From d1011abafa56abf28e46280f47197e2bc212378a Mon Sep 17 00:00:00 2001
From: Arjun-coder-ops <goguarjun422@gmail.com>
Date: Tue, 31 Mar 2026 00:50:11 +0530
Subject: [PATCH] feat(stdlib): implement missing set update and pop methods

---
 python/builtins.py | 23 +++++++++++++++++++++++
 tests/470_set.py   | 18 +++++++++++++++++-
 2 files changed, 40 insertions(+), 1 deletion(-)

diff --git a/python/builtins.py b/python/builtins.py
index 22991e1b..8a3fa7f1 100644
--- a/python/builtins.py
+++ b/python/builtins.py
@@ -190,6 +190,29 @@ class set:
     def __contains__(self, elem):
         return elem in self._a
     
+    def pop(self):
+        if not self._a:
+            raise KeyError('pop from an empty set')
+        # dict.popitem() returns (key, value) tuple
+        k, _ = self._a.popitem()
+        return k
+
+    def difference_update(self, other):
+        for elem in other:
+            self.discard(elem)
+
+    def intersection_update(self, other):
+        to_remove = [elem for elem in self if elem not in other]
+        for elem in to_remove:
+            self.remove(elem)
+
+    def symmetric_difference_update(self, other):
+        for elem in other:
+            if elem in self:
+                self.remove(elem)
+            else:
+                self.add(elem)
+
     def __repr__(self):
         if len(self) == 0:
             return 'set()'
diff --git a/tests/470_set.py b/tests/470_set.py
index 7c339a1a..d3181fd9 100644
--- a/tests/470_set.py
+++ b/tests/470_set.py
@@ -87,4 +87,20 @@ assert not {1,2,3}.isdisjoint({2,3,4})
 
 # a = set()
 # b = {*a, 1, 2, 3, *a, *a}
-# assert b == {1, 2, 3}
\ No newline at end of file
+# assert b == {1, 2, 3}
+a = {1, 2, 3}
+b = a.pop()
+assert b in {1, 2, 3}
+assert len(a) == 2
+
+a = {1, 2, 3}
+a.difference_update({2, 3, 4})
+assert a == {1}
+
+a = {1, 2, 3}
+a.intersection_update({2, 3, 4})
+assert a == {2, 3}
+
+a = {1, 2, 3}
+a.symmetric_difference_update({2, 3, 4})
+assert a == {1, 4}