Not able to access the PDI using python script

[HemantP70979324]

I am using basic auth , username and password which is mentioned on the home page of manage instance but i am still not able to access servicenow Table API using python script 
It is showing 

{

    "error": {

        "message": "User is not authenticated",

        "detail": "Required to provide Auth information"

    },

    "status": "failure"

}