Python Zlib Module
The zlib module provides access to the zlib library for data compression and decompression. It is compatible with the gzip file format.
Importing the Module
import zlibCompression
zlib.compress()
Compresses the bytes in data.
import zlib
data = b'Hello, world! Hello, world! Hello, world!'
compressed_data = zlib.compress(data)
print(f"Original size: {len(data)}")
print(f"Compressed size: {len(compressed_data)}")Compression Levels
You can specify a compression level from 0 (no compression) to 9 (best compression). The default is 6.
compressed_data = zlib.compress(data, level=9)Decompression
zlib.decompress()
Decompresses the bytes in data.
decompressed_data = zlib.decompress(compressed_data)
print(decompressed_data)
# Output: b'Hello, world! Hello, world! Hello, world!'Checksums
The zlib module can calculate checksums (CRC32 and Adler32) to verify data integrity.
zlib.crc32()
Computes a CRC (Cyclic Redundancy Check) checksum of data.
import zlib
data = b'Hello, world!'
checksum = zlib.crc32(data)
print(f"CRC32: {checksum}")zlib.adler32()
Computes an Adler-32 checksum of data.
import zlib
data = b'Hello, world!'
checksum = zlib.adler32(data)
print(f"Adler32: {checksum}")