iPython executes org.py in directory

Hello,

I have a file named org.py in the current working directory. Whenever I start ipython 4.2.0, it executes this file:

florian@asaru ~/scratch/calorg (git)-[master] % ipython
[ org.py output ]
Python 3.5.1 (default, Mar  3 2016, 09:29:07) 
Type "copyright", "credits" or "license" for more information.

IPython 4.2.0 -- An enhanced Interactive Python.
[...]

florian@asaru ~/scratch/calorg (git)-[master] % mv org.py foobar.py

florian@asaru ~/scratch/calorg (git)-[master] % ipython
Python 3.5.1 (default, Mar  3 2016, 09:29:07) 
Type "copyright", "credits" or "license" for more information.

IPython 4.2.0 -- An enhanced Interactive Python.
[...]

When I rename the file so something else it is no being executed.

org.py is an ordinary python script, without a shebang, and without a def __main__ (but some code on the leftmost indent).

Why is file being executed? Is its name somehow special? I haven't found anything about org.py being special.

Thanks,
Florian