Error while executing Python script on AWS Lambda function

Question

I am attempting to use the following Lambda Function on AWS to automatically import objects from an S3 bucket into an RDS instance as they are uploaded into the bucket.

import boto3
import pymysql

s3_cient = boto3.client('s3')

# Read CSV file content from S3 bucket
def read_data_from_s3(event):
    bucket_name = event["Records"][0]["s3"]["bucket"]["name"]
    s3_file_name = event["Records"][0]["s3"]["object"]["key"]
    resp = s3_cient.get_object(Bucket="bucket_name", Key=s3_file_name)

    data = resp['Body'].read().decode('utf-8')
    data = data.split("\n")
    return data

def lambda_handler(event, context):
    rds_endpoint  = "rds-endpoint"
    username = "name"
    password = "pass" # RDS Mysql password
    db_name = "db-name" # RDS MySQL DB name
    conn = None
    try:
        conn = pymysql.connect(rds_endpoint, user=username, passwd=password, db=db_name, connect_timeout=5)
    except pymysql.MySQLError as e:
        print("ERROR: Unexpected error: Could not connect to MySQL instance.")

    try:
        cur = conn.cursor()
        cur.execute("INSERT INTO `db`.`table`(`sensor`,`sIP`,`dIP`,`sPort`) VALUES(<{sensor: }>,<{sIP: }>,<{dIP: }>,<{sPort: }>);")
        conn.commit()
    except:
        pass

    data = read_data_from_s3(event)

    with conn.cursor() as cur:
        for ent in data: # Iterate over S3 csv file content and insert into MySQL database
            try:
                ent = ent.replace("\n","").split(",")
                print (">>>>>>>"+str(ent))
                cur.execute('insert into db`.`table (sensor,Sip,Dip,sPort) values("'+str(ent[1])+'")')
                conn.commit()
            except:
                continue
        cur.execute("select * from table")
       
        # Display table records
        for row in cur:
            print (row)
    if conn:
        conn.commit()

Whenever I run this, I get the following error and I do not understand what I am doing wrong? Would someone be able to clarify my errors?

[ERROR] TypeError: __init__() takes 1 positional argument but 2 positional arguments (and 4 keyword-only arguments) were given
Traceback (most recent call last):
  File "/var/task/lambda_function.py", line 23, in lambda_handler
    conn = pymysql.connect(rds_endpoint, user=username, passwd=password, db=db_name, connect_timeout=5)

Answer 1

It seems that pymysql.connect only takes in keyword arguments. You are passing rds_endpoint in as a positional argument. The rds_endpoint argument should probably passed in as host=rds_endpoint .