API 'QString' has already been set to version 1 on Eclipse

Question

I'm getting following error on starting debug session in Eclipse for my code which uses Enthought Mayavi and PyQt as well. Here is the error log in the console.

pydev debugger: starting (pid: 2208)
Traceback (most recent call last):
  File "D:\eclipse\plugins\org.python.pydev_3.7.1.201409021729\pysrc\pydevd.py",
line 2090, in debugger.run(setup['file'], None, None) File "D:\eclipse\plugins\org.python.pydev_3.7.1.201409021729\pysrc\pydevd.py", line 1547, in run pydev_imports.execfile(file, globals, locals) # execute the script File "D:\src\Candls_PyQt\src\application.py", line 10, in sip.setapi("QString",2) ValueError: API 'QString' has already been set to version 1

Here is my code snippet.

from traits.etsconfig.api import ETSConfig
ETSConfig.toolkit = 'qt4'

import sip
sip.setapi("QString",2) 
sip.setapi("QVariant",2)
from PyQt4 import QtCore, QtGui, uic

Are you sure that your very first line does not result in any `PyQt4` import somewhere? That's usually the case - `setapi` calls must happen before any PyQt import. — sebastian, Sep 24 '14 at 07:46
I don't know eclipse, but are you running your code in pylab mode? That would set the GUI backend before your snippet ran. — Jonathan March, Sep 24 '14 at 15:25

score 1 · Answer 1 · answered Sep 25 '14 at 01:50

This was an issue introduced in the latest version of the debugger.

The bug in PyDev is: https://sw-brainwy.rhcloud.com/tracker/PyDev/452 (it was fixed already but it's still not in a released version).

A workaround for now would be manually applying the fix: https://github.com/fabioz/Pydev/commit/af39f23bc884e9514aaaeede7b6e77e22b6823f6 in your local version of pydev_monkey_qt.py (inside eclipse/plugins/org.python.pydev/pysrc)

API 'QString' has already been set to version 1 on Eclipse

1 Answers1