A `python xxx.py` script opens up a cmd window that does not close itself

[fanmingyu212]

activate artiq && python "C:\Users\scientist\code\pydux\lib\control\clients\switched_ws8_client.py" creates a cmd window that won't close itself.

[fanmingyu212]

activate artiq && start pythonw "C:\Users\scientist\code\pydux\lib\control\clients\switched_ws8_client.py" starts the wavemeter without the cmd window.

[fanmingyu212]

Error message:

Traceback (most recent call last):
  File "C:\Users\scientist\Anaconda3\envs\artiq\lib\site-packages\tray_launcher\gui.py", line 179, in restart_script
    self.start_new_script(args[0][0])
  File "C:\Users\scientist\Anaconda3\envs\artiq\lib\site-packages\tray_launcher\gui.py", line 106, in start_new_script
    name = script_path.name
AttributeError: 'str' object has no attribute 'name'

[danhuaxu]

Ok, here is what I found: when we call python xxx.py, a new console window will always be created unless it is run from an existing console window, whereas when we do pythonw xxx.py, no console window will apear anyway. (Source: https://stackoverflow.com/questions/9705982/pythonw-exe-or-python-exe)

This explains what we saw: when the tray_launcher is opened with pythonw, no console window is brought up for it, so when it calls python ...py, a new console window shows up. On the other hand, if the tray launcher is opened with python, it is associated with this console window (so if you close this console window, the tray launcher goes away) even though no new console is created. In this case, calls to python ...py or pythonw ...py won't create new windows.

Seems there is no work around this. There must be at least one console window, unless all .bat scripts use pythonw instead of python. To be honest, this kind of defeats the purpose of this tray launcher?

I am more inclined to have one console window up, i.e. use python to invoke the tray launcher. This way there is at most one console window and it is not blocked -- might make it easier for later communicating with the tray launcher using cmd.

Thoughts?

[fanmingyu212]

Would the creationflags keyword solve it? https://stackoverflow.com/a/25124003/4696323

[danhuaxu]

Would the creationflags keyword solve it? https://stackoverflow.com/a/25124003/4696323

That looks promising. I feel ashamed.

[danhuaxu]

creationflags argument does help.