Building data-driven web apps with Pyramid and SQLAlchemy Transcripts
Chapter: Introducing the Pyramid framework
Lecture: Building block: Configuration

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0:00 Configuration's a super important part of our web app.
0:03 Like I described in the intro to this chapter
0:05 there's certainly behaviors you would like
0:08 to be different in development than in production.
0:12 A real simple is, do you send email notifications to users
0:17 when you take certain actions?
0:18 Well, in production, of course you do that, right?
0:21 I want to reset my password, or I purchased this thing.
0:24 If you're doing testing locally, especially if somebody
0:27 comes to you and says, hey, the site's not working for me,
0:31 I tried this, but this happens, you might want
0:33 to log in as that user and then try that action.
0:37 And obviously you don't want them to get the email.
0:41 The easiest way to do this in Pyramid is to have
0:44 different configuration files, both for development,
0:46 production, test, whatever the various scenarios you have are.
0:50 In fact, when you create a new project,
0:52 it comes with a development.ini and a production.ini,
0:55 and in here we have a bunch of settings
0:58 that Pyramid uses to control itself.
1:00 But we can add other settings just by saying
1:03 key equals value, so db_file=/db/webapp.sqlite,
1:10 API key equals whatever that thing is.
1:12 Notice there's no quotes on the strings,
1:14 they just come back as strings anyway.
1:16 Super easy, we can do that.
1:18 Now how do you get to them in Pyramid?
1:19 Well, we saw that main startup method,
1:22 and the settings being passed in there,
1:24 so that's super easy.
1:25 We go to that again.
1:26 Now we can go to that config and say get us the settings,
1:29 this is a dictionary that has those keys and values.
1:33 So if I want the DB file, I just say configsettings.get,
1:37 and there's just standard Python dictionary access.
1:40 Get me the thing for DB file, get me the API key,
1:44 and off you go.
1:45 And obviously these can be different
1:47 in development and production.