gdb python core dump file : not in executable format: File format not

[Wesley]

Hi guys,
   Today I am debugging an issue related to memory leak.
I use gdb 7.7 and python 2.7.6 to generate one core dump file from production env.

And then, just use gdb to debug the coredump upon the same machine.
Got error that seems not support debug core file using pyton?

Here is snippet:
[root at localhost server]# gdb --core  memleak.core 
GNU gdb (GDB) 7.7
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-unknown-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
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<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word".
[New LWP 25738]
[New LWP 25739]
[New LWP 25740]
[New LWP 25745]
[New LWP 25746]
[New LWP 25747]
[New LWP 25635]
Core was generated by `python'.
#0  0x00000030016e15e3 in ?? ()
(gdb) file /root/server/deviceserver.py 
"/root/server/deviceserver.py": not in executable format: File format not recognized
(gdb) file /root/server/deviceserver
/root/server/deviceserver: No such file or directory.
(gdb) file /root/server/deviceserver.py 
"/root/server/deviceserver.py": not in executable format: File format not recognized
(gdb)