How fix Python Error using Boto3

Question

Hi
I have a Lambda function using a python script that runs a CLI query and send an email with result.
I have two parts working separately but when I combine them it fails as show below.
Do you know how it can be fixed?

```
#!/usr/bin/env python3
from boto3 import client
client = client('rds')

def lambda_handler(event, context):

rds_instances = client.describe_db_instances(Filters=[{'Name':'engine', 'Values':['oracle-ee']}])

#print out just the number of instances
    print(len(rds_instances['DBInstances']))

#print out the engine
    if len(rds_instances['DBInstances']) != 0:
        for db_instance in rds_instances['DBInstances']:
            db_engine = db_instance.get('Engine')
            print(db_engine)

#Send email for result. This is where code fails after adding this section.
    ses_client = client("ses")
    subject = "Report"
    body = "Need to add the output of two print statements above with a title for each"
    message = {"Subject": {"Data":subject}, "Body":{"Html":{"Data": body}}}
    response = ses_client.send_email(Source = "mike10@gmail.com", 
                         Destination={"ToAddresses": ["mike10@gmail.com"]},
                         Message = message)
    return response
```
Test Event Name
RDS-Event

Response
{
  "errorMessage": "'RDS' object is not callable",
  "errorType": "TypeError",
  "requestId": "111907e9-371b-4836-b78d-3364aaa51598",
  "stackTrace": [
    "  File "/var/task/lambda_function.py", line 23, in lambda_handler
    ses_client = client("ses")
"
  ]
}

Function Logs
START RequestId: 111907e9-371b-4836-b78d-3364aaa51598 Version: $LATEST
1
oracle-ee
[ERROR] TypeError: 'RDS' object is not callable
Traceback (most recent call last):
  File "/var/task/lambda_function.py", line 23, in lambda_handler
    ses_client = client("ses")END RequestId: 111907e9-371b-4836-b78d-3364aaa51598
REPORT RequestId: 111907e9-371b-4836-b78d-3364aaa51598	Duration: 729.27 ms	Billed Duration: 730 ms	Memory Size: 128 MB	Max Memory Used: 78 MB	Init Duration: 431.14 ms

Request ID
111907e9-371b-4836-b78d-3364aaa51598

Accepted Answer

Hello.

Please change the code as below.  
The change is "rds_client = client('rds')" on the third line.  
It's happening because a variable named client is already used in boto3's client function to create an RDS client.  
So, setting different variable names for RDS client and SES client will resolve the error.  
```
#!/usr/bin/env python3
from boto3 import client
rds_client = client('rds')

def lambda_handler(event, context):

rds_instances = rds_client.describe_db_instances(Filters=[{'Name':'engine', 'Values':['oracle-ee']}])

#print out just the number of instances
    print(len(rds_instances['DBInstances']))

#print out the engine
    if len(rds_instances['DBInstances']) != 0:
        for db_instance in rds_instances['DBInstances']:
            db_engine = db_instance.get('Engine')
            print(db_engine)

#Send email for result. This is where code fails after adding this section.
    ses_client = client("ses")
    subject = "Report"
    body = "Need to add the output of two print statements above with a title for each"
    message = {"Subject": {"Data":subject}, "Body":{"Html":{"Data": body}}}
    response = ses_client.send_email(Source = "mike10@gmail.com", 
                         Destination={"ToAddresses": ["mike10@gmail.com"]},
                         Message = message)
    return response
```

How fix Python Error using Boto3

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