diff --git a/stdlib/builtins.pyi b/stdlib/builtins.pyi
index c4d7c0830..52433440c 100644
--- a/stdlib/builtins.pyi
+++ b/stdlib/builtins.pyi
@@ -259,24 +259,24 @@ class float:
     @property
     def imag(self) -> float: ...
     def conjugate(self) -> float: ...
-    def __add__(self, x: float) -> float: ...
-    def __sub__(self, x: float) -> float: ...
-    def __mul__(self, x: float) -> float: ...
-    def __floordiv__(self, x: float) -> float: ...
-    def __truediv__(self, x: float) -> float: ...
-    def __mod__(self, x: float) -> float: ...
-    def __divmod__(self, x: float) -> tuple[float, float]: ...
+    def __add__(self, __x: float) -> float: ...
+    def __sub__(self, __x: float) -> float: ...
+    def __mul__(self, __x: float) -> float: ...
+    def __floordiv__(self, __x: float) -> float: ...
+    def __truediv__(self, __x: float) -> float: ...
+    def __mod__(self, __x: float) -> float: ...
+    def __divmod__(self, __x: float) -> tuple[float, float]: ...
     def __pow__(
-        self, x: float, mod: None = ...
+        self, __x: float, __mod: None = ...
     ) -> float: ...  # In Python 3, returns complex if self is negative and x is not whole
-    def __radd__(self, x: float) -> float: ...
-    def __rsub__(self, x: float) -> float: ...
-    def __rmul__(self, x: float) -> float: ...
-    def __rfloordiv__(self, x: float) -> float: ...
-    def __rtruediv__(self, x: float) -> float: ...
-    def __rmod__(self, x: float) -> float: ...
-    def __rdivmod__(self, x: float) -> tuple[float, float]: ...
-    def __rpow__(self, x: float, mod: None = ...) -> float: ...
+    def __radd__(self, __x: float) -> float: ...
+    def __rsub__(self, __x: float) -> float: ...
+    def __rmul__(self, __x: float) -> float: ...
+    def __rfloordiv__(self, __x: float) -> float: ...
+    def __rtruediv__(self, __x: float) -> float: ...
+    def __rmod__(self, __x: float) -> float: ...
+    def __rdivmod__(self, __x: float) -> tuple[float, float]: ...
+    def __rpow__(self, __x: float, __mod: None = ...) -> float: ...
     def __getnewargs__(self) -> tuple[float]: ...
     def __trunc__(self) -> int: ...
     if sys.version_info >= (3, 9):
@@ -286,12 +286,12 @@ class float:
     def __round__(self, ndigits: None = ...) -> int: ...
     @overload
     def __round__(self, ndigits: SupportsIndex) -> float: ...
-    def __eq__(self, x: object) -> bool: ...
-    def __ne__(self, x: object) -> bool: ...
-    def __lt__(self, x: float) -> bool: ...
-    def __le__(self, x: float) -> bool: ...
-    def __gt__(self, x: float) -> bool: ...
-    def __ge__(self, x: float) -> bool: ...
+    def __eq__(self, __x: object) -> bool: ...
+    def __ne__(self, __x: object) -> bool: ...
+    def __lt__(self, __x: float) -> bool: ...
+    def __le__(self, __x: float) -> bool: ...
+    def __gt__(self, __x: float) -> bool: ...
+    def __ge__(self, __x: float) -> bool: ...
     def __neg__(self) -> float: ...
     def __pos__(self) -> float: ...
     def __str__(self) -> str: ...
@@ -311,18 +311,18 @@ class complex:
     @property
     def imag(self) -> float: ...
     def conjugate(self) -> complex: ...
-    def __add__(self, x: complex) -> complex: ...
-    def __sub__(self, x: complex) -> complex: ...
-    def __mul__(self, x: complex) -> complex: ...
-    def __pow__(self, x: complex, mod: None = ...) -> complex: ...
-    def __truediv__(self, x: complex) -> complex: ...
-    def __radd__(self, x: complex) -> complex: ...
-    def __rsub__(self, x: complex) -> complex: ...
-    def __rmul__(self, x: complex) -> complex: ...
-    def __rpow__(self, x: complex, mod: None = ...) -> complex: ...
-    def __rtruediv__(self, x: complex) -> complex: ...
-    def __eq__(self, x: object) -> bool: ...
-    def __ne__(self, x: object) -> bool: ...
+    def __add__(self, __x: complex) -> complex: ...
+    def __sub__(self, __x: complex) -> complex: ...
+    def __mul__(self, __x: complex) -> complex: ...
+    def __pow__(self, __x: complex, mod: None = ...) -> complex: ...
+    def __truediv__(self, __x: complex) -> complex: ...
+    def __radd__(self, __x: complex) -> complex: ...
+    def __rsub__(self, __x: complex) -> complex: ...
+    def __rmul__(self, __x: complex) -> complex: ...
+    def __rpow__(self, __x: complex, __mod: None = ...) -> complex: ...
+    def __rtruediv__(self, __x: complex) -> complex: ...
+    def __eq__(self, __x: object) -> bool: ...
+    def __ne__(self, __x: object) -> bool: ...
     def __neg__(self) -> complex: ...
     def __pos__(self) -> complex: ...
     def __str__(self) -> str: ...