"""
Data input and output
=====================

  Classes

     npfile -- a class for reading and writing numpy arrays from / to binary files
     Cache
     DataSource
     Repository

  Functions

     read_array -- reading ascii streams into NumPy arrays
     write_array -- write an array to an ascii stream
     loadmat -- read a MATLAB style mat file (version 4 and 5)
     savemat -- write a MATLAB (version <= 4) style mat file

     fread -- low-level reading
     fwrite -- low-level writing
     bswap -- in-place byte-swapping
     packbits -- Pack a binary array of 1's and 0's into an array of bytes
     unpackbits -- Unpack an array packed by packbits.

     save --- simple storing of Python dictionary into module
               that can then be imported and the data accessed as
               attributes of the module.

     mminfo   -- query matrix info from Matrix Market formatted file
     mmread   -- read matrix from Matrix Market formatted file
     mmwrite  -- write matrix to Matrix Market formatted file

"""
postpone_import = 1