現在可以了

[octopus@pc3 ~]$ python
Python 2.7.10 (default, Jul  5 2015, 14:15:43)
[GCC 5.1.1 20150618 (Red Hat 5.1.1-4)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> help
Type help() for interactive help, or help(object) for help about object.
>>> echo 8
  File "<stdin>", line 1
    echo 8
         ^
SyntaxError: invalid syntax
>>> if 1 + 1 == 2:
... end
  File "<stdin>", line 2
    end
      ^
IndentationError: expected an indented block
>>> exit
Use exit() or Ctrl-D (i.e. EOF) to exit
>>> exit()
[octopus@pc3 ~]$ gcc
gcc: fatal error: no input files
compilation terminated.
[octopus@pc3 ~]$ g++
g++: fatal error: no input files
compilation terminated.
[octopus@pc3 ~]$

今天還行