On Wednesday, August 24, 2016 at 1:31:32 PM UTC-4, ahaus...@umassd.edu 
wrote:
>
>
>
> The server of Sage 7.3 for Mac OS 10.11.6  (the app version) will not 
> start! 
> Here is the  error report from the Terminal:
>
>
> --------------------------------------------------------------------------------------------------------------------
>
> Last login: Wed Aug 24 12:07:55 on console
> DT-319195-MTH:~ amarzullo$ 
> '/Applications/SageMath-7.3.app/Contents/Resources/sage/sage' 
> --notebook=sagenb Fatal Python error: Py_Initialize: unable to load the 
> file system codec 
>
> File 
> "/Applications/SageMath-7.3.app/Contents/Resources/sage/local/lib/python/encodings/__init__.py",
>  
> line 123 raise CodecRegistryError,\ 
>
> ^ SyntaxError: invalid syntax 
>
> Current thread 0x00007fff7a084000 (most recent call first): 
> /Applications/SageMath-7.3.app/Contents/Resources/sage/sage: line 130: 1300 
> Abort trap: 6 Traceback (most recent call last): 
>
> "$SAGE_ROOT/relocate-once.py" 
>
> File 
> "/Applications/SageMath-7.3.app/Contents/Resources/sage/src/bin/sage-notebook",
>  
> line 7, in <module> import argparse 
>
> File 
> "/Applications/SageMath-7.3.app/Contents/Resources/sage/local/lib/python/argparse.py",
>  
> line 85, in <module> import collections as _collections 
>
> File 
> "/Applications/SageMath-7.3.app/Contents/Resources/sage/local/lib/python/collections.py",
>  
> line 9, in <module> from operator import itemgetter as _itemgetter, eq as 
> _eq 
>
> ImportError: 
> dlopen(/Applications/SageMath-7.3.app/Contents/Resources/sage/local/lib/python2.7/lib-dynload/operator.so,
>  
> 2): Symbol not found: __PyUnicodeUCS4 _AsDefaultEncodedString 
>
> Referenced from: 
> /Applications/SageMath-7.3.app/Contents/Resources/sage/local/lib/python2.7/lib-dynload/operator.so
>  
>
>
> Expected in: flat namespace
> in 
> /Applications/SageMath-7.3.app/Contents/Resources/sage/local/lib/python2.7/lib-dynload/operator.so
>  
>
>
> DT-319195-MTH:~ amarzullo$ 
> .app/Contents/Resources/sage/local/lib/python2.7/lib-dynload/operator.so
> -bash: 
> .app/Contents/Resources/sage/local/lib/python2.7/lib-dynload/operator.so: 
> No such file or directory
>
> ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Note: I had to download the app DMG  version of Sage 7.3 several times 
> before it would copy without giving error messages about the file being 
> corrupted!
>
>
> I am using a Mid 2012 iMac i5, 20 GB of ram with Mac OS 10.11.6.
>
> Any ideas?
>  
>
Regards,
>
> Adam Hausknecht
>



 Thanks Lief.

I  installed Anaconda Python 3.5.x before installing Sage-7.3 which added a 
change to the PATH setting in the .bash_profile file. 
I commented out this change in the .bash_profile and after restarting I was 
able install and launch Sage-7.3. I then restored the .bash_profile file
and now all seems to be OK.

Adam

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