PEP 787: Defer pending PyPI library experimentation (#4389)

ncoghlan · hugovk · AA-Turner · web-flow · commit 3d628374557d · 2025-04-27T15:17:24.000Z
Co-authored-by: Hugo van Kemenade &lt;1324225+hugovk@users.noreply.github.com&gt;
Co-authored-by: Adam Turner &lt;9087854+AA-Turner@users.noreply.github.com&gt;
diff --git a/peps/pep-0787.rst b/peps/pep-0787.rst
@@ -2,7 +2,7 @@ PEP: 787
 Title: Safer subprocess usage using t-strings
 Author: Nick Humrich <nick@humrich.us>, Alyssa Coghlan <ncoghlan@gmail.com>
 Discussions-To: https://discuss.python.org/t/pep-787-safer-subprocess-usage-using-t-strings/88311
-Status: Draft
+Status: Deferred
 Type: Standards Track
 Requires: 750
 Created: 13-Apr-2025
@@ -18,6 +18,18 @@ proposes extending the :mod:`subprocess` and :mod:`shlex` modules to natively su
 safer and more ergonomic shell command execution with interpolated values, as well as
 serving as a reference implementation for the t-string feature to improve API ergonomics.
 
+PEP Deferral
+============
+
+During the discussions of the initial draft of the PEP, it became clear that t-strings provide
+a potential opportunity to offer ``shell=True`` levels of syntactic convenience for complex
+subprocess invocations without all of the security and cross-platform compatibility concerns
+that arise with giving user provided text access to a full system shell.
+
+To that end, the PEP authors now plan to work on an experimental :pypi:`t-string
+based subprocess invocation library <tstrprocess>` through the Python 3.14 beta
+period (and beyond), before preparing a revised draft of the proposal for Python 3.15.
+
 Motivation
 ==========
 
