Issue #10145: the float.is_integer method was undocumented.

Doc/library/stdtypes.rst

@@ -530,10 +530,20 @@ The float type has some additional methods.
 
 .. method:: float.as_integer_ratio()
 
-    Return a pair of integers whose ratio is exactly equal to the
-    original float and with a positive denominator.  Raises
-    :exc:`OverflowError` on infinities and a :exc:`ValueError` on
-    NaNs.
+   Return a pair of integers whose ratio is exactly equal to the
+   original float and with a positive denominator.  Raises
+   :exc:`OverflowError` on infinities and a :exc:`ValueError` on
+   NaNs.
+
+.. method:: float.is_integer()
+
+   Return ``True`` if the float instance is finite with integral
+   value, and ``False`` otherwise::
+
+      >>> (-2.0).is_integer()
+      True
+      >>> (3.2).is_integer()
+      False
 
 Two methods support conversion to
 and from hexadecimal strings.  Since Python's floats are stored