Property Handler cannot be empty - The following resource(s) failed to create - aws-cloudformation

Question

Am trying to create lamda function using cloudformation. While creating stack am getting error like below. I have pasted my template below. Please help me where am doing mistake.
**20:01:50 UTC+0550 ROLLBACK_IN_PROGRESS AWS::CloudFormation::Stack MyStack The
following resource(s) failed to create: [Lamdafuntion]. . Rollback
requested by user.
20:01:50
UTC+0550 CREATE_FAILED AWS::Lambda::Function Lamdafuntion Property
Handler cannot be empty.**
Template :
"Type": "AWS::Lambda::Function",
"Properties": {
"Description" : "Lambda Function",
"Code" : {
"S3Bucket" : "awstier1bucket"
"S3Key" : "code.py.zip"
},
"FunctionName" : lambda_function
"Handler" : "test.lambda_handler",
"Tags": [
{
"Key": "Name",
"Value": "LambdaTest"
}
]

Answer 1

I believe it's due to mismatch of function and handler name.
Generally it has to be constructed by combining file_name.function_name
I've tried the following and it worked:
{
"AWSTemplateFormatVersion": "2010-09-09",
"Description": "yeye",
"Resources": {
"my-resource-1": {
"Type": "AWS::Lambda::Function",
"Properties": {
"Description": "Lambda Function",
"Role": "arn:aws:iam::account_number:role/lambda_basic_execution",
"Runtime": "python2.7",
"Code": {
"S3Bucket": "my_bucket",
"S3Key": "**lambda_script**.py.zip"
},
"FunctionName": "my_function",
"Handler": "**lambda_script.function_name**"
}
}
}
}
In the example above I am uploading file named lambda_script.py which contains code with the following function defined:
def function_name(event, context):
"""
code
more code
"""
Which makes handler name lambda_script.function_name