indexed-gzip

import indexed_gzip as igzip import os # Create a dummy gzip file for demonstration dummy_data = b"This is some sample data for a gzipped file.\nRepeat this line many times to make it bigger.\n" * 10000 with open('test_file.gz', 'wb') as f: import gzip g = gzip.GzipFile(fileobj=f, mode='wb') g.write(dummy_data) g.close() # Open the indexed gzip file try: with igzip.IndexedGzipFile('test_file.gz') as fobj: print(f"Original file size: {len(dummy_data)} bytes") # Seek to an arbitrary position fobj.seek(15000) data = fobj.read(100) print(f"Read 100 bytes from offset 15000: {data.decode(errors='ignore')[:50]}...") # Seek to another position fobj.seek(5000) data = fobj.read(50) print(f"Read 50 bytes from offset 5000: {data.decode(errors='ignore')[:50]}...") # Build a full index explicitly (optional, often done on demand) fobj.build_full_index() print(f"Index built with {fobj.tell()} bytes processed.") finally: # Clean up the dummy file if os.path.exists('test_file.gz'): os.remove('test_file.gz')