Install either `psycopg2-binary` or `psycopg2` but not both

[cpeel]

psycopg2-binary is a binary distribution of psycopg2 -- there's no need to install both of them.

The official docs say that the non-binary version is the better one for production systems, but requires more system packages for pip to be able to compile the package.

[eshellman]

I needed the binary somewhere, didn't think it was worth the time to figure out what I needed where. Maybe the non-binary needed sudo.

[cpeel]

Usually you want the binary on a platform where it's a pain in the ass to compile, like macOS. In which case it's best to specify that in the file using platform specifiers:

psycopg2-binary = {version = "*", sys_platform = "== 'darwin'"}
psycopg2 = {version = "*", sys_platform = "!= 'darwin'"}

[eshellman]

these configs probably belong in libgutenberg