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-rw-r--r--Doc/whatsnew/3.4.rst5
1 files changed, 5 insertions, 0 deletions
diff --git a/Doc/whatsnew/3.4.rst b/Doc/whatsnew/3.4.rst
index 4a65b89..971afc4 100644
--- a/Doc/whatsnew/3.4.rst
+++ b/Doc/whatsnew/3.4.rst
@@ -2249,6 +2249,11 @@ Changes in the Python API
future have no default, all calls to :func:`hmac.new` should be changed to
explicitly specify a *digestmod* (:issue:`17276`).
+* Calling :func:`sysconfig.get_config_var` with the ``SO`` key, or looking
+ ``SO`` up in the results of a call to :func:`sysconfig.get_config_vars`
+ is deprecated. This key should be replaced by ``EXT_SUFFIX`` or
+ ``SHLIB_SUFFIX``, depending on the context (:issue:`19555`).
+
* Any calls to ``open`` functions that specify ``U`` should be modified.
``U`` is ineffective in Python3 and will eventually raise an error if used.
Depending on the function, the equivalent of its old Python2 behavior can be