One of the prerequisites is to have a working Module 2 sample app. Use your solution if you completed that tutorial. You can complete it now link above , or if you wish to skip it, then copy the Module 2 repo link below. There are Python 2 and 3 versions of this tutorial, so grab the correct code repo below. If you completed the Module 2 tutorial, you'll also have a lib folder with Flask and its dependencies.
If you don't have a lib folder, create it with the pip install -t lib -r requirements. If you have both Python 2 and 3 installed, we recommend using pip2 instead of pip to avoid confusion with Python 3. Once you've successfully executed those steps and confirm it's operational, we'll move ahead in this tutorial, starting with the configuration files. The only configuration change is a minor package swap in your requirements. Upon completing Module 2, your requirements. Update requirements. Keep in mind that the repo is maintained more regularly than this tutorial, so it's possible the requirements.
We recommend using the latest versions of each library, but if they don't work, you can roll back to an older release. The versions numbers above are the latest when this codelab was last updated. The other configuration files, app. Replace the google. Because the Datastore client library does not support auto-creation of a timestamp field in an Entity, also import the standard library datetime module to create one manually.
By convention, standard library imports go above third-party package imports. When you're done with these changes, it should look like this:. After initializing Flask, the Module 2 sample app creating an NDB data model class and its fields lok as follows:. The Cloud Datastore library does not have such a class, so delete the Visit class declaration.
You still need a client to talk to Datastore, so change ndb. Client to datastore. The Datastore library is more "flexible," allowing you to create Entities without "pre-declaring" their structure like NDB. After this update, this part of main. Migrating to Cloud Datastore requires changing how you create, store, and query Datastore entites at the user-level.
For your applications, the difficulty of this migration depends on how complex your Datastore code is. In our sample app, we attempted to make the update as straightforward as possible. Here is our starting code:. With Cloud Datastore, create a generic entity, identifying grouped objects in your Entity with a "key".
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