Float is not a sequence

tests/test_items.py

@@ -1,8 +1,10 @@
 from __future__ import annotations
 
 import copy
+import ctypes
 import math
 import pickle
+import sys
 
 from collections.abc import Callable
 from datetime import date
@@ -101,6 +103,18 @@ def test_float_unwrap() -> None:
     elementary_test(item(2.78), float)
 
 
+@pytest.mark.skipif(
+    sys.implementation.name != "cpython", reason="PySequence_Check is CPython-specific"
+)
+def test_float_is_not_a_sequence() -> None:
+    value = parse("a = [1.0, 2.0, 3.0]")["a"][0]
+    py_sequence_check = ctypes.pythonapi.PySequence_Check
+    py_sequence_check.argtypes = [ctypes.py_object]
+    py_sequence_check.restype = ctypes.c_int
+
+    assert not py_sequence_check(value)
+
+
 def test_false_unwrap() -> None:
     elementary_test(item(False), bool)
 

tomlkit/items.py

@@ -540,15 +540,6 @@ def __reduce__(self) -> tuple[type, tuple[object, ...]]:
     def __reduce_ex__(self, protocol: int) -> tuple[type, tuple[object, ...]]:  # type: ignore[override]
         return self.__class__, self._getstate(protocol)
 
-    def __getitem__(self, key: Key | str | int) -> Any:
-        raise TypeError(f"{type(self).__name__} does not support item access")
-
-    def __setitem__(self, key: Key | str | int, value: Any) -> None:
-        raise TypeError(f"{type(self).__name__} does not support item assignment")
-
-    def __delitem__(self, key: Key | str | int) -> None:
-        raise TypeError(f"{type(self).__name__} does not support item deletion")
-
 
 class Whitespace(Item):
     """
@@ -1824,10 +1815,10 @@ def __iter__(self) -> Iterator[str]:
     def __len__(self) -> int:
         return len(self._value)
 
-    def __delitem__(self, key: Key | str) -> None:  # type: ignore[override]
+    def __delitem__(self, key: Key | str) -> None:
         self.remove(key)
 
-    def __getitem__(self, key: Key | str) -> Any:  # type: ignore[override]
+    def __getitem__(self, key: Key | str) -> Any:
         return self._value[key]
 
     def __contains__(self, key: object) -> bool:
@@ -1839,7 +1830,7 @@ def __contains__(self, key: object) -> bool:
         # for an out-of-order entry, so validation runs exactly as before.
         return key in self._value
 
-    def __setitem__(self, key: Key | str, value: Any) -> None:  # type: ignore[override]
+    def __setitem__(self, key: Key | str, value: Any) -> None:
         if not isinstance(value, Item):
             value = item(value, _parent=self)
 
@@ -2181,7 +2172,7 @@ def _render_dotted(self, key: Key, table: Table) -> list[str]:
                 )
         return parts
 
-    def __setitem__(self, key: Key | str, value: Any) -> None:  # type: ignore[override]
+    def __setitem__(self, key: Key | str, value: Any) -> None:
         if hasattr(value, "trivia") and value.trivia.comment:
             value.trivia.comment = ""
         if not isinstance(value, Item):
@@ -2196,7 +2187,7 @@ def _getstate(self, protocol: int = 3) -> tuple[container.Container, Trivia]:
         return (self._value, self._trivia)
 
 
-class String(str, Item):  # type: ignore[misc]
+class String(str, Item):
     """
     A string literal.
     """