This sample code is used to connect in Python to Oracle SID.
import jpype
import jaydebeapi
jHome = jpype.getDefaultJVMPath()
jpype.startJVM(jHome, '-Djava.class.path=/path/to/ojdbc6.jar')
conn = jaydebeapi.connect('oracle.jdbc.driver.OracleDriver','jdbc:oracle:thin:user/password@DB_HOST_IP:1521:DB_NAME')
How can we connect to Oracle Service Name?