why I have the error of “ImportError: No module named form_checker”? when I try to" from form_checker import validation " as the tutorial shown .
If you are importing the module from another project (I’m guessing you are unless you have cut/paste the code) then you have to add it as a dependency.
Click the “gear” icon in the project manager and you’ll see the menu option in there.
In the “Use other apps as libraries” section you want to choose the dependency app. Once done, you can then import as normal in your code.
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Got that! I though the module of validation is public, so I have to code one by myself.
There are no public apps as such.
You have to clone the project so it becomes “your” app in your account (your own fork, if you like). This is true of all example projects.