How do I fix PyDev Undefined variable from import errors

Question

I ve got a Python project using PyDev in Eclipse  and PyDev keeps generating false errors for my code   I have a module settings that defines a settings object   I import that in module b and assign an attribute with   from settings import settings settings main   object     In some of my code--but not all of it  statements like   from settings import settings print settings main        generate  Undefined variable from import  main  messages in the Eclipse code error pane  even though the code runs without a problem   How can I correct these

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It is possible you just need to re-configure your python path within Eclipse   See my answer to a similar question

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My answer doesn t contribute anything new  just a concrete example I encountered   import gtk gdk  w   gtk gdk get default root window     PyDev showed the error message  Undefined variable from import  get default root window     In the python shell you can see that this is a  built-in  module as mentioned in a answer above    gt  gt  gt  import gtk gdk  gt  gt  gt  gtk gdk  lt module  gtk gdk   built-in  gt    Now under Window- Preferences- PyDev- Interpreters- Python Interpreter  I selected the tab  Forced Builtins  and added  gtk gdk  to the list   Now the error message didn t show anymore

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I find that these 2 steps work for me all the time    Confirm  else add  the parent folder of the module to the PYTHONPATH  Add FULL name of the module to forced builtins    The things to note here    Some popular modules install with some parent and child pair having the same name  In these cases you also have to add that parent to PYTHONPATH  in addition to its grandparent folder  which you already confirmed added for everything else  Use  for example   google appengine api memcache  when adding to forced builtins  NOT  memcache  only  where  google  in this example  is an immediate child of a folder defined in PYTHONPATH

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This worked for me   step 1  Removing the interpreter  auto configuring it again  step 2  Window - Preferences - PyDev - Interpreters - Python Interpreter         Go to the Forced builtins tab         Click on New            Type the name of the module  curses in my case  and click OK  step 3  Right click in the project explorer on whichever module is giving    errors  Go to PyDev- Code analysis

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Right click in the project explorer on whichever module is giving errors  Go to PyDev- Remove Error Markers

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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    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  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  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

User · Answer

I was having a similar problem with an Eclipse PyDev project  In this project the root directory of the python code was a sub-directory of the project   -- gt  MyProject    -- gt  src         Root of python code      -- gt  module1     A module       -- gt  module2     Another module    -- gt  docs    -- gt  test   When the project was debugged or run everything was fine as the working directory was set to the correct place  However the PyDev code analysis was failing to find any imports from module1 or module2   Solution was to edit the project properties -  PyDev - PYTHONPATH section and remove  MyProject from the source folders tab and add  MyProject src to it instead

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in preferences --  PyDev --  PyLint under arguments to pass to PyLint add this line   --generated-members objects   you will need to do this for each generated   I found this by googling  but I lost the reference

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An approximation of what I was doing   import module submodule  class MyClass      constant   submodule constant   To which pylint said  E  4 15  Undefined variable  submodule   undefined-variable   I resolved this by changing my import like   from module submodule import CONSTANT  class MyClass      constant   CONSTANT   Note  I also renamed by imported variable to have an uppercase name to reflect its constant nature

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I had the same problem  I am using Python and Eclipse on Windows  The code was running just fine  but eclipse show errors everywhere  After I changed the name of the folder  Lib  to  lib   C  Python27 lib   the problem was solved  It seems that if the capitalization of the letters doesn t match the one in the configuration file  this will sometimes cause problems  but it seems like not always  because the error checking was fine for long time before the problems suddenly appeared for no obvious reason

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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

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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

User · Answer

If you re sure that your script runs and that it is a false alarm  Go to Preferences   PyDev   Editor   Code Analysis  Demote the errors to warnings     http   www pydev org manual adv code analysis html

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

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