Python: using simply python script to test Oracle connectivity

import cx_Oracle
sql="select * from vpx_version"

conn = cx_Oracle.connect('vcadmin/password@orcl')

cursor = conn.cursor()
cursor.execute(sql)
print conn.version
print ()
#for result in cursor:
#    print result
res=cursor.fetchmany(numRows=3)
print res
conn.close