Python Matplotlib Superscript

In scientific notation it is more proper to express fractional units with superscipts like ms^-1 instead of m/s.  To do this in labels in python's Matplotlib there is some special formating you need to do...

plt.ylabel(r'Wind Speed (ms$\mathregular{^{-1}}$)')

this will print "Wind Speed (ms^-1)" with the -1 as a superscript on the ylabel. The \mathregular expression makes the font not a fancy italic font. See here: http://stackoverflow.com/questions/21226868/superscript-in-python-plots