如何在python中永久编辑sys.executable？

Question

我正在尝试安装py2cairo但是我收到以下错误：

Checking for 'gcc' (c compiler)          : ok 
Checking for program python              : /usr/local/opt/python/bin/python 
python executable '/usr/local/opt/python/bin/python' different from sys.executable '/usr/local/opt/python/bin/python2.7'
Checking for python version              : (2, 7, 9, 'final', 0) 

which python的输出是：

/usr/local/opt/python/bin/python

和sys.executable是：

'/usr/local/opt/python/bin/python2.7'

所以我想知道如何使两者相同。

我正在使用MAC，但不确定它是否有任何区别。