How do I fix PyDev "Undefined variable from import" errors?

For code in your project, the only way is adding a declaration saying that you expected that -- possibly protected by an if False so that it doesn't execute (the static code-analysis only sees what you see, not runtime info -- if you opened that module yourself, you'd have no indication that main was expected).

To overcome this there are some choices:

1. If it is some external module, it's possible to add it to the forced builtins so that PyDev spawns a shell for it to obtain runtime information (see http://pydev.org/manual_101_interpreter.html for details) -- i.e.: mostly, PyDev will import the module in a shell and do a dir(module) and dir on the classes found in the module to present completions and make code analysis.

2. You can use Ctrl+1 (Cmd+1 for Mac) in a line with an error and PyDev will present you an option to add a comment to ignore that error.

3. It's possible to create a stub module and add it to the predefined completions (http://pydev.org/manual_101_interpreter.html also has details on that).

I'm using opencv which relies on binaries etc so I have scripts where every other line has this silly error. Python is a dynamic language so such occasions shouldn't be considered errors.

I removed these errors altogether by going to:

Window -> Preferences -> PyDev -> Editor -> Code Analysis -> Undefined -> Undefined Variable From Import -> Ignore

And that's that.

It may also be, Window -> Preferences -> PyDev -> Editor -> Code Analysis -> Imports -> Import not found -> Ignore

The post marked as answer gives a workaround, not a solution.

This solution works for me:

• Go to Window - Preferences - PyDev - Interpreters - Python Interpreter
• Go to the Forced builtins tab
• Click on New...
• Type the name of the module (multiprocessing in my case) and click OK

Not only will the error messages disappear, the module members will also be recognized.