Microsoft Windows support?

Is Windows 7 and above supported? (What are the prerequisites then?)

When I run pip install toga-demo I get an error:

[BEEWARE] λ pip install toga-demo
Collecting toga-demo
  Downloading toga_demo-0.2.2-py3-none-any.whl
Collecting toga>=0.2.2 (from toga-demo)
  Downloading toga-0.2.2-py3-none-any.whl
Collecting toga-win32; sys_platform == "win32" (from toga>=0.2.2->toga-demo)
  Downloading toga_win32-0.1.2-py2.py3-none-any.whl (54kB)
    100% |################################| 61kB 2.4MB/s
Collecting toga-cassowary (from toga-win32; sys_platform == "win32"->toga>=0.2.2->toga-demo)
  Downloading toga_cassowary-0.1.2-py2.py3-none-any.whl
Collecting cassowary (from toga-cassowary->toga-win32; sys_platform == "win32"->toga>=0.2.2->toga-demo)
  Downloading cassowary-0.5.1-py2.py3-none-any.whl
Installing collected packages: cassowary, toga-cassowary, toga-win32, toga, toga-demo
Exception:
Traceback (most recent call last):
  File "c:\users\my_user_name\envs\beeware\lib\shutil.py", line 538, in move
    os.rename(src, real_dst)
FileExistsError: [WinError 183] Eine Datei kann nicht erstellt werden, wenn sie bereits vorhanden ist: 'c:\\users\\my_user_name\\envs\\beeware\\Lib\\site-packages\\toga_demo-0.2.2.dist-info\\RECORD.pip' -> 'c:\\users\\my_user_name\\envs\\beeware\\Lib\\site-packages\\toga_demo-0.2.2.dist-info\\RECORD'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "c:\users\my_user_name\envs\beeware\lib\site-packages\pip\basecommand.py", line 215, in main
    status = self.run(options, args)
  File "c:\users\my_user_name\envs\beeware\lib\site-packages\pip\commands\install.py", line 317, in run
    prefix=options.prefix_path,
  File "c:\users\my_user_name\envs\beeware\lib\site-packages\pip\req\req_set.py", line 742, in install
    **kwargs
  File "c:\users\my_user_name\envs\beeware\lib\site-packages\pip\req\req_install.py", line 831, in install
    self.move_wheel_files(self.source_dir, root=root, prefix=prefix)
  File "c:\users\my_user_name\envs\beeware\lib\site-packages\pip\req\req_install.py", line 1032, in move_wheel_files
    isolated=self.isolated,
  File "c:\users\my_user_name\envs\beeware\lib\site-packages\pip\wheel.py", line 528, in move_wheel_files
    shutil.move(temp_record, record)
  File "c:\users\my_user_name\envs\beeware\lib\shutil.py", line 553, in move
    os.unlink(src)
PermissionError: [WinError 5] Zugriff verweigert: 'c:\\users\\my_user_name\\envs\\beeware\\Lib\\site-packages\\toga_demo-0.2.2.dist-info\\RECORD.pip'

Error messege says that a file can´t be created because it already exists:

FileExistsError: [WinError 183] Eine Datei kann nicht erstellt werden, wenn sie bereits vorhanden ist: 

I guess it’s RECORD.pip

Cheers Tset

[freakboy3742]

Apologies for all the confusion here. Toga 0.2.0 did a pretty big reorganisation of the installation process, reversing an install dependency. As a result, installing Toga on Windows won’t get the expected result. You’ll need to manually install each of the components, and uninstall anything that got installed unexpectedly.

In particular, the Windows backend is still replying on cassowary, but all the toga core code is now referring to colosseum. This reflects a big internal change to the way widgets are laid out. I intend to get Windows support back at some point in the near future, and if you want to help, all assistance is definitely welcome - but in the meantime you definitely need to go in wearing all your helmets and safety pads.

[freakboy3742]

As noted on pybee/toga-demo#4, #67, and a couple of others, Window support is lagging behind other platforms at the moment. I’ll leave this ticket open as a note for others.