`types.LazyImportType` is not initialized

[johnslavik]

Bug report

Bug description:

At runtime, types.LazyImportType is an uninitialized static type (unless you e.g. access types.LazyImportType.resolve first).

This can lead to funky behaviors:

lazy import wave, traceback

try:
    help(globals()['wave'].resolve)  # However, a call ".resolve()" would work
except AttributeError as e:
    print(e)  # 'lazy_import' object has no attribute 'resolve'

try:
    help(globals()['wave'].resolve)
except AttributeError:
    # traceback.format_exc() initializes types.LazyImportType as a side effect.
    # This prints "AttributeError: 'lazy_import' object has no attribute 'resolve'".
    print(traceback.format_exc().splitlines()[-1])
 
print(globals()['wave'].resolve)  # Succeeds.

The solution I found is to add &PyLazyImport_Type to static_types[], the array of types initialized in _PyTypes_InitTypes during interpreter startup.

CPython versions tested on:

CPython main branch

Operating systems tested on:

macOS

Linked PRs

• gh-145452: Initialize PyLazyImport_Type during interpreter startup #145453

[johnslavik]

cc @Yhg1s @DinoV @pablogsal @ZeroIntensity @vstinner @serhiy-storchaka