What’s the best way to split a string into fixed length chunks and work with them in Python?

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One solution would be to use this function:

def chunkstring(string, length):
    return (string[0+i:length+i] for i in range(0, len(string), length))

This function returns a generator, using a generator comprehension. The generator returns the string sliced, from 0 + a multiple of the length of the chunks, to the length of the chunks + a multiple of the length of the chunks.

You can iterate over the generator like a list, tuple or string – for i in chunkstring(s,n):
, or convert it into a list (for instance) with list(generator). Generators are more memory efficient than lists because they generator their elements as they are needed, not all at once, however they lack certain features like indexing.

This generator also contains any smaller chunk at the end:

>>> list(chunkstring("abcdefghijklmnopqrstuvwxyz", 5))
['abcde', 'fghij', 'klmno', 'pqrst', 'uvwxy', 'z']

Example usage:

text = """This is the first line.
           This is the second line.
           The line below is true.
           The line above is false.
           A short line.
           A very very very very very very very very very long line.
           A self-referential line.
           The last line.
        """

lines = (i.strip() for i in text.splitlines())

for line in lines:
    for chunk in chunkstring(line, 16):
        print(chunk)

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