Merge pull request github#2013 from RasmusWL/python-random-bag

Python: small improvements

Author: taus-semmle

python/ql/src/semmle/python/Exprs.qll

@@ -671,7 +671,7 @@ class Name extends Name_ {
         v = this.getVariable()
     }
 
-    /** Whether this expression is a definition */
+    /** Whether this expression is a deletion */
     predicate isDeletion() {
         py_expr_contexts(_, 2, this)
     }

python/ql/src/semmle/python/objects/ObjectAPI.qll

@@ -572,7 +572,7 @@ module ClassValue {
 
     /** Get the `ClassValue` for the `float` class. */
     ClassValue float_() {
-        result = TBuiltinClassObject(Builtin::builtin("float"))
+        result = TBuiltinClassObject(Builtin::special("float"))
     }
 
     /** Get the `ClassValue` for the `bytes` class (also called `str` in Python 2). */