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The audio modules often need convert between little endian and big endian data. The array module can be used to byteswap 16- and 32-bit samples, but it can't help with 24-bit samples. Python implemented function for swapping bytes is not very efficient. In any case the use of array is not so simple (see bpo-19276, bpo-19633).
The proposed patch adds efficient byteswap() function in the audioop module. byteswap(fragment, width) byteswaps every "width"-byte sample in the fragment and returns modified data.