Long-Slit Reduction in Python (pt. 2)

Some other projects have taken priority, and I haven't had time to complete my Python data reduction experiment. For anyone interested in trying Python for FITS data reduction, I've placed my incomplete reduction script at this link.

The script includes basic processing steps, including,

• Processing darks and flats,
• Applying dark and flat correction to image data (for a single image),
• Identifying the location of bright lines on arc-lamp images, tracing them along the spatial axis, and applying an interpolation to rectify an image along the wavelength axis. 

What's missing?

• I haven't calculated a wavelength calibration solution based on arc lamp observations.
• I haven't rectified images along the spatial axis.