From 0cfde115ffc2da29dd1b7503c0d0d1368185fc53 Mon Sep 17 00:00:00 2001
From: Mark Zhitomirski <marcuzero@gmail.com>
Date: Fri, 31 Oct 2025 00:13:17 +0400
Subject: [PATCH] fix ValueError in f_locals.pop('self') Python 3.13+
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The error
ValueError: cannot remove local variables from FrameLocalsProxy

is caused by PEP 667 – Consistent views of namespaces
peps.python.org/pep-0667
implemented in Python 3.13
---
 Exercises/ex6_2.md         | 9 ++++++---
 Exercises/soln6_2.md       | 3 ++-
 Exercises/soln6_3.md       | 3 ++-
 Solutions/6_2/structure.py | 3 ++-
 Solutions/6_3/structure.py | 3 ++-
 5 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/Exercises/ex6_2.md b/Exercises/ex6_2.md
index cd90e833..93ba28fd 100644
--- a/Exercises/ex6_2.md
+++ b/Exercises/ex6_2.md
@@ -61,8 +61,9 @@ and class definitions:
 
 ```python
 >>> def _init(locs):
-        self = locs.pop('self')
+        self = locs['self']
         for name, val in locs.items():
+            if name == 'self': continue
             setattr(self, name, val)
 
 >>> class Stock:
@@ -96,8 +97,9 @@ frame hacking.  Try this variant of the `_init()` function:
 >>> import sys
 >>> def _init():
         locs = sys._getframe(1).f_locals   # Get callers local variables
-        self = locs.pop('self')
+        self = locs['self']
         for name, val in locs.items():
+            if name == 'self': continue
             setattr(self, name, val)
 >>>
 ```
@@ -135,8 +137,9 @@ class Structure:
     @staticmethod
     def _init():
         locs = sys._getframe(1).f_locals
-        self = locs.pop('self')
+        self = locs['self']
         for name, val in locs.items():
+            if name == 'self': continue
             setattr(self, name, val)
     ...
 ```
diff --git a/Exercises/soln6_2.md b/Exercises/soln6_2.md
index 1f4dc4eb..476c1c01 100644
--- a/Exercises/soln6_2.md
+++ b/Exercises/soln6_2.md
@@ -11,8 +11,9 @@ class Structure:
     @staticmethod
     def _init():
         locs = sys._getframe(1).f_locals
-        self = locs.pop('self')
+        self = locs['self']
         for name, val in locs.items():
+            if name == 'self': continue
             setattr(self, name, val)
 
     def __setattr__(self, name, value):
diff --git a/Exercises/soln6_3.md b/Exercises/soln6_3.md
index 2633d014..84864e95 100644
--- a/Exercises/soln6_3.md
+++ b/Exercises/soln6_3.md
@@ -12,8 +12,9 @@ class Structure:
     @staticmethod
     def _init():
         locs = sys._getframe(1).f_locals
-        self = locs.pop('self')
+        self = locs['self']
         for name, val in locs.items():
+            if name == 'self': continue
             setattr(self, name, val)
 
     def __setattr__(self, name, value):
diff --git a/Solutions/6_2/structure.py b/Solutions/6_2/structure.py
index fb485252..c925b160 100644
--- a/Solutions/6_2/structure.py
+++ b/Solutions/6_2/structure.py
@@ -8,8 +8,9 @@ class Structure:
     @staticmethod
     def _init():
         locs = sys._getframe(1).f_locals
-        self = locs.pop('self')
+        self = locs['self']
         for name, val in locs.items():
+            if name == 'self': continue
             setattr(self, name, val)
 
     def __setattr__(self, name, value):
diff --git a/Solutions/6_3/structure.py b/Solutions/6_3/structure.py
index 55b08ce3..bec51990 100644
--- a/Solutions/6_3/structure.py
+++ b/Solutions/6_3/structure.py
@@ -9,8 +9,9 @@ class Structure:
     @staticmethod
     def _init():
         locs = sys._getframe(1).f_locals
-        self = locs.pop('self')
+        self = locs['self']
         for name, val in locs.items():
+            if name == 'self': continue
             setattr(self, name, val)
 
     def __setattr__(self, name, value):