I am trying to install SageMath 7.5.1 on my MacBook Pro with macOS 10.12.2. 
I don't know if it matters but I am using Python from Anaconda distribution.
After opening the dmg file, this is what I get:

MacBook-Pro-de-Sergio:~ sergiobacelar$ 
'/Applications/SageMath-7.5.1.app/Contents/Resources/sage/sage' --notebook=
sagenb

 

Fatal Python error: Py_Initialize: unable to load the file system codec 

  File 
"/Applications/SageMath-7.5.1.app/Contents/Resources/sage/local/lib/python/encodings/__init__.py"
, line 123 

    raise CodecRegistryError,\ 

                            ^ 

SyntaxError: invalid syntax 


 

Current thread 0x00007fffefff43c0 (most recent call first): 

/Applications/SageMath-7.5.1.app/Contents/Resources/sage/sage: line 130: 
23627 Abort trap: 6           "$SAGE_ROOT/relocate-once.py" 

Traceback (most recent call last): 

  File 
"/Applications/SageMath-7.5.1.app/Contents/Resources/sage/src/bin/sage-notebook"
, line 7, in <module> 

    import argparse 

  File 
"/Applications/SageMath-7.5.1.app/Contents/Resources/sage/local/lib/python/argparse.py"
, line 85, in <module> 

    import collections as _collections 

  File 
"/Applications/SageMath-7.5.1.app/Contents/Resources/sage/local/lib/python/collections.py"
, line 21, in <module> 

    from operator import itemgetter as _itemgetter, eq as _eq 

ImportError: dlopen(/Applications/SageMath-7.5.1.app/Contents/Resources/sage
/local/lib/python2.7/lib-dynload/operator.so, 2): Symbol not found: 
__PyUnicodeUCS4_AsDefaultEncodedString 

  Referenced from: /Applications/SageMath-7.5.1.app/Contents/Resources/sage/
local/lib/python2.7/lib-dynload/operator.so 

  Expected in: flat namespace 

 in /Applications/SageMath-7.5.1.app/Contents/Resources/sage/local/lib/
python2.7/lib-dynload/operator.so


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