Linux上兩個(gè)版本的python。如何使2.7成為默認(rèn)我在linuxbox上有兩個(gè)版本的python：$pythonPython 2.6.6 (r266:84292, Jul 10 2013, 22:48:45) [GCC 4.4.7 20120313 (Red Hat 4.4.7-3)] on linux2Type "help", "copyright", "credits" or "license" for more information.>>> $ /usr/local/bin/python2.7Python 2.7.3 (default, Oct  8 2013, 15:53:09) [GCC 4.4.7 20120313 (Red Hat 4.4.7-3)] on linux2Type "help", "copyright", "credits" or "license" for more information.>>> $ which python/usr/bin/python$ ls -al /usr/bin/python-rwxr-xr-x. 2 root root 4864 Jul 10 22:49 /usr/bin/python如何使2.7成為默認(rèn)版本，所以當(dāng)我鍵入python這讓我進(jìn)了2.7？