client = MongoClient('localhost',27017)
db = client[DB_NAME]

def db_connect():
    #connecting to a DB in mongoDB
    try:
        if client.get_database(DB_NAME):
            print("Connection Successful!")
            return True
    except:
        print("Please check your connection")
        return False

def db_close():
    print ("Connection Getting Closed")
    client.close()

I am trying to achieve a task, only if the connection exists by pymongo, then return True so that the functions can proceed, else it should return False and a message to check connection. So that we don't proceed further.

How can I achieve this?

EDIT 1 : Accepted Solution

Successfully added user: {
"user" : "ash",
"roles" : [
    {
        "role" : "readWrite",
        "db" : "myDB"
    },
    "clusterAdmin"
]

}

I added a user using the above code snippet and then used the following script.

DB_NAME = "myDB"
client = MongoClient('localhost',27017)
db = client[DB_NAME]
def db_connect():
    #connecting to a DB in mongoDB
    try:
        if db.authenticate("ash","password"):
            print("Connection Successful!")
            return True
    except:
        print("Please check your connection")
        return False

def db_close():
    print ("Connection Getting Closed")
    client.close()

if __name__ == "__main__":
    db_connect()
    db_close()

I have used this code snippet to connect to my DB Now getting connected to the DB I have the database in my PC and I am using Ubuntu 16.04.