Hello,

I have Mac OS 10.12.4 on MacBook Pro. I just installed Sage 7.6 from 
sage-7.6-OSX_10.12.3-x86_64.app.dmg. Unfortunately it is not working. See the 
output below from my terminal window. When I launched for first time it asked 
me if I wanted ti import old notebooks to new format. I said Yes. Not sure if 
this is causing the problem. Any help would be appreciated.

```
'/Volumes/LaCie/Applications/SageMath-7.6.app/Contents/Resources/sage/sage' 
--notebook=sagenb
Rubens-MacBook-Pro:~ ruben$ 
'/Volumes/LaCie/Applications/SageMath-7.6.app/Contents/Resources/sage/sage' 
--notebook=sagenb
RecursionError: maximum recursion depth exceeded during compilation
Traceback (most recent call last):
  File 
"/Volumes/LaCie/Applications/SageMath-7.6.app/Contents/Resources/sage/src/bin/sage-notebook",
 line 7, in <module>
    import argparse
  File 
"/Volumes/LaCie/Applications/SageMath-7.6.app/Contents/Resources/sage/local/lib/python/argparse.py",
 line 85, in <module>
    import collections as _collections
  File 
"/Volumes/LaCie/Applications/SageMath-7.6.app/Contents/Resources/sage/local/lib/python/collections.py",
 line 21, in <module>
    from operator import itemgetter as _itemgetter, eq as _eq
ImportError: 
dlopen(/Volumes/LaCie/Applications/SageMath-7.6.app/Contents/Resources/sage/local/lib/python2.7/lib-dynload/operator.so,
 2): Symbol not found: __PyUnicodeUCS4_AsDefaultEncodedString
  Referenced from: 
/Volumes/LaCie/Applications/SageMath-7.6.app/Contents/Resources/sage/local/lib/python2.7/lib-dynload/operator.so
  Expected in: flat namespace
 in 
/Volumes/LaCie/Applications/SageMath-7.6.app/Contents/Resources/sage/local/lib/python2.7/lib-dynload/operator.so
```

Regards,
Ruben

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