Matplotlib: strings as axis labels

I wanted to make a plot that shows the relation of some galaxy properties vs. their Hubble subtype. The subtypes were saved as strings at my database, I selected them, converted back to numbers. Why back? Because some colleagues of mine, who think in words, classified all the 900 galaxies by their Hubble types, then their classifications were converted into numbers, means and probabilities calculated, and converted back to types.
Anyway, I wanted to have types on my axis, so I did it thus. Here's the plot:

Matplotlib: errorbar throws a ValueError: too many values to unpack

I've been working on the errorbars in Matplotlib, and kept getting this error.
To avoid it, check your array dimensions: errorbar(), unlike scatterplot(), keeps on insisting on (x, ) error array dimensions.
1D arrays (vectors) in Numpy can be of shape (x, 1) or (x, ). That's usually interchangeable, but in cases like that, np.reshape(x, (x.shape[0], )) does the trick.
I think hope there is a deep underlying reason for that.

some Python scripts from Durham

A pile of interesting astrophysics scripts, especially the one creating images from GALFIT output files and the other plotting Petrosian quantities for different n.