Python zlib Module - Examples and Use

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Python zlib module

zlib is a python module used for the compression of the data. There are several methods that can make data compression and decompression very easy. The zlib python module internally use the zlib general version.

Compressing data with the help of zlib Python

zlib provide the compress method to compress the bytes data. The data can come from the network, from a file or even static data. 

Example of the Compression with zlib Python module

the following example make use of the zlib.compress() method to compress the data. it will return compressed data. 


import zlib
compressed_data= zlib.compress(b'alixaprodev.com')
print(compressed_data)

    

The zlib.compress() method can take a few parameters that is optional but you can have over control over it. Click here to learn more about the zlib.compress() method of the zlib module in a python programming language.

Decompression of data with the help of zlib Python

The same way you compressed the data with python zlib.compress() method in the above example you can also get the exact data with the help of another popular method of the zlib python module very easily. the method is zlib.decomrepss().

Example of the Decompression with zlib Python Module

the following example uses the zlib.decompress method to decompress the previously compressed data and get back the original bytes data from that.


import zlib
compressed_data= zlib.compress(b"alixaprodev.com")
print(compressed_data)

orignal_data=zlib.decompress(compressed_data)
print(orignal_data)

The same case is with the Decompression of the data. the zlib.decomrpess() method is a very frequently used method of the python module and it can also take certain parameters, which are optional but can give you over control in same times are very helpful to use. check here to learn more about the zlib.decomrpess() python method of the zlib built-in moudle.

FAQ about the zlib python module

Below are some important methods that are used by the developers and have certain purposes.

What does the flush() method of zlib module do? if this method is called on the zlib.compress Object then all the input will get processed. It takes an argument that specifies the mode of the flushing.

Z_NO_FLUSH, Z_PARTIAL_FLUSH, Z_SYNC_FLUSH, Z_FULL_FLUSH, Z_BLOCK, Z_FINISH are the parameters that you should specify one of then while calling this method.

This method is helpful if we are receiving the data from a network streaming. if we pass the other values except for the Z_FINISH we can compress the other data. but if we pass Z_FINISH then further compression is stopped by the method.

Once we call the flush() method with the Z_FINISH we can not call the compress method of the Compress class again, as we have finished its working.

Example fo the flush() method of the zlib module


import zlib
compressed_obj= zlib.compressobj()
compressed_obj.flush(zlib.Z_NO_FLUSH)

In the same way you can call the flush method with the to decompress object as well. in the below example you will see how we call the flush() method with the Decompressed object.


import zlib

decompressed_obj= zlib.decompressobj()
decompressed_obj.flush(zlib.Z_NO_FLUSH)

To Learn More about the Topic:

  1. Official Documentation of the zlib Module in Python
  2. Learn about the zlib.compress()
  3. Learn about the zlib.decompress()

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