Jupyter Notebook cell ?

[flaviu2]

Sorry for this trivial question. I have read in some Python tutorial how to "import" OpenCV in Python: OpenCV can be installed through pip, by running the following in a Jupyter Notebook cell:
!pip install --upgrade opencv-python

Where can I find "Jupyter Notebook cell" ?
I have installed Python in VS2017 where I worked on. Of course, I have tried this command in my Python test app from VS2017 (not worked) and in Python cmd line: !pip install --upgrade opencv-python.

Thank you.

[scidam]

Did you run jupyter notebook? Just use the same command without exclamation sign: run in command line: pip install --upgrade opencv-python.

[perfringo]

Where can I find "Jupyter Notebook cell" ?

Quite obviously you can find one in Jupyter Notebook. Do you have trouble starting/opening Jupiter Notebook?

[flaviu2]

Where can I find "Jupyter Notebook cell" ?

Quite obviously you can find one in Jupyter Notebook. Do you have trouble starting/opening Jupiter Notebook?

Yes, I cannot install Jupiter Notebook. According with this sites:
https://jupyter.org/install.html
https://jupyterlab.readthedocs.io/en/sta...ation.html

I have tried all those commands, nothing worked. I ran that command in my Opera browser:
pip install --upgrade opencv-python

result:
Downloading opencv_python-4.4.0.44-cp36-cp36m-manylinux2014_x86_64.whl (49.5 MB)
|████████████████████████████████| 49.5 MB 2.1 MB/s eta 0:00:01 |██████████████████▉ | 29.2 MB 3.2 MB/s eta 0:00:07
Requirement already satisfied, skipping upgrade: numpy>=1.13.3 in /srv/conda/envs/notebook/lib/python3.6/site-packages (from opencv-python) (1.19.1)
Installing collected packages: opencv-python
Successfully installed opencv-python-4.4.0.44
Note: you may need to restart the kernel to use updated packages.

But is not enough to do these on browser ... I guess.
If I ran "import cv2" in my Python program, I got:

No module named 'cv2'
Stack trace:
> File "D:\Tempx\pythonapplication1\pythonapplication1.py", line 174, in <module>
> import cv2
Loaded '__main__'
The program 'python.exe' has exited with code -1 (0xffffffff).

---

Quite obviously you can find one in Jupyter Notebook. Do you have trouble starting/opening Jupiter Notebook?

Yes, I cannot install Jupiter Notebook. According with this sites:
https://jupyter.org/install.html
https://jupyterlab.readthedocs.io/en/sta...ation.html

I have tried all those commands, nothing worked. I ran that command in my Opera browser:
pip install --upgrade opencv-python

result:
Downloading opencv_python-4.4.0.44-cp36-cp36m-manylinux2014_x86_64.whl (49.5 MB)
|████████████████████████████████| 49.5 MB 2.1 MB/s eta 0:00:01 |██████████████████▉ | 29.2 MB 3.2 MB/s eta 0:00:07
Requirement already satisfied, skipping upgrade: numpy>=1.13.3 in /srv/conda/envs/notebook/lib/python3.6/site-packages (from opencv-python) (1.19.1)
Installing collected packages: opencv-python
Successfully installed opencv-python-4.4.0.44
Note: you may need to restart the kernel to use updated packages.

But is not enough to do these on browser ... I guess.
If I ran "import cv2" in my Python program, I got:

No module named 'cv2'
Stack trace:
> File "D:\Tempx\pythonapplication1\pythonapplication1.py", line 174, in <module>
> import cv2
Loaded '__main__'
The program 'python.exe' has exited with code -1 (0xffffffff).

In the help I read: "JupyterLab can be installed using conda, pip, pipenv or docker"
I presume that I must have someting from those app installed. What any of them is smaller and less resource hungry ?

[snippsat]

In the help I read: "JupyterLab can be installed using conda, pip, pipenv or docker"
I presume that I must have someting from those app installed. What any of them is smaller and less resource hungry ?

It seems liker you struggle with basic installing and understanding of this.

/srv/conda/envs/notebook/lib/python3.6/site-packages (from opencv-python) (1.19.1)

Now do install to a virtual environment made bye Anaconda,are you aware of this and how it woks?
Do you have installed Anacaona yourself?

Downloading opencv_python-4.4.0.44-cp36-cp36m-manylinux2014_x86_64.whl (49.5 MB)

You are on Windows,are you using Docker?
It's a little strange that it download a Linux wheel manylinux2014.

---

You can choose to have a version from python.org or Anaconda(large a lot packages is pre-install as,opencv,Jupyterlab,matplotlib...ect and 700 more).
Can also have both install as i have no problem,just have to understand how each is used.

Let say you follow this Python 3.8 (3.6-3.7) and pip installation under Windows
On PyPi opencv-python 4.2.0.34,so from cmd it shall work like this.

# Python interpreter you point to in Editor
C:\>python -c "import sys; print(sys.executable)"
C:\python38\python.exe

# Test pip
C:\>pip -V
pip 20.1.1 from c:\python38\lib\site-packages\pip (python 3.8)

# Install
C:\>pip install opencv-python
Collecting opencv-python
  Downloading opencv_python-4.2.0.34-cp38-cp38-win_amd64.whl (33.1 MB)
     |████████████████████████████████| 33.1 MB 6.8 MB/s
Collecting numpy>=1.17.3
  Using cached numpy-1.19.0-cp38-cp38-win_amd64.whl (13.0 MB)
Installing collected packages: numpy, opencv-python
Successfully installed numpy-1.19.0 opencv-python-4.2.0.34

# Test that it works
C:\>python
>>> import cv2
>>> 
>>> cv2.__version__
'4.2.0'

Now can example install JupyterLab a better Notebook version than standard Jupyter version.

I have installed Python in VS2017

Very fem that use Python use VS21017,a lot use VS code which is a editor the much more geared against Python.
VS Code from start

[flaviu2]

I have succeeded, seem I didn't installed PIP when I installed Python (I didn't knew what it was). I have a little question tough: how can uninstall those whl files at a future time ? I mean, when didn't need it anymore ...

[mysqlguider]

Hey, I had a similar issue when I was trying to install OpenCV using the !pip install command in Visual Studio. The !pip install command works inside Jupyter Notebooks, not directly in the Python shell or in Visual Studio. In Jupyter Notebook, you run code inside cells, which is why the !pip install command works there.

I was a bit confused too when I tried to execute it in my Python test app from VS2017, but it didn't work. It seems like Visual Studio isn't set up to run shell commands like Jupyter Notebooks do.

If you want to work with OpenCV and use !pip install, I'd recommend setting up JupyterLab on your Ubuntu system. JupyterLab gives you a much more flexible environment for running and testing code, including shell commands. It’s a great way to experiment with Python libraries interactively.

You can follow a detailed guide to install JupyterLab on Ubuntu here: Install JupyterLab on Ubuntu.

Once you have JupyterLab installed, you’ll be able to run the !pip install --upgrade opencv-python command directly in the notebook cells, and it should work perfectly.

Hope this helps!