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

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