What is the effect of using pip to install python packages on anaconda?

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Everything might keep working if you use pip to install vs conda. However, Conda cannot manage dependencies that pip has installed – it cannot upgrade them, or remove them. More importantly, conda will install a package even if its already been installed with pip! Try this test:

conda create -n testenv python=3
conda activate testenv
pip install numpy
conda install scipy

You will see from the third command that conda will want to re-install NumPy, even though it has already been installed with pip. This can cause problems if there are C libraries whose linking is different, or something like that. In general, whenever possible, use conda to install packages into conda environments.

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