If I have this piece of code:
import csv
%precision 2
with open('blah.csv') as csvfile:
blah = list(csv.DictReader(csvfile))
What does it means the %precision 2
line?
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.
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