Debugging boost python shared lib of python ROS node, with gdb

At some_ros_package/scripts/some_node.py
Add next break points for python.

```
if __name__ == '__main__':
    from os import getpid
    print 'pid = ', getpid()
    import pdb;
    pdb.set_trace()
```

if pid number is 1234, type next commands at other terminal,

```
$  sudo gdb
gdb) attach 1234
gdb) break ~~~~
gdb) continue
```

After make break point at cppfile, continue python ros node.

```
pdb)  continue
```


* If you need symbol file,.
https://stackoverflow.com/questions/20380204/how-to-load-multiple-symbol-files-in-gdb

```
gdb) add-symbol-file filename address
```