The iPython 2 console and notebook as well as the iPython 3 console work fine on my system.
But running ipython3 notebook gives an ImportError saying No module named 'IPython.frontend.html' and this traceback.
I think it may have something to do with Ubuntu RR package problems, but I'm not sure.
10x.
Ubuntu split the notebook functionality away form the main ipython3 package into ipython3-notebook in Raring.
Now installing ipython3 should install ipython3-notebook for you automatically as it recommends it; but when I had this problem, Raring critically depended on a package of python3 too high for python3-zmq which was depended on by ipython3-notebook causing ipython3-notebook' to not be installed (which I did not notice). Whew...
This might be due to the fact that the package layout has been change and IPython.frontend.html is now IPython.html do you have dev version installed by any chance ?
I had this problem and fixed it by upgrading ipython (using --upgrade)
Related
I have just installed pycharm 2019 edition. I have already installed python 3.7 in my system. My normal python program in pycharm is running fine i.e. printing hello world but I am not able to install packages like pandas and all. its showing error. 2nd thing i am not able to see latest version of pip that is been shown in pycharm.
I have tried to do this with some changes in manage repositories but It didn't wokred
While clicking on pip its showing "Error loading package list:pypi.python.org" this error message.
I want to install packages but cant able to do it.
Please download Anaconda Distribution, which is basically made for pandas and all. You can use Spyder which is one of the best tools for Data Science. There you can easily install pandas.
I'm having an error running simple code using cv2 module.
It's just:
import cv2
img = cv2.imread('sudoku.png',0)
cv2.imshow('image',img)
And it fails with the following error:
QObject::moveToThread: Current thread (0x1b74720) is not the object's thread (0x1e57d70).
Cannot move to target thread (0x1b74720)
I googled this error and tried a lot of things but it doesn't help. I tried installing without pip, I tried using step-by-step installation (from official OpenCV) but nothing helps.
When I run:
cv2.__version__
It returns 3.4.3
As noted already, the basis for this problem is discussed in opencv-python issue 46, and results from the duplication of the following libraries both on the host and the opencv-python distro libQtDBus libQtCore and libQtGui.
It has been lately addressed in the newest release of opencv-python. It is not a fix to the source code, rather the fix is to force pip to compile the newly available source via
pip install --no-binary opencv-python opencv-python
This will cause opencv-python to use the same libraries as the host, so the conflict no longer exists.
According to this issue posted on the OpenCV GitHub, this is a known issue that the developer states is damn near impossible to fix. It is apparently caused by a conflict in any Qt installations on the system with the Qt that is shipped with OpenCV. There are some suggestions floating around to remove the libqt5x11extras5 package from the system. This may fix it for some but anyone running these libraries on a Linux distribution that uses a window manager based on Qt will render their desktop environment unusable by removing this package (having tried it myself).
You can try building OpenCV from source using the WITH_GTK=ON option when running cmake which will use GTK instead of Qt, circumventing the conflict. However, this is hard to make use of in Python when using virtual environments.
I haven't spent the time to fully appreciate this problem, but as I understand this is caused by multiple conflicting versions of some plugin in the environment. I tried installing building opencv-python but there were errors with that approach. Another suggestion is to change your import order, but I've had mixed success with that, and I couldn't get it to work on a project today.
But I found a workaround that worked for me. Install opencv-python-headless instead of opencv-python. This will avoid installing the conflicting plugins. It may not work for you depending on what features of opencv you need.
$ pip uninstall opencv-python
$ pip install opencv-python-headless
The error was fixed on my system, by simply updating one library.
To find out where it is coming from, assuming Linux, try the following,
LD_DEBUG=files python -c "import cv2"
or,
LD_DEBUG=files python -c "import cv2 ; img = cv2.imread('myimage.png',0) ; cv2.imshow('image',img) ; cv2.waitKey(0)"
On my machine, it failed in one of the blas libraries. I updated that library and the code now runs without error.
This is an old bug you can find it discussed in a number of online communities.
My test code is as follows. Notably the error has not reoccurred, and apparently has nothing to do with Qt.
import cv2
img = cv2.imread('sudoku.png',0)
cv2.imshow('image',img)
cv2.waitKey(0)
To me, the solution to this problem was removing Anaconda, then installing pip followed by installing OpenCV with a simple pip install command.
Running: Ubuntu 16.04 and Python 3.5.2
So I ran a script which I found here: https://github.com/rferrazz/pyqt4topyqt5
in order to convert one of my projects built in PyQt4 into a PyQt5 project.
I ran the script and the conversion was made just fine with no errors. Essentially, everywhere QtGui() was used was changed to QtWidgets(). The only problem, when I try to run the new PyQt5 project I get the following error:
ImportError: /usr/local/lib/python3.5/dist-packages/PyQt5/QtGui.so: undefined symbol: PySlice_AdjustIndices
I am not positive but it seemed to me this would be a version error of some kind, which brings me to my questions. Is there a method of updating Python from 3.5 to the newest version release which I believe is 3.7 from the command prompt? Also, is the ImportError I got a version control issue like I believe it to be?
The solution to this problem ended up being a version problem from what I can tell. I installed py3.7 from source using pyenv, drove the script with that interpreter through PyCharm and was able to run it.
I can say I am quite new to the world of Python but not to programming. I have been using PyCharm over the last year and I got Python conda distribution to make my life easier with package management.
Lately, I have been trying to play with a package known PuLP which was not available to download via conda but I installed using pip. I realized that although PyCharm recognizes pulp when running my code, it is not in the available packages and I am not sure that the same version of PuLP is used in and out of PyCharm. Specifically, when I run the pulpTestAll command that looks for installed solvers from my terminal, the recognized solvers are different than those recognized when I run exactly the same script within PyCharm.
Can someone give me a tip on how to fix this?
How do I import modules in pycharm?
You may look here. Maybe you have to specify an interpreter for the Conda environment. To do that when you are choosing an interpreter at the right there is a gear at the right. After you press it, you may add a new interpreter and you can choose Conda Environment.
In order to run an optimization problem we set up Gurobi 6.0.4 together with
Anaconda (Version 2.2.0) Python (Python 2.7.9.) on
Linux CentOS release 6.6 (Final) with the 2.6.32-504.16.2.el6.x86_64 Kernel
Following the installation guidelines of Gurobi (listed here: http://www.gurobi.com/documentation/6.0/quickstart_linux.pdf)
everything worked out in the first step. Gurobi was installed, could obtain a license. Also the PATH variables have been set (in the .bashrc) according to the manual, with a little extension for the referal to anaconda python (and not the other local Versions of python (being 2.7 and 3.4):
export GUROBI_HOME="/opt/gurobi604/linux64"
export PATH="${PATH}:${GUROBI_HOME}/bin:${PATH}:opt/anaconda/bin"
export LD_LIBRARY_PATH="${LD_LIBRARY_PATH}:${GUROBI_HOME}/lib"
Following the procedure we executed: python2.7 setup.py install in the respective directory /opt/gurobi604/linux64. After this usually you could run the import gurobipy command in the python interpreter wihtout errors. For older Versions of Gurobi (as 5.6.3) this works out very well.
For 6.0.4 though we constantly receive the error:
ImportError: /opt/anaconda/lib/python2.7/site-packages/gurobipy/gurobipy.so: undefined symbol: _Py_FalseStruct
This is very reproducible, no matter if we put anaconda also in the global path, and check the bash for any overwriting of the environment variables, which is not the case.
On Windows 8 the Gurobi 6.0.4 and Anaconda Python 2.2.0 work together without any problems.
Also applying hints from here: Python Module Error on Linux did not work out.
Did anyone else experience these problems with this tooling combination? thx.
The error message indicates that you use the Python module for version 3.4 in your Python 2.7 package directory. This can happen if you do not clean your Python module build directory between builds. Please try the following:
Completely remove the 2.7 package from your Python 2.7 installation (e.g. remove /opt/anaconda/lib/python2.7/site-packages/gurobipy)
Completely remove the Python module build directory from your Gurobi installation (e.g. /opt/gurobi604/linux64/build)
Re-run the build process for the Python 2.7 module (e.g. run "python2 setup.py install" in /opt/gurobi604/linux64)
Please note that CentOS is currently a non-supported platform for Gurobi.
Thank you for the hint, I think we tried that, but did not finish the procedure in this way. We tried to clean the system but in that particular case still hat both python Versions (due to other applications that use 3.4) on the machine. Our solution in this case was just to reinstall everything clean on a Ubuntu 14.04 VM. Since then no further problems occured. (I know not the cleanest solution.)
We had some similar issues when we updated to Gurobi 6.5, but that could be solved when corrctly addressing the usual path issues.
Thank you in any case for the reply, I think this really will help us with the next, then clean deployment :-)