Bug report

Bug description:

Consider the scenario whereupdatecache is called with a frozen module andmodule_globals isNone.

In that case,_source_unavailable returns false because it is a frozen module, but becausemodule_globals isNone, the code carries on to look for the 'file'<frozen module> everywhere insys.path. Compare that to the behavior prior to#132662 where that frozen module would simply return unavailable. I would recommend the following change:

iffilename.startswith("<frozen ")andmodule_globalsisnotNone:# This is a frozen module, so we need to use the filename# from the module globals.fullname=module_globals.get("__file__")iffullnameisNone:print("fullname none")return []

Into

iffilename.startswith("<frozen "):ifmodule_globalsisNone:return []# This is a frozen module, so we need to use the filename# from the module globals.fullname=module_globals.get("__file__")iffullnameisNone:print("fullname none")return []

For context, this is a problem for us because we run in a sandbox which restricts many OS operations, and this is performing useless os operations where it didn't prior to3.14.

If there is agreement and it is helpful, happy to contribute a PR for this small change.

CPython versions tested on:

3.14

Operating systems tested on:

macOS, Windows, Linux

Linked PRs

• gh-140228: Linecache source is unavailable for frozen modules when global modules is None #140377
• [3.14] gh-140228: Avoid making unnecessary syscalls in linecache for frozen modules (GH-140377) #140738