namespace if it occurs as a free variable in a nested block. This limitation
of the compiler has been lifted, and a new opcode introduced (DELETE_DEREF).
This sample was valid in 2.6, but fails to compile in 3.x without this change::
>>> def f():
... def print_error():
... print(e)
... try:
... something
... except Exception as e:
... print_error()
... # implicit "del e" here
This sample has always been invalid in Python, and now works::
>>> def outer(x):
... def inner():
... return x
... inner()
... del x
There is no need to bump the PYC magic number: the new opcode is used
for code that did not compile before.
a single `\UXXXXXXXX`, regardless of whether the character is printable
or not. Also, the "backslashreplace" error handler now joins surrogate
pairs into a single character on UCS-2 builds.
'once_registry'. This is bad as the warnings module had variables named
'defaultaction' and 'onceregistry' which are what people should be looking at
(technically those variables shouldn't be mucked with as they are undocumented,
but we all know better than to believe that isn't happening). So the variables
from _warnings have been renamed to come off as private and to avoid confusion
over what variable should be used.
Closes issue #9766. Thanks to Antoine Pitrou for the discovery.
Failure to do it may result in strange error messages or even crashes,
in admittedly convoluted cases that are normally syntax errors, like:
def f(*xx, __debug__): pass
Call _wfopen() on Windows, or fopen() otherwise. Return the new file object on
success, or NULL if the file cannot be open or (if PyErr_Occurred()) on unicode
error.
* On non-Windows OSes: the constructor accepts bytes filenames
and use surrogateescape for unicode filenames
* On Windows: use GetFileAttributesW() instead of GetFileAttributesA()
