Hi, This is a change in behaviour in macOS. The workaround is to create an NSApplication instance, for example by calling Cocoa.NSApplication.sharedApplication().
Ronald — Twitter: @ronaldoussoren Blog: https://blog.ronaldoussoren.net/ > On 29 Oct 2019, at 19:34, Ben Byram-Wigfield via Pythonmac-SIG > <pythonmac-sig@python.org> wrote: > > The following two lines work in Mojave, but flag an error in Catalina: > >>>> from AppKit import NSSavePanel >>>> panel = NSSavePanel.savePanel() > > The error is: > > 2019-10-29 18:24:22.275 Python[6577:255233] *** Assertion failure in > +[NSServiceViewController currentAppIsViewService], > /BuildRoot/Library/Caches/com.apple.xbs/Sources/ViewBridge/ViewBridge-462/NSViewService.m:140 > 2019-10-29 18:24:22.275 Python[6577:255233] *** Assertion failure in > +[NSServiceViewController currentAppIsViewService], > /BuildRoot/Library/Caches/com.apple.xbs/Sources/ViewBridge/ViewBridge-462/NSViewService.m:140 > 2019-10-29 18:24:22.342 Python[6577:255347] +[NSXPCSharedListener > endpointForReply:withListenerName:]: an error occurred while attempting to > obtain endpoint for listener 'com.apple.view-bridge': Connection interrupted > > This is with PyObjC 5.2. I get the same error (or not) in python 2.7 and > python 3.7. > > > _______________________________________________ > Pythonmac-SIG maillist - Pythonmac-SIG@python.org > https://mail.python.org/mailman/listinfo/pythonmac-sig > unsubscribe: https://mail.python.org/mailman/options/Pythonmac-SIG
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