>>> import cv2
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: No module named cv2
>>>
I installed openCV from here in my root directory. I am not able to use it in my project.
Any suggestions?
Download the latest package from this link
http://opencv.org/downloads.html
Try building and installing opencv from this link.
http://rodrigoberriel.com/2014/10/installing-opencv-3-0-0-on-ubuntu-14-04/
Ahh! finally after all struggle i made it.
This is the fresh start from beginning:
Step 1: Remove previously installed openCV from your system
sudo apt-get autoremove opencv-doc opencv-data libopencv-dev libopencv2.4-java libopencv2.4-jni python-opencv libopencv-core2.4 libopencv-gpu2.4 libopencv-ts2.4 libopencv-photo2.4 libopencv-contrib2.4 libopencv-imgproc2.4 libopencv-superres2.4 libopencv-stitching2.4 libopencv-ocl2.4 libopencv-legacy2.4 libopencv-ml2.4 libopencv-video2.4 libopencv-videostab2.4 libopencv-objdetect2.4 libopencv-calib3d2.4
Step 2: Follow this guide step by step: http://foxrow.com/installing-opencv-in-a-virtualenv/
Related
When I try to use installed packages in Python, I nearly always run into the same error.
So I e.g. install a package like this: pip3 install mathplot and when I afterwards want to use it in Python3 (I use python3 in the command prompt), I run into the ModuleNotFoundError:
>>> import mathplot
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'mathplot'
But when I run just python, the module is found and ready to use.
Any idea where this problem comes from and how I can get rid of it?
Thanks in advance
I am having trouble installing the cdstoolbox-remote on my Linux machine (tried both Ubuntu and Debian). I installed it using pip:
pip install cdstoolbox-remote
Which successfully installs the module, but I can't import the module in Python. Importing the module causes the following error:
>>> import cdstoolbox
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/an/miniconda2/envs/tools/lib/python3.7/site-packages/cdstoolbox/__init__.py",
line 8, in <module>
with open(__main__.__file__) as f:
AttributeError: module '__main__' has no attribute '__file__'
What can be done to get it working?
Do you really need cdstoolbox-remote? The standard API for downloading data from CDS would be cdsapi, which can be installed using
pip install cdsapi
or using conda (https://anaconda.org/conda-forge/cdsapi)
I also just tried installing cdstoolbox-remote and got the same problem. But as it is flagged as experimental I even consider it to be possible that the current version is not a stable version.
And cdsapi seems to work.
Actually, the CDSAPI can also be used to execute workflows as follows:
import cdsapi
c = cdsapi.Client()
with open("workflow.py") as f:
code = f.read()
r = c.workflow(code)
print(c.download(r))
For more, read this thread on the Copernicus services documentation.
So my case is a tricky one.
I first installed OpenCV2.4.8 and started it using for python2.7. Later I planned to migrate to OpenCV3.0.0. Both the times during installation I followed the official documentation procedure. Everything was working fine until I realized that OpenCV3 doesn't have SIFT() and SURF() modules. After a bit of searching I found they are present in opencv_contrib. First I tried to install that but for some reason I couldn't.
Later I found that these modules are present in OpenCV2.4.11 and planned to install that. Again following the official procedure I installed OpenCV2.4.11 got the same SIFT() importerror. Upon checking the OpenCV __version__ in python2 and python3 I found the following
python2: "2.4.8"
python3: "3.0.0"
For checking the version I used the following code:
from cv2 import __version__
print(__version__)
Unfortunately I don't have a lot of memory in /home, so I had deleted OpenCV2.4.8 and OpenCV3.0.0 build folders after installing. Therefore, I tried to manually remove OpenCV2.4.8 and OpenCV3.0.0 and deleted all opencv the libs from /usr/local/libs/ and sub-directories and all the opencv bins from /usr/local/bins/ (following answer in this question).
After removing all opencv files I again reinstalled OpenCV2.4.11 and tried to run my code. It failed at the import step in python2 giving
>>> import cv2
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: libopencv_core.so.2.4: cannot open shared object file: No such file or directory
in python3
>>> import cv2
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: libopencv_core.so.3.0: cannot open shared object file: No such file or directory
I again checked if OpenCV2.4.11 is present or not and its there but the python hasn't updated the previously stored link to opencv lib. I'm stuck at this error since 2 days with no solution. Any help will be appreciated.
EDIT:
Is there some shared library lookup file which python uses to store all the locations of shared libraries? If not how does this work (how python recognizes where to look for opencv as opencv is not listed in pip freeze)
EDIT2:
I found another mistake. I hadn't enabled -D BUILD_SHARED_LIBS=ON before. This time I kept it ON and rand sudo ldconfig after make and make install. Now I have a libopencv_core.so.2.4 in my /usr/local/lib/. It is a symlink to libopencv_core.so.2.4.11 present in the same folder. After ldconfig when I checked for python2 import cv2 didn't show any error but __version__ still shows '2.4.8'. I double checked for any OpenCV2.4.8 .so file and there are none. How is it still pointing to version '2.4.8'?
Steps for removal:
remove opencv libs by : sudo apt-get purge libopencv*
Verify that whether cv2 is uninstalled by trying import cv2 in python. It should show no cv2 module present
Install opencv2.4.11 by following this sh file
Run sudo ldconfig after sudo make install
Things should usually work but it didn't work in my case because cv2.so was missing from /usr/local/lib/python2.7/dist-packages/. For that manually copy from /<opencv-2.4.11 unzip locaiton>/release/lib/cv2.so to /usr/local/lib/python2.7/dist-packages/. Use sudo for permissions.
Now import cv2 will work and __version__ is '2.4.11'.
I'm using Ubuntu 14.04. While I have to retain my "main" python install as 2.7.6, I need to install 2.7.9 to be able to use ssl.SSLContext, to get Flask to deal with HTTPS requests.
However, if I just do:
sudo make install
or
sudo make altinstall
in the Python-2.7.9 directory, I ultimately get:
make: *** [libinstall] Error 1
EDIT: this appears at the end of sudo make install:
...
Compiling /usr/local/lib/python2.7/xml/sax/saxutils.py ...
Compiling /usr/local/lib/python2.7/xml/sax/xmlreader.py ...
Compiling /usr/local/lib/python2.7/xmllib.py ...
Compiling /usr/local/lib/python2.7/xmlrpclib.py ...
Compiling /usr/local/lib/python2.7/zipfile.py ...
make: *** [libinstall] Error 1
So I installed it to a custom directory by modifying the call to ./config, which did not yield the libinstall error.
However, when I try to import Tkinter into Python 2.7.9 (running from the custom directory) I obtain:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/repos/Python279/lib/python2.7/lib-tk/Tkinter.py", line 39, in <module>
import _tkinter # If this fails your Python may not be configured for Tk
ImportError: No module named _tkinter
If I just go ahead and install the vanilla way (i.e., to a non-custom directory) and simply ignore the libinstall error I get, upon importing Tkinter:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python2.7/lib-tk/Tkinter.py", line 39, in <module>
import _tkinter # If this fails your Python may not be configured for Tk
ImportError: /usr/lib/python2.7/lib-dynload/_tkinter.so: undefined symbol: PyFPE_jbuf
Does anyone have any idea what is going on?
Following furas' suggestion, installing via the
Python 2.7 PPA maintained be Felix Krull worked spectacularly. Thanks Furas!
EDIT Some notes:
Because this PPA installs python2.7 (specifically v. 2.7.11, as of 1/29/2016), this obviated the need for a custom python install location
While the PPA website mentions that this doesn't include python-tk, provided you have installed it, python plays with it just fine (solving my problem)
First of all source code from a program must be configured, compiled, then installed. You can do this by:
./configure # Or ./config depending on the file name
make
make install
Second of all when you tried to import the module _tkinter you wanted to import the .py file which was called Tkinter.py
Try to use:
import Tkinter
I am on Ubuntu 13.04. I get the following error message -
Traceback (most recent call last):
File "analyse.py", line 1, in <module>
from log import shelve
File "/home/shubham/SMART/TaxiData/log.py", line 27, in <module>
from demo import *
File "/home/shubham/SMART/zones/demo.py", line 5, in <module>
from qgis.core import *
ImportError: No module named qgis.core
Actually, everything was working fine till today morning. I guess this might be due to a package update.
I tried looking around on Google but my search was fruitless. So, I will really appreciate any help or pointers you guys can give :)
Thanks.
I solved the problem by completely removing the installation and using the nightly builds at 'deb http://qgis.org/debian-nightly raring main'.
If you have pip installed you could either try pip search qgis or pip freeze. The latter shows a list of all installed python packages to check if you have the package. Maybe try reinstalling qgis ...
Try sudo apt-get install python-qgis . The package does not appear to be available on PyPI, but it was listed as "python-qgis" in the Ubuntu packages.