Author: Armin Rigo <[email protected]>
Branch:
Changeset: r83964:434d21e15d0d
Date: 2016-04-27 10:32 +0200
http://bitbucket.org/pypy/pypy/changeset/434d21e15d0d/
Log: Document the AttributeError/TypeError difference with CPython about
built-in types
diff --git a/pypy/doc/cpython_differences.rst b/pypy/doc/cpython_differences.rst
--- a/pypy/doc/cpython_differences.rst
+++ b/pypy/doc/cpython_differences.rst
@@ -387,6 +387,14 @@
wrappers. On PyPy we can't tell the difference, so
``ismethod([].__add__) == ismethod(list.__add__) == True``.
+* in CPython, the built-in types have attributes that can be
+ implemented in various ways. Depending on the way, if you try to
+ write to (or delete) a read-only (or undeletable) attribute, you get
+ either a ``TypeError`` or an ``AttributeError``. PyPy tries to
+ strike some middle ground between full consistency and full
+ compatibility here. This means that a few corner cases don't raise
+ the same exception, like ``del (lambda:None).__closure__``.
+
* in pure Python, if you write ``class A(object): def f(self): pass``
and have a subclass ``B`` which doesn't override ``f()``, then
``B.f(x)`` still checks that ``x`` is an instance of ``B``. In
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