Issue #16602: When a weakref's target was part of a long deallocation chain, the object could remain reachable through its weakref even though its refcount had dropped to zero.

Thanks to Eugene Toder for diagnosing and reporting the issue.

Issue #16602: When a weakref's target was part of a long deallocation chain, the object could remain reachable through its weakref even though its refcount had dropped to zero.

Thanks to Eugene Toder for diagnosing and reporting the issue.

Issue #16602: When a weakref's target was part of a long deallocation chain, the object could remain reachable through its weakref even though its refcount had dropped to zero.

Thanks to Eugene Toder for diagnosing and reporting the issue.

Patch by Steven Kryskalla.

Patch by Steven Kryskalla.

Patch by Steven Kryskalla.

- not allowed when implicitly re-raised the current exception
- last exception raised is always displayed last
- attempt to make it clearer when/if cause and context are shown

add fixer for reload() -> imp.reload() (closes #11797)\n\nPatch by Laurie Clark-Michalek and Berker Peksag

The NULL encoding check in bytes_decode() was unnecessary because this case
is already taken care of by the call to _Py_normalize_encoding() inside
PyUnicode_Decode().

Update comment: SAVE_EXC_STATE and SWAP_EXC_STATE macroses are saave_exc_state and swap_exc_state functions now.

Update comment: SAVE_EXC_STATE and SWAP_EXC_STATE macroses are saave_exc_state and swap_exc_state functions now.

to importlib.abc.SourceLoader.

Patch by Ilya Sandler.

Patch by Ilya Sandler.

Patch by Ilya Sandler.

 * Remove micro-optization:
   (errors == "surrogateescape" || strcmp(errors, "surrogateescape") == 0).
   Only use strcmp()
 * Initialize 'arg' members in unicode_format_arg() to help the compiler to
   diagnose real bugs and also make the code simpler to read

ASCII/surrogateescape codec is now used, instead of the locale encoding, to
decode the command line arguments. This change fixes inconsistencies with
os.fsencode() and os.fsdecode() because these operating systems announces an
ASCII locale encoding, whereas the ISO-8859-1 encoding is used in practice.