{"id":4383,"library":"pybytebuffer","title":"PyByteBuffer","description":"PyByteBuffer is a Python library for manipulating byte buffers, drawing inspiration from Java's `java.nio.ByteBuffer`. It provides methods for writing and reading various data types (integers, strings, arrays, bytes) into a buffer with control over aspects like endianness and position. The current stable version is 1.0.5, released in late 2020, and it appears to be in a maintenance status, stable for its intended functionality.","status":"maintenance","version":"1.0.5","language":"en","source_language":"en","source_url":"https://github.com/iGio90/PyByteBuffer","tags":["bytes","buffer","java-nio","binary-data","endianness"],"install":[{"cmd":"pip install PyByteBuffer","lang":"bash","label":"Install latest version"}],"dependencies":[],"imports":[{"symbol":"ByteBuffer","correct":"from PyByteBuffer import ByteBuffer"}],"quickstart":{"code":"from PyByteBuffer import ByteBuffer\n\n# Create a ByteBuffer with an initial capacity\nbb = ByteBuffer(1024)\n\n# Write various data types\nbb.write(12345, 'int', 4)  # Write an int (4 bytes)\nbb.write('Hello PyByteBuffer', 'str') # Write a string\nbb.write(b'\\x01\\x02\\x03', 'bytes') # Write raw bytes\n\n# Reset position to read from the beginning\nbb.position(0)\n\n# Read the data back\nint_val = bb.read('int', 4)\nstr_val = bb.read('str', 18) # Read 18 characters for 'Hello PyByteBuffer'\nbytes_val = bb.read('bytes', 3)\n\nprint(f'Read int: {int_val}')\nprint(f'Read string: {str_val}')\nprint(f'Read bytes: {bytes_val}')\n\n# Example of getting without advancing position\nbb.position(0)\nfirst_byte = bb.get()\nprint(f'First byte (get, position unchanged): {first_byte}')\nprint(f'Position after get(): {bb.position()}')\nfirst_byte_again = bb.get()\nprint(f'First byte again (get, position unchanged): {first_byte_again}')","lang":"python","description":"This quickstart demonstrates how to create a ByteBuffer, write different data types into it, reset its position, and then read the data back. It also highlights the behavior of `get()` versus `read()` methods concerning position advancement."},"warnings":[{"fix":"Explicitly call `buffer.position(new_pos)` or use `buffer.read(...)` methods which advance the position automatically.","message":"Operations like `get()` (for reading a single byte/value) do not advance the buffer's internal `position`, mimicking Java's `ByteBuffer`. This differs from typical Python stream-like objects where `read()` usually advances the cursor. Use `read()` methods or explicitly manage `position()` for sequential reading.","severity":"gotcha","affected_versions":"All versions"},{"fix":"Always explicitly specify endianness (e.g., `bb.write(value, 'int', 4, endian='big')`) if data exchange requires it, or if consistency across different systems is important.","message":"When writing or reading integers, endianness matters. If not specified during a `write` operation, the system's default endianness is used. Reading with an incorrect endianness can lead to corrupted data. Be explicit, especially when dealing with network protocols or cross-platform data.","severity":"gotcha","affected_versions":"All versions"},{"fix":"Profile code that heavily uses `int` to `bytes` or `bytes` to `int` conversions. Consider batching operations or alternative approaches if performance becomes an issue.","message":"The library documentation notes that performance considerations 'are all around the conversion between int->bytes bytes<-int'. Frequent or unoptimized conversions, especially in performance-critical loops, could lead to bottlenecks.","severity":"gotcha","affected_versions":"All versions"}],"env_vars":null,"last_verified":"2026-04-12T00:00:00.000Z","next_check":"2026-07-11T00:00:00.000Z"}