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background
I .venv-python3.8-testVideoEncodePychanged the name of the parent directory of my ubuntu20.04 venv virtual environment, and then I used source .venv-python3.8-testVideoEncodePy/bin/activate, execute python3 test.py, and it prompted ModuleNotFoundError: No module named 'cv2'that my cv2 is clearly here: .venv-python3.8-testVideoEncodePy/lib/python3.8/site-packages/cv2/:
explain
This may be because you changed the name of the parent directory where the venv virtual environment is located, and the Python module search path (sys.path) was not updated, causing it to not find the cv2 module.
First, Python's import statement looks for directories in the sys.path list when it works. This list usually includes the current directory, system-installed libraries, and third-party libraries (such as your virtual environment). When you change the location of the virtual environment (by changing its parent directory name), Python may not be able to find the correct path in the sys.path list and thus cannot find cv2.
Solution
Method 1: python3 -m venv xxxRecreate the virtual environment with
One way to solve this problem is to recreate the virtual environment:
- First, deactivate the current virtual environment:
deactivate - Then, recreate the virtual environment in the new directory:
python3 -m venv .venv-python3.8-testVideoEncodePy
- Activate the new virtual environment:
source .venv-python3.8-testVideoEncodePy/bin/activate
- Test:
I directly re-created the virtual environment without exiting:
Then I exited the virtual environment, entered the virtual environment again, and ran the program. I can run directly:
In this way, if you python3 -m venv xxxcreate an existing virtual environment with the same name, you may only rebuild sys.path without clearing the libraries that have been installed in the previous virtual environment. not bad. . .
Method 2: Adjust sys.path
Another possible solution is to directly adjust sys.path so that it contains the correct path. However, this approach needs to be used with caution as it can cause other problems if sys.path is modified incorrectly. Generally speaking, re-creating the virtual environment is a more reliable method.
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