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Firstly, the program creates a file named "outfile.txt", which contains the compressed data.Note that the data is compressed using a value of equal to 15.Both modes of operation are explained in this article.One of the best things, in my opinion, about the zlib library is that it is compatible with the gzip file format/tool (which is also based on DEFLATE), which is one of the most widely used compression applications on Unix systems.This example is very similar to the previous one in that we're decompressing data that originates from a file, except that in this case we're going back to using the one-off The above program opens the file "compressed.dat" created in a previous example, which contains the compressed "Hello world" string.In this example, once the compressed data is retrieved and stored in the variable are available to provide more flexibility by supporting compression/decompression of data streams.This can then be used to compress chunks of data in series.

The file is then decompressed using chunks of data.Again, in this example the file doesn't contain a massive amount of data, but nevertheless, it serves the purpose of explaining the buffer concept.The code is as follows: import zlib data = 'Hello world' compress = zlib.compressobj(zlib. DEFLATED, 15) compressed_data = compress.compress(data) compressed_data = compress.flush() print('Original: ' data) print('Compressed data: ' compressed_data) f = open('compressed.dat', 'w') f.write(compressed_data) f.close() CHUNKSIZE = 1024 data2 = zlib.decompressobj() my_file = open('compressed.dat', 'rb') buf = my_file.read(CHUNKSIZE) # Decompress stream chunks while buf: decompressed_data = data2.decompress(buf) buf = my_file.read(CHUNKSIZE) decompressed_data = data2.flush() print('Decompressed data: ' decompressed_data) my_file.close() The compressed data contained in a file can be easily decompressed, as you've seen in previous examples.Instead of having to accumulate all of the data in memory, you can just call function to compress the data in a file. In the example below we will compress a PNG image file named "logo.png" (which, I should note, is already a compressed version of the original raw image).The example code is as follows: import zlib original_data = open('logo.png', 'rb').read() compressed_data = zlib.compress(original_data, zlib.The zlib compression format is free to use, and is not covered by any patent, so you can safely use it in commercial products as well.