ZstdDecompressor.
How It Works
ZstdDecompressor.decompress() incrementally restores bytes from a compressed frame. Unlike the module-level decompress() helper, a single decompressor does not transparently handle multiple concatenated frames.
Step-by-Step Example
from compression.zstd import ZstdDecompressor, compress
source_bytes = b'archive-entry:' * 50
compressed_bytes = compress(source_bytes)
decompressor = ZstdDecompressor()
midpoint = len(compressed_bytes) // 2
restored_bytes = decompressor.decompress(compressed_bytes[:midpoint])
restored_bytes += decompressor.decompress(compressed_bytes[midpoint:])
print(restored_bytes == source_bytes)Understanding the Example
- The expression "b'archive-entry:' * 50" supplies the value stored as 'source_bytes'. This value is then used or checked by the later statements.
- The expression 'compress(source_bytes)' supplies the value stored as 'compressed_bytes'. This value is then used or checked by the later statements.
This example requires a newer interpreter or an optional standard-library component. If the import or function is unavailable, check the installed version and distribution before running it.
Where This Fits in a Real Program
A practical archive workflow has separate decisions for selection, compression, extraction and verification. When files come from other people, inspect paths, member counts and uncompressed sizes before writing anything; a successful decompression does not establish that its contents are trustworthy.
Practice: Try It Yourself
Decompress one Zstandard frame using two input chunks, then compare the restored bytes.
For this exercise, predict the result before running the changed code. Then explain the difference between the original and modified cases using the actual values, not just whether the program completed.
Further Reading
Read the official Python documentation for complete parameters, return types and exceptions.
Common Beginner Mistakes
- Feeding multiple frames to one decompressor and assuming all bytes will always be returned.
- Use the module-level helper for complete concatenated frames.
Key Takeaways
- ZstdDecompressor.
- ZstdDecompressor.decompress() incrementally restores bytes from a compressed frame.
- Use the module-level helper for complete concatenated frames.