[IMP-dev] IMP Homebrew package and Python 3.8

[Ben Webb <>]

Hi all, just FYI I will likely be moving the Homebrew IMP package to 
Python 3.8 in the near future.

The Homebrew folks seem to be having a lot of trouble switching from 
Python 3.7 to 3.8; see 
https://github.com/Homebrew/homebrew-core/issues/47274 which they have 
been working on since November. They gave up on a simple switch and now 
they are migrating formulae individually. Most formulae now use Python 
3.8 but the default (/usr/local/bin/python3) is still 3.7. Since IMP 
uses the default it is increasingly broken since common dependencies 
(numpy, scipy) now only work with 3.8.

If you want to build IMP on a Homebrew Mac against Python 3.8, this is 
pretty easy - just set in bashrc/zshrc
export PATH="/usr/local/opt/python@3.8/bin:$PATH"
as recommended by "brew info python@3.8" to make "python3" be 3.8 and
export CMAKE_FRAMEWORK_PATH="/usr/local/Cellar/python@3.8/3.8.2/Frameworks"
for CMake to pick up 3.8 when you build IMP.

I will likely also adjust the Homebrew IMP package to use Python 3.8 at 
some point in the next few weeks.

	Ben
--
                      https://salilab.org/~ben/
"It is a capital mistake to theorize before one has data."
	- Sir Arthur Conan Doyle