When I published Lambda that is called regularly like a cron task someone asked me how much would it cost (a fair question taking into account you pay per use, not per infrastructure). With lambda you pay for two things: a request/invocation and the time times memory used.
Are you having problems with packaging your dependencies for a Lambda? You've done the AWS lambda python tutorials but now need to deal with something more complex? Do you just want to build a package to upload in the console or with terraform?