mcsema中python文件是放在/usr/local/lib/python2.7/dist-packages/mcsema_disass-2.0-py2.7.egg/mcsema_disass/目录下，所以一些ida接口也在/usr/local/lib/python2.7/dist-packages/mcsema_disass-2.0-py2.7.egg/mcsema_disass/下，在普通目录下引用ida不成功
linux环境下 python环境import找不到自定义的模块
问题现象：
Linux环境中自定义的模块ida，import ida出错。ida模块在/usr/local/lib/python2.7/dist-packages/mcsema_disass-2.0-py2.7.egg/mcsema_disass/目录下。
解决方法1：此种办法当时生效，但是需要写入每一个文件中，才能import不出错。
import sys
sys.path.append('export PYTHONPATH=$PYTHONPATH:/usr/local/lib/python2.7/dist-packages/mcsema_disass-2.0-py2.7.egg/mcsema_disass/')
import ida
import ida7
#成功
解决方法2：修改环境变量/etc/profile
vi /etc/profile 在最后一行添加
export PYTHONPATH=$PYTHONPATH:/usr/local/lib/python2.7/dist-packages/mcsema_disass-2.0-py2.7.egg/mcsema_disass/
source /etc/profile 立即生效，所有文件都可以引入/usr/local/lib/python2.7/dist-packages/mcsema_disass-2.0-py2.7.egg/mcsema_disass/下的模块。