%precision 2 on Python
This is an IPython magic. It controls how floats display:
>>> 1.2345
1.2345
>>> %precision 2
'%.2f'
>>> 1.2345
1.23
Documented here.
Note: It suggests your script was intended to be executed within an IPython runtime (such as a notebook). In a regular Python interpreter that will be a syntax error.
This is to set a floating point precision for printing. It sets the floating point to 2 decimal points. This doesn't work in all interpreters though, but it does work in Jupyter-Notebook.
NB: Thanks to Chrisz for the point.