import error while performing ptestlong

sage 8.1.rc3 (also appears in earlier versions) "make ptestlong":

sage is accessing old installation of sympy, which is located in the last 
path of PYTHONPATH

~$ echo $PYTHONPATH 
:/home/georg/data/sync/software/Python:/tmp/pytex:/home/georg/data/sync/.system/extensions/python/lib:/home/georg/data/sync/.system/extensions/python/external_modules

I know I have to clean up my environment!
Unsetting PYTHONPATH solves this issue and ptestlong runs without any fail.
But shouldn't use sage it's own version of sympy before tracing back to 
another one?

Doctesting 3630 files using 8 threads.
Traceback (most recent call last):
  File "/mnt/software/sage-8.1.rc3/src/bin/sage-runtests", line 125, in 
<module>
    err = DC.run()
  File 
"/mnt/software/sage-8.1.rc3/local/lib/python2.7/site-packages/sage/doctest/control.py",
 
line 1144, in run
    self.run_doctests()
  File 
"/mnt/software/sage-8.1.rc3/local/lib/python2.7/site-packages/sage/doctest/control.py",
 
line 867, in run_doctests
    self.dispatcher = DocTestDispatcher(self)
  File 
"/mnt/software/sage-8.1.rc3/local/lib/python2.7/site-packages/sage/doctest/forker.py",
 
line 1403, in __init__
    init_sage()
  File 
"/mnt/software/sage-8.1.rc3/local/lib/python2.7/site-packages/sage/doctest/forker.py",
 
line 134, in init_sage
    from sympy.printing.pretty.stringpict import stringPict
  File 
"/home/georg/data/sync/.system/extensions/python/external_modules/sympy/__init__.py",
 
line 27, in <module>
    raise ImportError("It appears 2to3 has been run on the codebase. Use "
ImportError: It appears 2to3 has been run on the codebase. Use Python 3 or 
get the original source code.
Makefile:113: recipe for target 'ptestlong' failed
make: *** [ptestlong] Error 1

Georg


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