I find myself needing to test whether a package is installed with the release of Julia v1.7 running on Mac with Apple Silicon. One of the packages I normally use is not yet compatible with Apple Silicon, so for now I’m using the python version via PyCall. I’d like my code to handle both scenarios so I need to determine whether the Julia version of the package is installed or not. If not, use the python version. Maybe this is a short term issue but I support having Pkg.installed retained in Pkg.
For me, I can avoid any warning by using
"somepackage" ∈ keys(Pkg.project().dependencies)
instead of:
In this way I avoid the depreciation warning I get otherwise. 
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That no longer works:
isinstalled(Flux) = pkg != "METADATA" && pkg != "REQUIRE" && pkg[1] != '.' && Pkg.cd(isdir, pkg)
isinstalled (generic function with 1 method)
This here helps me alot: How to use Pkg.dependencies() instead of Pkg.installed() - #19 by Ralf_Dietrich
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