First install the python-pip package and use "pip freeze" command to display the Modules.
[root@ceph01-server ~]# python --version
Python 2.6.6
[root@ceph01-server ~]# pip freeze
Cheetah==2.4.1
Markdown==2.0.1
PyYAML==3.10
Pygments==1.1.1
argparse==1.2.1
backports.ssl-match-hostname==3.4.0.2
boto==2.32.1
ceph-deploy==1.5.17
chardet==2.0.1
cloud-init==0.7.4
configobj==4.6.0
distribute==0.7.3
heat-cfntools==1.2.6
iniparse==0.3.1
jsonpatch==1.2
jsonpointer==1.0
ordereddict==1.1
policycoreutils-default-encoding==0.1
prettytable==0.7.2
psutil==0.6.1
pycurl==7.19.0
pygpgme==0.1
requests==1.1.0
setools==1.0
six==1.7.3
urlgrabber==3.9.1
urllib3==1.5
yum-metadata-parser==1.1.2
[root@ceph01-server ~]#
[root@ceph01-server ~]# python --version
Python 2.6.6
[root@ceph01-server ~]# pip freeze
Cheetah==2.4.1
Markdown==2.0.1
PyYAML==3.10
Pygments==1.1.1
argparse==1.2.1
backports.ssl-match-hostname==3.4.0.2
boto==2.32.1
ceph-deploy==1.5.17
chardet==2.0.1
cloud-init==0.7.4
configobj==4.6.0
distribute==0.7.3
heat-cfntools==1.2.6
iniparse==0.3.1
jsonpatch==1.2
jsonpointer==1.0
ordereddict==1.1
policycoreutils-default-encoding==0.1
prettytable==0.7.2
psutil==0.6.1
pycurl==7.19.0
pygpgme==0.1
requests==1.1.0
setools==1.0
six==1.7.3
urlgrabber==3.9.1
urllib3==1.5
yum-metadata-parser==1.1.2
[root@ceph01-server ~]#