Methods of splitting list strings by specified number in Python

introduction

When processing list data, sometimes we need to split a list of long strings into multiple lists of small strings of a specific length. This isText processing, batch data processing or when we need to chunk dataparallelVery common when dealing with it. As a powerful programming language, Python provides many convenient ways to implement this function. This article will explore how to split strings in a list by a certain number in Python and provide practical code examples.

Basic Methods

We will use Python's list comprehension and slice operations to achieve this. Create a firstfunction, it accepts aList of stringsand a number that specifies the size of each split block.

def split_strings_in_list(string_list, chunk_size):



# Process each string element in the list



    return [



# Slice a single string and split it into substrings of the specified size



        [string[i:i + chunk_size] for i in range(0, len(string), chunk_size)]



        for string in string_list



    ]

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Example of usage

Considering that we have a list of several long strings, and we want to split each string into a substring of length 5.

# Original string list




string_list = ["hellopythonworld", "listcomprehensionisuseful", "splittingstrings"]



 



# Call the function to specify the size of each split block as5




split_list = split_strings_in_list(string_list, 5)



 



# View output results




for sublist in split_list:



    print(sublist)

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The output will be:

['hello', 'pytho', 'nworl', 'd']



['listc', 'ompre', 'hensi', 'onisu', 'seful']



['splitt', 'ingst', 'rings']

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Handle uneven strings

If the string length cannot be divided by the size of the split block, the last block may be smaller than the other blocks. The above method has dealt with this situation and no additional modification is required.

Code optimization

In some cases, we may need to optimize this function. For example, if we know that all strings in the list are very similar in length, we can process the entire list at once instead of processing each string in the list one by one.

def split_string_list_optimized(string_list, chunk_size):



# Concatenate all strings together first



    joined_string = "".join(string_list)



    



# Then follow chunk_sizesplit, this will return a huge list



    all_chunks = [joined_string[i:i + chunk_size] for i in range(0, len(joined_string), chunk_size)]



    



# Limit factor to determine when to create a new sublist



    limit = len(all_chunks) // len(string_list)



    



# Split huge lists into each list chunk_sizeSmall list of sizes



    return [all_chunks[i * limit:(i + 1) * limit] for i in range(len(string_list))]

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Things to note when using the situation

When using the above functions, you need to pay attention to the original structure and final requirements of the data. If each string in the original data is a separate unit, the first method is most appropriate. But if all strings can be considered as a continuous stream of data, the second optimization method may be more appropriate.

Summarize

In Python, segmenting strings in a list by a certain number is a common task, which can be accomplished through simple list derivation and slice operations. This article introduces two methods: one is suitable for the conventional scenario where each string in the list is processed separately, and the other is an optimization method when all strings can be processed as a whole.