How to validate connection with boto3 in a "if then" situation.

I am not very familiar with coding (...) I am trying to set up a script that validates the connection to an S3 endpoint. The idea is, If the connection is established ( with HTTP return code 200 ), a message will printed telling "Connection is established", and if any other code that 20x ( 40x for instance ), the error message will be written in log file:

       def validation_inputs(self):

       self.credChamploginS3 = self.ChamploginS3.get()
       self.credChampsecretpasseS3 = self.ChampsecretpasseS3.get()
       self.credChampsendpointS3 = self.ChampsendpointS3.get()
       #print(credChamploginS3,credChampsecretpasseS3,credChampsendpointS3)
       s3conn = boto.connect_s3(
       aws_access_key_id = self.credChamploginS3, 
       debug=2,
       aws_secret_access_key = self.credChampsecretpasseS3,
       host = self.credChampsendpointS3,is_secure=False,
       calling_format = boto.s3.connection.OrdinaryCallingFormat(),
       )
       now = datetime.datetime.now()
       if s3conn is None:

           print"log : No S3 Connection, creating a new one. BAD INPUTS" 
           print "time :" + now.strftime("%Y-%m-%d %H:%M")

       else:
               print"log : S3 Connection, validated."
               print "Current date and time using strftime:"
               print now.strftime("%Y-%m-%d %H:%M")
               #self.bucket = self.conn.get_all_buckets() 
               #or key in buckets:
               #print key.name
               listsbuckets = s3conn.get_all_buckets() 

               for bucket in listsbuckets:
                   print "{name}\t{created}".format(name = bucket.name,created = bucket.creation_date)

       #buckets = s3conn.get_all_buckets() 
       #for key in buckets:
       #    print key.name