Previously ROS was installed in my system which requires opencv for its implementation and now I am using anaconda in which I need to use the opencv library once again. While writing python code import cv2 throws an error module not found.
Is there any way to use that opencv library which ROS installed in anaconda
Although I installed opencv once again using conda.
$conda install -c conda-forge opencv
however opencv-3.3 was installed using above command. Now my python code is showing different import error as shown below:
ImportError Traceback (most recent call last)
<ipython-input-9-6b49ad4d4ca5> in <module>()
1 from random import shuffle
2 import glob
----> 3 import cv2
4 shuffle_data = True # shuffle the addresses before saving
5 hdf5_path = 'dataset.hdf5' # address to where you want to save the hdf5 file
ImportError: /home/kamal/ros_catkin_ws/install_isolated/lib/python2.7/dist-packages/cv2.so: undefined symbol: PyCObject_Type
How can I particularly specify which opencv library to use. What env variables I need to change.
Any help will be appreciated.
uncommenting the line source /home/user/ros_catkin_ws/install_isolated/share/setup.bash in the .bashrc file dosen't help. You also need to remove the extrasys.path added by the ROS environment.
In a python console
import sys
print (sys.path)
you will see multiple paths related to ROS
then remove the unwanted part of the path by
sys.path.remove('unwanted_path')
This will solve the problem but now ROS will not work. To make it work you need to append the removed path again.
If someone has a better approach please answer.
Related
I am a newbie with Python and I am going around in circles over python's inability to find a mod. In jupyter notebook here is what I get:
pip install pypdf2
Requirement already satisfied: pypdf2 in c:\users\stanleydenman\appdata\local\programs\python\python311\lib\site-packages (3.0.1)
Note: you may need to restart the kernel to use updated packages.
import pypdf2
import pypdf2
---------------------------------------------------------------------------
ModuleNotFoundError Traceback (most recent call last)
Cell In[2], line 1
----> 1 import pypdf2
ModuleNotFoundError: No module named 'pypdf2
So python acknowledges pypdf2 is installed, but cannot find it to import it? I
I have installed, and reinstalled python. I selected the option once to have environmental variables set, other times set them myself. Nothing makes a difference.
Environmental variable set as follows:
C:\Users\StanleyDenman\AppData\Local\Programs\Python\Python311\Scripts\site-packages;C:\Users\StanleyDenman\AppData\Local\Programs\Python\Python311\;C:\Users\StanleyDenman\AppData\Local\Microsoft\WindowsApps;C:\Users\StanleyDenman\AppData\Roaming\npm;C:\Users\StanleyDenman\AppData\Local\Microsoft\WindowsApps;C:\Program Files\Tesseract-OCR;
Tried with Anaconda, cmd line, and jupyter notebook. All the same result.
Try pip list to make sure it's installed.
I'm running Ubuntu 18.04LTS:
Firstly, I couldn't install opencv from anaconda on my existing environment (base) as it kept searching for conflicts forever and then getting stuck with an empty window saying "these packages will be modified" while displaying absolutely nothing and with the only choice of pressing the "cancel" button.
I created a new virtual environment named env_opencv and was able to install opencv:
enter image description here
Then, I run a jupyter notebook that imports opencv:
import cv2
import matplotlib.pyplot as plt
import matplotlib.patches as patches
...
And here's what I get:
ModuleNotFoundError Traceback (most recent call last)
<ipython-input-8-31cd2c78c525> in <module>
----> 1 import cv2
2 import matplotlib.pyplot as plt
3 import matplotlib.patches as patches
4
5 from align import AlignDlib
ModuleNotFoundError: No module named 'cv2'
No matter what I tried, including reinstalling opencv directly from the conda prompt, I can't get past this error.
Incidentally, I was able to make it work on Windows 10 going through the Anaconda prompt and using conda. However, my Windows machine doesn't have an nVidia GPU and I can't use it for CNN training, so I really need to make it work on Ubuntu.
Any suggestions would be great. Thank you.
I found a workaround to this issue:
I activate the env_opencv environment from the command line, then I launch jupyter notebook and it works.
Maybe, there is a bug with anaconda-navigator that doesn't seem to switch environments from the GUI?
I have code that requires: import cv2
but get the error message: Exception has occurred: ModuleNotFoundError
No module named 'cv2'
I have seen exactly the same question before, but all the suggestions fail. The question is 6 years old and hence am repeating it.
various failed suggestions:
conda install --channel https://conda.anaconda.org/menpo opencv3
conda install -c menpo opencv
I am using Windows 10 and have python 3.8.1 running.
I have removed cv2 from the code which works without error and resolves the issue.
The link here (at time of writing, version 4.1.2.3) describes the opencv-python package:
opencv-python link
With the following description of cv2 towards the bottom of the page:
It's easier for users to understand opencv-python than cv2 and it makes it easier to find the package with search engines. cv2 (old interface in old OpenCV versions was named as cv) is the name that OpenCV developers chose when they created the binding generators. This is kept as the import name to be consistent with different kind of tutorials around the internet. Changing the import name or behaviour would be also confusing to experienced users who are accustomed to the import cv2.
I'm trying to install fbprophet on my win10 64 bit machine (anaconda). I've followed the instructions here here and here, but I keep getting the same error:
ImportError Traceback (most recent call last)
<ipython-input-1-7dd3504c366f> in <module>
----> 1 import pandas as pd
~\Anaconda3\envs\fbprophet\lib\site-packages\pandas\__init__.py in <module>
15 if missing_dependencies:
16 raise ImportError(
---> 17 "Unable to import required dependencies:\n" + "\n".join(missing_dependencies)
18 )
19 del hard_dependencies, dependency, missing_dependencies
ImportError: Unable to import required dependencies:
numpy:
IMPORTANT: PLEASE READ THIS FOR ADVICE ON HOW TO SOLVE THIS ISSUE!
Importing the numpy c-extensions failed.
- Try uninstalling and reinstalling numpy.
- If you have already done that, then:
1. Check that you expected to use Python3.7 from "C:\Users\Ran\Anaconda3\envs\fbprophet\python.exe",
and that you have no directories in your PATH or PYTHONPATH that can
interfere with the Python and numpy version "1.17.0" you're trying to use.
2. If (1) looks fine, you can open a new issue at
https://github.com/numpy/numpy/issues. Please include details on:
- how you installed Python
- how you installed numpy
- your operating system
- whether or not you have multiple versions of Python installed
- if you built from source, your compiler versions and ideally a build log
- If you're working with a numpy git repository, try `git clean -xdf`
(removes all files not under version control) and rebuild numpy.
Note: this error has many possible causes, so please don't comment on
an existing issue about this - open a new one instead.
Original error was: DLL load failed: The specified module could not be found.
I assume it has something regarding the numpy version, but the version in the virtual environment I've created for fbprophet is as required (1.17). It seems that this evnironment tries to use different version of numpy.
I have numpy installed in my anaconda base and in other virtual environments and there is nothing wrong with it. It happens only when I try to install fbprophet.
UPDATE:
I was able to solve the problem by uninstall numpy (v 1.17) and install instead numpy v1.16
I'm relatively new to python, so please excuse my ignorance on what could be a very easy fix. I am running python 3.6 through the Rodeo IDE, and it has been great, as it is similar to R-Studio (which I am very familiar with). As an aspiring data scientist, I am trying to learn how to fit regression and time series models to data, and all of the tutorials that I have found all say that I need various packages, all of which should be included in the Anaconda library. After downloading and re-downloading Python, Rodeo, and Anaconda, and trying various online fixes, I have been unable to successfully load the scikit-learn and the statsmodels modules.
#here is everything I have tried.
#using pip
! pip install 'statsmodels'
! pip install 'scikit-learn'
! pip install 'sklearn'
I don't get any errors here, and to be honest I'm kind of confused as to what this actually does, but I have seen many people online always suggest that this is a big problem when trying to import modules.
#using import
import sklearn
import statsmodels
from sklearn import datasets
import statsmodels.api as sm
all of the above give me the same error:
import statsmodels.api as sm
ImportError: No module named 'statsmodels'
ImportError: Traceback (most recent call last)
ipython-input-184-6030a6549dc0 in module()
----> 1 import statsmodels.api as sm
ImportError: No module named 'statsmodels'
I have tried to set my working directory to the Anaconda 3 file that has all of the packages and rerunning the above code with no success.
I'm thinking that the most likely problem has to do with my inexperience, and it is probably a simple fix. Is it possible that the IDE is bad or anaconda just doesn't like me?
So keeping all of the above in mind, the question is, how can I import these modules successfully so that I can access their functionality?
Option 1:
After installing packages with pip, try closing and reopening your IDE/Jupyter Notebook and try again.
This is a known bug that Jake VanderPlas outlined here
Option 2:
Don't put quotations around your pip messages.
!pip install -U statsmodels
!pip install scikit-learn
Option 3:
Also are you using Anaconda? If you are, you should already have scikit-learn. If you are trying inside Rodeo, I think you need to set your path inside Rodeo. Open Rodeo and set the Python Path to your fresh anaconda. See here