The file pymindb.py uses the famous CERN fitting program MINUIT (via the pyminuit package) to give you access to all the power of that program. It also uses a somewhat more compact (if a bit esoteric) numpy.loadtxt('dbf.dat') method for reading in all the data in one step; note hoever that the elements in the data table must be separated by exactly one space for this to work properly.
Both are poorly optimized implementations by JHB. You can certainly handle the data input, plotting and other features much more elegantly if you spend more time on the scripts, but this will do in a pinch!