anatoly techtonik added the comment:

The perl syntax supported $0 according to this doc 
http://turtle.ee.ncku.edu.tw/docs/perl/manual/pod/perlre.html but was removed 
for unknown reason. Using the fact that support is removed without knowing the 
true reason is "cargo cult argument", which I hope is not acceptable for Python 
development.

Among the possible reason can be binding of $0 to the __file__ analogue 
according to this doc - 
http://www.cs.cmu.edu/afs/cs/usr/rgs/mosaic/pl-predef.html

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue17426>
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