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…ame (pythonGH-153799) `zipimporter.get_filename()` compiled source modules just to work out the module's file name. `find_spec()` calls it through `spec_from_loader()`, so importing a source module from a ZIP archive compiled it twice and emitted every `SyntaxWarning` twice. `get_filename()` now returns before reading or compiling the source. As a result, a `SyntaxError` in a zipped source module is now raised by `exec_module()` rather than by `find_spec()` or `get_filename()`, and the source isn't compiled twice during import, which matches the filesystem-based loaders. (cherry picked from commit 230917f)
itamaro
requested review from
brettcannon,
ericsnowcurrently,
ncoghlan and
warsaw
as code owners
November 6, 2026 16:49
This was referenced Nov 6, 2026
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zipimporter.get_filename()compiled source modules just to work out themodule's file name.
find_spec()calls it throughspec_from_loader(), soimporting a source module from a ZIP archive compiled it twice and emitted
every
SyntaxWarningtwice.get_filename()now returns before reading or compiling the source.As a result, a
SyntaxErrorin a zipped source module is now raised byexec_module()rather than byfind_spec()orget_filename(), andthe source isn't compiled twice during import, which matches
the filesystem-based loaders.
(cherry picked from commit 230917f)
Co-authored-by: Harjoth Khara harjoth.khara@gmail.com