This repository has a bug with python dependencies

run yarn
run yarn build
run cdk bootstrap
run sam build -> notice correct python pandas dependency in .aws-sam/build/pickletovizservicePickleToVizHandler68C6D6E2/pandas
run sam local invoke -> notice error Unable to import module 'handler': No module named 'pandas'

Getting started with AWS CDK

This readme is based one a few resources that you should read to fully understand the framework

The cdk.json file tells the CDK Toolkit how to execute your app.

cdk synth --no-staging > template.yaml to create a template.yml file which sam will use to invoke the function
sam local invoke mywidgetserviceWidgetHandlerFAB6825C --event events/get.json --env-vars environment.json fire a local
mywidgetserviceWidgetHandlerFAB6825C is the lambda function reference, you can find it in template.yml
you can define GET/POST/ANY events as json and send them along your local function invocation
if your lambda accesses real ressources (e.g. an S3 bucket), local invocation wont be able to access the real bucket because the local environment variables are just the references in template.yml, not the real urls of AWS resources.
local invocations can therefore only access real existing AWS resources. You need to manually define environment variables to sam like that:

{
  "mywidgetserviceWidgetHandlerFAB6825C": {
    "BUCKET": "real-bucket-url"
  }
}