Filipe Laíns added the comment:
I tracked this down to zipimporter. I have one untested patch, when I run
python from my development tree for some reason the zipimport definition at
Lib/zipimport.py is not used. I assume something weird is going on because of
the frozen circular imports. I
New submission from Anthony Sottile :
```console
$ ln -s 'import os; os.system("echo hi")' __main__.py
$ ls -al
total 8
drwxr-xr-x 2 asottile asottile 4096 May 5 15:55 .
drwxr-xr-x 3 asottile asottile 4096 May 5 14:50 ..
lrwxrwxrwx 1 asottile asottile 31 May 5 15:55 __main__.py -> 'import
