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QnD package

The qnd module (quick and dirty) provides a frontend for reading and writing self-describing binary files. Backends exist for HDF5 (via h5py), netCDF3, and PDB (via pure python code contained in QnD) file formats. netCDF4 is not specifically supported, but since it’s based on HDF5 such files can be treated as HDF5. Adding backends is not very difficult; the interface is well-defined and relatively small.

QnD is free and open-source, and hosted on LLNL’s public github.

This manual describes the design philosophy behind this user interface; in a nutshell, the idea is to keep things as simple as possible, but no simpler (as Einstein said). The problem we are setting out to solve is to store collections of scientific data, which means for the most part arrays of numbers.

Contents

• User Interface for Binary Files
  • Basic Usage
  • Recording History
  • Groups and lists of variables
  • Other attributes
• qnd.adict module
• qnd.frontend module
• qnd.generic module
• qnd.h5f module
• qnd.lazy module
• qnd.ncf module
• qnd.pdbdump module
• qnd.pdbf module
• qnd.pdbparse module
• qnd.utils module

Example

• Example Write HDF5 File
• Example Write PDB Files
• Example Read Files

Indices and tables

• Index
• Module Index
• Search Page