until I get to creating the apps. 
                  
                  
                  
                  
                  
                  The tutorial here says this:
                  
                  
                  python setup.py windows -s
                  
                  
                  But when I do that I get an error: invalid command windows. They tell the same for Linux and Mac. 
                  
                  
                  python setup.py macos -s
                  
                  
                  But none of those are valid commands. Have any of you guys had the same issue?
                  
                  
                
did you run: pip install briefcase before?
I hope you've read https://briefcase.readthedocs.io/en/latest/background/getting-started.html before going through the tutorial 😜
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