ondrej@hawk:/tmp$ virtualenv-2.7 xx 
New python executable in xx/bin/python 
cInstalling setuptools............done. 
Installing pip...............done. 
ondrej@hawk:/tmp$ source xx/bin/activate 
(xx)ondrej@hawk:/tmp$ pip install sympy 
Downloading/unpacking sympy 
  Downloading sympy-0.7.2.rc1.python3.tar.gz (5.3Mb): 5.3Mb downloaded 
  Running setup.py egg_info for package sympy 
    Traceback (most recent call last): 
      File "<string>", line 14, in <module> 
      File "/tmp/xx/build/sympy/setup.py", line 36, in <module> 
        import sympy 
      File "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. 
    Complete output from command python setup.py egg_info: 
    Traceback (most recent call last): 

  File "<string>", line 14, in <module> 

  File "/tmp/xx/build/sympy/setup.py", line 36, in <module> 

    import sympy 

  File "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. 

---------------------------------------- 
Command python setup.py egg_info failed with error code 1 in /tmp/xx/build/sympy 
Storing complete log in /home/ondrej/.pip/pip.log