如何恢复旧python

我想将我的mac恢复为只使用python2，因为我认为我在安装python3时做错了什么。现在我明白了：

python -v
# installing zipimport hook
import zipimport # builtin
# installed zipimport hook
# /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site.pyc matches /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site.py
import site # precompiled from /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site.pyc
# /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/os.pyc matches /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/os.py
import os # precompiled from /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/os.pyc
import errno # builtin
import posix # builtin
# /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/posixpath.pyc matches /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/posixpath.py
import posixpath # precompiled from /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/posixpath.pyc
# /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/stat.pyc matches /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/stat.py
import stat # precompiled from /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/stat.pyc
# /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/genericpath.pyc matches /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/genericpath.py
import genericpath # precompiled from /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/genericpath.pyc
# /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/warnings.pyc matches /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/warnings.py
import warnings # precompiled from /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/warnings.pyc
# /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/linecache.pyc matches /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/linecache.py
import linecache # precompiled from /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/linecache.pyc
# /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/types.pyc matches /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/types.py
import types # precompiled from /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/types.pyc
# /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/UserDict.pyc matches /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/UserDict.py
import UserDict # precompiled from /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/UserDict.pyc
# /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/_abcoll.pyc matches /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/_abcoll.py
import _abcoll # precompiled from /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/_abcoll.pyc
# /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/abc.pyc matches /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/abc.py
import abc # precompiled from /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/abc.pyc
# /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/_weakrefset.pyc matches /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/_weakrefset.py
import _weakrefset # precompiled from /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/_weakrefset.pyc
import _weakref # builtin

我做了什么

我只是不知道错误是什么。还有一个问题：

dbconf -a lms -d wu-llm -e prod get lms_core.db_root_pwd
Traceback (most recent call last):
  File "/usr/local/bin/dbconf", line 8, in <module>
    sys.exit(main())
  File "/usr/local/lib/python2.7/site-packages/dbconf/__init__.py", line 418, in main
    args.func(get_domains(args), args)
  File "/usr/local/lib/python2.7/site-packages/dbconf/__init__.py", line 66, in get_domains
    return [get_domain(domain, args.app, env) for env in args.environments for domain in args.domains]
  File "/usr/local/lib/python2.7/site-packages/dbconf/__init__.py", line 60, in get_domain
    parser.error("domain does not exist: %s" % name)
AttributeError: 'NoneType' object has no attribute 'error'

dbconf-a lms-d wu llm-e prod get lms_core.db_root_pwd
回溯（最近一次呼叫最后一次）：
文件“/usr/local/bin/dbconf”，第8行，在
sys.exit（main（））
文件“/usr/local/lib/python2.7/site packages/dbconf/_init__.py”，主目录第418行
args.func（获取域（args），args）
get_域中的文件“/usr/local/lib/python2.7/site packages/dbconf/_init__uuu.py”，第66行
返回[get_domain（domain，args.app，env）for args.environments for domain in args.domains]
get_域中的文件“/usr/local/lib/python2.7/site packages/dbconf/_init__uuu.py”，第60行
解析程序。错误（“域不存在：%s”%name）
AttributeError:“非类型”对象没有属性“错误”

。请不要问重复的问题。如果您想添加详细信息，可以添加。这是否回答了您的问题？不，不是。不确定这是否是“如何将python命令更改为再次使用python 2”的副本。python2还在你的系统中吗？（使用例如

find/| grep python$

检查python可执行文件的位置）如果是，这是一个重复的问题。如果没有，您首先需要再次安装python2。