The package I downloaded was wxPython3.0-osx-cocoa-py2.7.dmg from https://sourceforge.net/projects/wxpython. I clicked on the file but got the following message at the end of the failed installation:
The Installer could not install the software because there was no software found to install.
I followed the steps by memoselyk on Install wxPython in osx 10.11 but got the following message after calling the command in step 3 in the Terminal:
pkgbuild: error: output path "wxPython3.0-osx-cocoa-py2.7.pkg" is a directory; specify a path to the package to be written.
Does anyone know how to fix this?