'pip freeze not showing package

For some reason I can't see opencv printing via pip freeze, however I can import it.

pip freeze | grep opencv
pip3 freeze | grep opencv

python -c "import cv2; print(cv2.__file__)"
/usr/local/lib/python3.6/dist-packages/cv2.cpython-36m-x86_64-linux-gnu.so
python -c "import cv2; print(cv2.__version__)"
3.4.2

python3 -c "import cv2; print(cv2.__file__)"
/usr/local/lib/python3.6/dist-packages/cv2.cpython-36m-x86_64-linux-gnu.so
python3 -c "import cv2; print(cv2.__version__)"
3.4.2

python -V
Python 3.6.8

python3 -V
Python 3.6.8

pip -V
pip 9.0.1 from /usr/lib/python3/dist-packages (python 3.6)

pip3 -V
pip 9.0.1 from /usr/lib/python3/dist-packages (python 3.6)

I have alias for python3 in bashrc:

cat ~/.bashrc | tail
alias python=python3
alias pip=pip3

Ubuntu version:

lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 18.04.2 LTS
Release:    18.04
Codename:   bionic
pythonpython-3.xopencvubuntupip


Solution 1:[1]

When you freeze the packages by pip, it will show the packages installed by pip and opencv may not be installed through pip.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Lamanus

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