Warnings may be emitted during Python shutdown, like "unclosed file XXX".
During shutdown, globals()['__main__'] may be None.

"\xe9\u20ac" characters

characters.

Use fast memcmp() instead of a loop using the slow PyUnicode_READ() macro.
strlen() is still necessary to check Unicode string containing null bytes.

It is causing trouble like e.g. hanging processes.

It is causing trouble like e.g. hanging processes.

failure (memory allocation failure): raise a MemoryError exception

attributes before checking for error. The destructor expects all attributes to
be set. It is now safe to call Py_DECREF(unicode) in the constructor.

PyTuple_New() failure

PyObject_IsInstance() failure

On AIX, the locale encoding may be "iso8859-1", which was not a known syntax of
the legacy ISO 8859-1 encoding.

Using a C codec instead of a Python codec is faster but also avoids tricky
issues during Python startup or complex code.

_ctypes_alloc_format_string() failure

allocation failure

PyByteArray_FromStringAndSize() failure (ex: on memory allocation failure)

_PyBytes_Resize(&new) sets new to NULL on error, don't call Py_DECREF() with NULL.

ZIP archive.

memory allocation failure

exceptions when merging fast locals into f_locals of a frame.
PyEval_GetLocals() now raises an exception and return NULL on failure.