Simplify _compat.py now that we only run on newer Pythonsremove_u

- We have u'literals' so we don't need a _u() function.
  For the record the Emacs replacement regex was
  `_u(\(['"]\)\([^)]*\)\1) -> u\1\2\1`. Amazingly, I typed that right
  on the first try.

A few things were only used in one (test) file or function, so it was
better to keep the use, if any, local and out of the "public" api:

- We can use io.StringIO everywhere and it's fast. It was only
 imported in one file anyway.
- We can just import pickle. It was only imported in one file anyway.
- TEXT was only used in one test function, `type(u'')` is just as
 clear (especially since the usual name is `text_type`).
- reload was only used in one test function, so move the definition
 there.

1 files changed, 1 insertions, 2 deletions

diff --git a/src/zope/security/checker.py b/src/zope/security/checker.py
index f870a13..d275b51 100644
--- a/src/zope/security/checker.py
+++ b/src/zope/security/checker.py
@@ -49,7 +49,6 @@ from zope.security.interfaces import Unauthorized
 from zope.security._definitions import thread_local
 from zope.security._compat import CLASS_TYPES
 from zope.security._compat import PYTHON2
-from zope.security._compat import _u
 from zope.security.proxy import Proxy
 from zope.security.proxy import getChecker
 
@@ -687,7 +686,7 @@ BasicTypes_examples = {
 }
 
 if PYTHON2:
-    BasicTypes_examples[unicode] = _u('uabc')
+    BasicTypes_examples[unicode] = u'uabc'
     BasicTypes_examples[long] = long(65536)