This adds unsetenv to posix, and uses it in the __delitem__ method of
os.environ.

(XXX Should we change the preferred name for putenv to setenv, for
consistency?)

This was submitted by Moshe, but apparently he's too busy to check it
in himself.  He wrote:

    Here is a function in GNU readline called add_history,
    which is used to manage the history list. Though Python
    uses this function internally, it does not expose it to
    the Python programmer. This patch adds direct interface
    to this function with documentation.

    This could be used by friendly modules to "seed" the
    history with commands.

199712 didn't have dlfcn.h, or that it wouldn't conflict with the other
stuff defined.

TypeError (on systems where it's not defined at all, it raises
AttributeError; when it's defined, assignment to it raises TypeError).

Some AIX compiler didn't like the trailing comma at the end of the
why_code enum decl.

This is a big one, touching lots of files.  Some of the platforms
aren't tested yet.  Briefly, this changes the return value of the
os/posix functions stat(), fstat(), statvfs(), fstatvfs(), and the
time functions localtime(), gmtime(), and strptime() from tuples into
pseudo-sequences.  When accessed as a sequence, they behave exactly as
before.  But they also have attributes like st_mtime or tm_year.  The
stat return value, moreover, has a few platform-specific attributes
that are not available through the sequence interface (because
everybody expects the sequence to have a fixed length, these couldn't
be added there).  If your platform's struct stat doesn't define
st_blksize, st_blocks or st_rdev, they won't be accessible from Python
either.

(Still missing is a documentation update.)

The GUI-mode code to display properties blew up if the property functions
(get, set, etc) weren't simply methods (or functions).

"The problem" here is really that the generic document() method dispatches
to one of .doc{routine, class, module, other}(), but all of those require
a different(!) number of arguments.  Thus document isn't general-purpose
at all:  you have to know exactly what kind of thing is it you're going
to document first, in order to pass the correct number of arguments to
.document for it to pass on.  As an expedient hack, just tacked "*ignored"
on to the end of the formal argument lists for the .docXXX routines so
that .document's caller doesn't have to know in advance which path
.document is going to take.

<grp.h> it seems.  This requires yet another configure test.

#463572.  Closing.

The right fix is to generate line number events anyway ;-), but this will
have to do for now.

    compile should raise error for non-strings
SRE bug #432570, 448951:
    reset group after failed match

also bumped version number to 2.2.0

(With slight cosmetic improvements to shorten lines and a grammar fix
to a docstring.)

This addes -X and -E options to freeze.  From the docstring:

-X module     Like -x, except the module can never be imported by
              the frozen binary.

-E:           Freeze will fail if any modules can't be found (that
              were not excluded using -x or -X).

points in the spawn*() description.

This fixes the behavior reported by SF bug #404545, where a file
x.y.py could be imported by the statement "import x.y" when there's a
frozen package x (I believe even if x.y also exists as a frozen
module).

:-).

Add a test that prevents the __hello__ bytecode from going stale
unnoticed again.

The test also tests the loophole noted in SF bug #404545.  This test
will fail right now; I'll check in the fix in a minute.

Remove inconsistent use of HTMLDIR.

handlers.  This was fixed in Objects/weakrefobject.c 1.2.

the left-hand operand may not be the proxy in all cases.  If it isn't,
we end up doing two things: a) unwrapping something that isn't a
PyWeakReference (later resulting in a core dump) and b) passing a
proxy as the right-hand operand anyway, even though that can't be
handled by the actual handler (maybe eventually causing a core dump).

This is fixed by always unwrapping all the proxies involved before
passing anything to the actual handler.

Solved with a helper method that calls finish_request() and then
close_request().  The code is by Max Neunhöffer.

The symbol table pass didn't have an explicit case for the list_iter
node which is used only for a nested list comprehension.  As a result,
the target of the list comprehension was treated as a use instead of
an assignment.  Fix is to add a case to symtable_node() to handle
list_iter.

Also, rework and document a couple of the subtler implementation
issues in the symbol table pass.  The symtable_node() switch statement
depends on falling through the last several cases, in order to handle
some of the more complicated nodes like atom.  Add a comment
explaining the behavior before the first fall through case.  Add a
comment /* fall through */ at the end of case so that it is explicitly
marked as such.

Move the for_stmt case out of the fall through logic, which simplifies
both for_stmt and default.  (The default used the local variable start
to skip the first three nodes of a for_stmt when it fell through.)

Rename the flag argument to symtable_assign() to def_flag and add a
comment explaining its use:

   The third argument to symatble_assign() is a flag to be passed to
   symtable_add_def() if it is eventually called.  The flag is useful
   to specify the particular type of assignment that should be
   recorded, e.g. an assignment caused by import.

The fix is a band-aid: type_call() now makes the same exception for a
single-argument call to type() as type_new() was already making.

to link a C++ main using the C++ compiler. Fixes #472007.