我最近在我的机器上设置了拱形;安装了python。 // type of functions being binary operations
typedef int (binary_operation*)(int, int);
// now you can define any binary operation on ints
int add_op(int a, int b) { // definition };
int mul_op(int a, int b) { // definition };
// main...
binary_operation f;
if (oper == "+")
f = add_op;
sum = f(in1,int2);
符号链接到/usr/bin/python，/usr/bin/python3本身是/usr/bin/python3.4的符号链接。
因为，我使用python2.7，我继续将python与python2.7联系起来
现在，当我尝试python依赖程序时，我收到以下错误。
Traceback (most recent call last):
File "/usr/bin/pip", line 5, in <module>
from pkg_resources import load_entry_point
File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 3084, in <module>
@_call_aside
File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 3070, in _call_aside
f(*args, **kwargs)
File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 3097, in _initialize_master_working_set
working_set = WorkingSet._build_master()
File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 651, in _build_master
ws.require(__requires__)
File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 952, in require
needed = self.resolve(parse_requirements(requirements))
File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 839, in resolve
raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'pip==7.1.2' distribution was not found and is required by the application
我想知道出了什么问题。
答案 0 :(得分：2)
pip中的/usr/bin脚本与Python 3.4绑定。小脚本只是一个引导脚本，用于从模块加载实际代码。 Python 2.7中缺少该模块，因为您没有为它安装pip。
修复脚本以使用/usr/bin/python或install pip for Python 2.7替换第一行中的/usr/bin/python3。
或者，只将/usr/bin/python2链接到Python 2.7并让/usr/bin/python指向Python 3.无论如何，其他Arch程序很可能依赖于Python 3。另请参阅"Proper way" to manage multiple versions of Python on archlinux。