Clarify why we don't do hasattr(var, '__exit__).

2004-06-18 11:41:03 +00:00 · 2004-06-18 11:41:03 +00:00 · c86e93c058
parent 28e33e4c96
commit c86e93c058
1 changed files with 3 additions and 2 deletions
--- a/pep-0310.txt
+++ b/pep-0310.txt
@ -68,8 +68,9 @@ Basic Syntax and Semantics
 	finally:
            var.__exit__()

-    Note that this makes using an object that does not have an
-    __exit__() method a fail-fast error.
+    (The presence of an __exit__ method is *not* checked like that of
+    __enter__ to ensure that using inappropriate objects in with:
+    statements gives an error).

    If the variable is omitted, an unnamed object is allocated on the
    stack.  In that case, the suite has no access to the unnamed object.