python split list in half

Split list into smaller lists (split in half)

stackoverflow.com › questions › 752308 › split-list-into-smaller-lists-split-in-half

A = [1,2,3,4,5,6]
B = A[:len(A)//2]
C = A[len(A)//2:]

If you want a function:

def split_list(a_list):
    half = len(a_list)//2
    return a_list[:half], a_list[half:]

A = [1,2,3,4,5,6]
B, C = split_list(A)

Answer from Jason Coon on Stack Overflow

Stack Overflow

stackoverflow.com › questions › 752308 › split-list-into-smaller-lists-split-in-half

python - Split list into smaller lists (split in half) - Stack Overflow

Top answer

1 of 16

361

A = [1,2,3,4,5,6]
B = A[:len(A)//2]
C = A[len(A)//2:]

If you want a function:

def split_list(a_list):
    half = len(a_list)//2
    return a_list[:half], a_list[half:]

A = [1,2,3,4,5,6]
B, C = split_list(A)

2 of 16

109

A little more generic solution (you can specify the number of parts you want, not just split 'in half'):

def split_list(alist, wanted_parts=1):
    length = len(alist)
    return [ alist[i*length // wanted_parts: (i+1)*length // wanted_parts] 
             for i in range(wanted_parts) ]

A = [0,1,2,3,4,5,6,7,8,9]

print split_list(A, wanted_parts=1)
print split_list(A, wanted_parts=2)
print split_list(A, wanted_parts=8)

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GeeksforGeeks

geeksforgeeks.org › python › python-program-to-split-a-list-into-two-halves

Python Program to Split a List into Two Halves - GeeksforGeeks

July 23, 2025 - A second loop iterates over the second part of the list and adds each element to second_half. For working with numeric data or using the numpy library, numpy.array_split() provides a clean way to split lists (or arrays) into two or more parts.

Discussions

How can I split a Python list in half? - Ask a Question - TestMu AI (formerly LambdaTest) Community

How can I split a Python list in half? For example, if I have the list: A = [0, 1, 2, 3, 4, 5] I want to split it into two smaller lists: B = [0, 1, 2] C = [3, 4, 5] What is the best way to achieve this in Python? More on community.testmuai.com

community.testmuai.com

January 20, 2025

python - What is the most efficient way to split a list evenly in half - Stack Overflow

I need to split a list into halves such that if it has an odd length the middle element is ignored entirely, I have a function for this, but it's quite slow for what I'm trying to do. My function (variables renamed because they make no sense out of context): def splitList(array): half = ... More on stackoverflow.com

stackoverflow.com

Splitting an Array into two and Swapping the First Half With the Second Half

So this problem could actually be solved without any loops at all, just by using array splicing, you may want to take a look at that. Also, I'm not 100% sure, but I think in your odd example the output isn't actually what you want, since the 4 is out of place More on reddit.com

r/learnpython

May 18, 2020

Split list into smaller lists

There are likely some helper functions that make this possible in a line or two but it's almost 4am here so I'm drawing a blank. Doing it with a dumb loop is pretty simple though: def splitList(input, delim): # We'll return a list of lists outLists = [] # Read each item, if it's not the delimiter (e.g. "x") # add it to the current list. If it is the delimiter, # add the current list to the output and empty it. currentList = [] for item in input: if item == delim: if len(currentList) > 0: outLists.append(currentList) currentList = [] else: currentList.append(item) # If we get to the end and there are leftovers in the current # list, add them as well if len(currentList) > 0: outLists.append(currentList) return outLists You could call this like: splitList(your_list_above, "x") Might be some edge cases I'm not thinking of, maybe multiple delimiters in a row or something (?), didn't really test this but it should get you started Edit: Made a stupid mistake above but not going to fix it, should never use "input" as a variable, so call it something else, like "inputList" instead More on reddit.com

r/learnpython

January 6, 2021

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