ENH: Add support for IndirectObject.__iter__ (#3228)

Closes #3227.

Author: bryan-brancotte

pypdf/generic/_base.py

@@ -393,6 +393,9 @@ def __getitem__(self, key: Any) -> Any:
     def __contains__(self, key: Any) -> bool:
         return key in self._get_object_with_check()  # type: ignore
 
+    def __iter__(self) -> Any:
+        return self._get_object_with_check().__iter__()  # type: ignore
+
     def __float__(self) -> str:
         # in this case we are looking for the pointed data
         return self.get_object().__float__()  # type: ignore

tests/test_generic.py

@@ -1039,6 +1039,13 @@ def test_indirect_object_contains():
     assert "/Producer" in indirect_object
 
 
+def test_indirect_object_iter():
+    writer = PdfWriter()
+    indirect_object = IndirectObject(1, 0, writer)
+    assert "foo" not in list(indirect_object)
+    assert "/Producer" in list(indirect_object)
+
+
 def test_array_operators():
     a = ArrayObject(
         [