如何在Python中作为变量返回列表，在Jinja2中使用列表?

I am a very young programmer and I am trying to do something in Python but I'm stuck. I have a list of users in Couchdb (using python couchdb library & Flask framework) who have a username (which is the _id) and email. I want to use the list of email addresses in a select box in a jinja2 template.I am a very young programmer and I am trying to