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I don't have (and do not wish to have) python3 installed. I want to install pyqt5 just for python2. However every time I try to install pyqt5 with homebrew it keeps downloading python3 and trying to install it

Even using brew install pyqt5 --without-python which I would assume is an option created for this exact purpose, just produces exactly the same behaviour and starts downloading python3.

Any ideas? Any help would be appreciated!

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Ugh, of course after trying to fix this for ages, I find the problem 5 min after posting this Q!

For anyone else who runs into this: The problem was that I didn't have sip, which is a requirement, and sip automatically installs for both versions of python too, and so it was sip trying to install python3. sip has its own version of --without-python, but that didn't get passed to it from the pyqt5 install.

tl;dr - install sip separately first:

brew install sip --without-python

brew install pyqt5 --without-python

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