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When you import the module rlcompleter in a python script in Centos 6 (x86_64), the control sequence 033円[?1034h is printed in stdout. The problem is that these sequence is not visible by the user and cause a lot of confusion. 
In my case I compared the output of a python script (the integer 6) in bash and I got:
 test: 6: integer expression expected
How to reproduce:
 =============================
 BASH SCRIPT that calls test.py
 =============================
 id=$(./test.py)
 echo $id|sed -n l
 if test ${id} -eq 0;then
 fi
 =========
 test.py
 =========
 #!/usr/bin/python
 import rlcompleter
 a=2
 print a
========
OUTPUT
========
[valva@wn009 ~]$ bash p.sh 
033円[?1034h2$
p.sh: line 3: test: 2: integer expression expected
This only has happened to me in Centos 6 (python 2.6.5) I've tested in Centos 5, debian and Ubuntu and it does not happen.