Python3 installed successfully, but cannot be opened in terminal

Question

Yesterday I've reinstalled my Mac OS X 10.8, before this reinstallation there were python2.7.5 and python3.3.2 installed on my machine and worked fine, but after this system reinstallation I cannot open python3 again. So I downloaded the DMG package of Python3 and reinstalled it again, but it still throwing this exception in terminal:

Fatal Python error: Py_Initialize: unable to load the file system codec 
File"/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/encodings/__init__.py", line 123
raise CodecRegistryError,\
                        ^
SyntaxError: invalid syntax
Abort trap: 6

Then a system problem report window appeared: it said:

Process:         Python [51780]
Path:            /Library/Frameworks/Python.framework/Versions/3.3/Resources/Python.app/Contents/MacOS/Python
Identifier:      Python
Version:         3.3.2 (3.3.2)
Code Type:       X86-64 (Native)
Parent Process:  bash [51586]
User ID:         501

Date/Time:       2013-09-23 00:40:19.908 +0800
OS Version:      Mac OS X 10.8.5 (12F37)
Report Version:  10

Interval Since Last Report:          77033 sec
Crashes Since Last Report:           1982088234
Per-App Crashes Since Last Report:   4
Anonymous UUID:                      1FEE4EB2-0D26-4DDF-9954-4423C040AECB

Crashed Thread:  0  Dispatch queue: com.apple.main-thread

Exception Type:  EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000

Application Specific Information:
abort() called

python3 tries to import stuff from python2 - have you set PYTHONPATH to the python2.7 library directory? — mata
– mata, Commented Sep 22, 2013 at 20:27
I never touched these python PATHs before, I've read this forum.codecall.net/topic/70489-python32-alongside-python27 and deleted everything containing "python" in my ~/.bash_profile and ~/.bash_aliases files, rebooted my machine, but it didn't work. You said PYTHONPATH, but I don't know where else could I found these settings? — Zhao Zhang
– Zhao Zhang, Commented Sep 22, 2013 at 21:41
Oh, I just tried echo $PYTHONPATH, it shows: /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7: , I'll try to delete it~ — Zhao Zhang
– Zhao Zhang, Commented Sep 22, 2013 at 21:42
Okay, I just tried unset PYTHONPATH , it did work~ now my python3 is good to go~ Thank you very much~ — Zhao Zhang
– Zhao Zhang, Commented Sep 22, 2013 at 21:48

kenorb · Accepted Answer · 2017-10-05 10:55:27Z

19

The solution is to unset $PYTHONPATH, then everything goes on well.

edited Oct 5, 2017 at 10:55

kenorb

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answered Oct 28, 2013 at 18:03

Zhao Zhang

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2 Comments

Brian Over a year ago

Also check if PYTHONHOME is set on windows system.

Hack-R Over a year ago

What if you can't unset the pythonpath because someone will hit you if you do?

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