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Python 3.6

wick is a Python command line tool that generates file I/O source code for working with binary data.


$ pip install wick


$ wick common.h --language=python

What exactly does it do?

Let's walk through a concrete example.

Say we have binary data that is a sequence of records that are represented by a string name and an integer id. We can write a simple C struct representation of this data.

// record.h

// Simple Record
struct Record {
    // Record name
    char name[64];

    // Record id.
    unsigned char id;

Then we run wick on the file:

$ wick record.h --language=python

Which will then emit:

import struct

class Record:
    """Simple Record
        name: Record name
        id: Record id.

    format = '<64sB'
    size = struct.calcsize(format)

    slots = (

    def __init__(self,
    = name = id

    def write(cls, file, record):
        record_data = struct.pack(cls.format, 

    def read(cls, file):
        record_data =
        record_struct = struct.unpack(cls.format, record_data)
        return Record(*record_struct)

Then we can import this code into Python and do work.

Read Data

with open(path, 'rb') as file:
    rec =

Write Data

with open(path, 'wb') as file:
    rec = Record(b'name', 0)
    Record.write(file, rec)

Unpack Lots of Data

import struct

# Assuming the file only contains Record data
with open(path, 'rb') as file:
    recs = [Record(*chunk) for chunk in struct.iter_unpack(Record.format,]


Have a bug fix or a new feature you'd like to see in wick? Send it our way! Please make sure you create an issue that addresses your fix/feature so we can discuss the contribution.

  1. Fork this repo!
  2. Create your feature branch: git checkout -b features/add-javascript-code-generator
  3. Commit your changes: git commit -m 'Implemented Javascript code generator'
  4. Push the branch: git push origin add-javascript-code-generator
  5. Submit a pull request.
  6. Create an issue.



See the license document for the full text.

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