问题
Recently, I made a simple change to some matplotlib code I run on OS X (10.10; Python 2.7.6), commenting out a single line that set the backend I use
#matplotlib.use('agg')
Now, as long as my code is running, I get a bouncing Python icon in my dock, that presents no UI and only offers Force Quit... as an command:
Generally dock icons that continue bouncing without any UI are a "bad thing". Why am I getting this and is it something I should be concerned about?
回答1:
Not a "bad thing". The icon appears in the dock when Python interacts with the GUI. Agg is a non-interactive backend. With agg you did not see the icon since there was no Python UI interaction.
来源：https://stackoverflow.com/questions/26680509/why-do-i-suddenly-have-a-bouncing-python-rocket