itertools a = list('geeksforgeeks') # Group the characters and merge consecutive ones into words grouped = [''.join(group) for key, group in itertools.groupby(a)] # Print the updated list print(grouped) Output['g', 'ee', 'k', 's', 'f', 'o', 'r', 'g', 'ee', 'k', 's'] Using zip() and join()If we want to merge alternate elements or pair elements together, we can use zip() along with join(). Python a = list('geeksforgeeks') # Merge 'g' and 'e', 'e' and 'k', etc. merged = [''.join(x) for x in zip(a[::2], a[1::2])] # Print the updated list print(merged) Output['ge', 'ek', 'sf', 'or', 'ge', 'ek'] Using reduce() from functoolsThe reduce() function from the functools module allows us to perform a cumulative operation on the list, which can be used for merging. Python from functools import reduce a = list("geeksforgeeks") # Use reduce to merge all elements into a single string merged = reduce(lambda x, y: x + y, a) # Print the merged string print(merged) Outputgeeksforgeeks Advertise with us Next Article Python | Concatenate N consecutive elements in String list M manjeet_04 Follow Similar Reads Python Lists In Python, a list is a built-in dynamic sized array (automatically grows and shrinks). We can store all types of items (including another list) in a list. 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