【发布时间】：2014-10-29 17:34:32
【问题描述】：
我有 Python 2.6.6。在我的 Red Hat Linux VM 上运行某个脚本。需要升级到 3.4.1。试过了
easy_install --upgrade python
但我总是得到
bash-4.1# easy_install --upgrade python
Searching for python
Reading http://pypi.python.org/simple/python/
Reading http://www.python.org
Reading http://www.python.org/2.3
Reading http://www.python.org/2.4
Reading http://www.python.org/2.4.1
Reading http://www.python.org/2.5
Reading http://www.python.org/download/
Best match: Python 3.4.1
Downloading https://www.python.org/ftp/python/3.4.1/Python-3.4.1.tgz
Processing Python-3.4.1.tgz
Running Python-3.4.1/setup.py -q bdist_egg --dist-dir /tmp/easy_install-Qd_HVP/Python-3.4.1/egg-dist-tmp-iqaG4H
Traceback (most recent call last):
File "/usr/bin/easy_install", line 9, in <module>
load_entry_point('distribute==0.6.10', 'console_scripts', 'easy_install')()
File "/usr/lib/python2.6/site-packages/setuptools/command/easy_install.py", line 1715, in main
with_ei_usage(lambda:
File "/usr/lib/python2.6/site-packages/setuptools/command/easy_install.py", line 1696, in with_ei_usage
return f()
File "/usr/lib/python2.6/site-packages/setuptools/command/easy_install.py", line 1719, in <lambda>
distclass=DistributionWithoutHelpCommands, **kw
File "/usr/lib64/python2.6/distutils/core.py", line 152, in setup
dist.run_commands()
File "/usr/lib64/python2.6/distutils/dist.py", line 975, in run_commands
self.run_command(cmd)
File "/usr/lib64/python2.6/distutils/dist.py", line 995, in run_command
cmd_obj.run()
File "/usr/lib/python2.6/site-packages/setuptools/command/easy_install.py", line 236, in run
self.easy_install(spec, not self.no_deps)
File "/usr/lib/python2.6/site-packages/setuptools/command/easy_install.py", line 472, in easy_install
return self.install_item(spec, dist.location, tmpdir, deps)
File "/usr/lib/python2.6/site-packages/setuptools/command/easy_install.py", line 502, in install_item
dists = self.install_eggs(spec, download, tmpdir)
File "/usr/lib/python2.6/site-packages/setuptools/command/easy_install.py", line 681, in install_eggs
return self.build_and_install(setup_script, setup_base)
File "/usr/lib/python2.6/site-packages/setuptools/command/easy_install.py", line 958, in build_and_install
self.run_setup(setup_script, setup_base, args)
File "/usr/lib/python2.6/site-packages/setuptools/command/easy_install.py", line 947, in run_setup
run_setup(setup_script, args)
File "/usr/lib/python2.6/site-packages/setuptools/sandbox.py", line 29, in run_setup
lambda: execfile(
File "/usr/lib/python2.6/site-packages/setuptools/sandbox.py", line 70, in run
return func()
File "/usr/lib/python2.6/site-packages/setuptools/sandbox.py", line 31, in <lambda>
{'__file__':setup_script, '__name__':'__main__'}
File "setup.py", line 1865
exec(f.read(), globals(), fficonfig)
SyntaxError: unqualified exec is not allowed in function 'configure_ctypes' it contains a nested function with free variables
bash-4.1# SyntaxError: unqualified exec is not allowed in function 'configure_ctypes' it contains a nested function with free variables
当然，我不能从机器中删除 Python 2.6.6，因为很多系统脚本都依赖它。有什么想法吗？
【问题讨论】：
-
简易安装用于升级包。选中此项以安装 Python 3 stackoverflow.com/questions/8087184/installing-python3-on-rhel
-
“当然，我不能从机器上删除 Python 2.6.6，因为很多系统脚本都依赖它。”根据定义，这意味着您无法升级它。你可以做的是并排安装一个新的。幸运的是，Python 可以很容易地拥有两个不同的次要版本，甚至更容易拥有两个不同的主要版本。例如，您可以使用
python3或python3.4运行3.4 版本，即使2.6 在您的PATH 上更高，并且脚本（easy_install、pip、ipython等）将得到类似的处理. -
使用虚拟环境
-
我正在使用来自问题stackoverflow.com/questions/8087184/installing-python3-on-rhel 的答案，即手动安装它。只有一件事不清楚。它不会改变
python -V返回的值。我的 python 脚本正在由自动化工具运行。它将尝试使用它找到的默认 python。不知道该走哪条路。 -
好的。我做到了，手动安装。我现在如何使用它？我的自动化工具如何知道要使用哪个 python？