suggestion from Guido, along with a formal correctness proof of the
trickiest bit. The intricacy of the proof reveals how delicate this
is, but also how robust the conclusion: correctness doesn't rely on
dst() returning +- one hour (not all real time zones do!), it only
relies on:
1. That dst() returns a (any) non-zero value if and only if daylight
time is in effect.
and
2. That the tzinfo subclass implements a consistent notion of time zone.
The meaning of "consistent" was a hidden assumption, which is now an
explicit requirement in the docs. Alas, it's an unverifiable (by the
datetime implementation) requirement, but so it goes.
compiler flags which are necessary to get a clean compile. The former is
for user-specified optimizer, debug, trace fiddling. See patch 640843.
Add /sw/lib and /sw/include to setup.py search paths on Darwin to take
advantage of fink goodies.
Add scriptsinstall target to Makefile to install certain scripts from
Tools/scripts directory.
find a more elegant algorithm (OTOH, the hairy new implementation allows
user-written tzinfo classes to be elegant, so it's a big win even if
astimezone() remains hairy).
Darn! I've only got 10 minutes left to get falling-down drunk! I suppose
I'll have to smoke crack instead now.
understood now: it can't work. Added comments explaining why (it's "the
usual"-- unrepresentable hours in local time --but in a slightly different
guise).
The attached patch enables Cygwin Python to
build cleanly against the latest Cygwin Tcl/Tk
which is based on Tcl/Tk 8.3. It also prevents
building against the real X headers, if installed.
Remove broken code in visitDict(). I assume the code was trying to
add set lineno events for each line of a dict constructor, but I think
it was using the wrong object (node instead of k or v).
A variety of changes from Michael Hudson to get the compiler working
with 2.3. The primary change is the handling of SET_LINENO:
# The set_lineno() function and the explicit emit() calls for
# SET_LINENO below are only used to generate the line number table.
# As of Python 2.3, the interpreter does not have a SET_LINENO
# instruction. pyassem treats SET_LINENO opcodes as a special case.
A few other small changes:
- Remove unused code from pycodegen and pyassem.
- Fix error handling in parsermodule. When PyParser_SimplerParseString()
fails, it sets an exception with detailed info. The parsermodule
was clobbering that exception and replacing it was a generic
"could not parse string" exception. Keep the original exception.
an idea from Guido. This restores that the datetime implementation
never passes a datetime d to a tzinfo method unless d.tzinfo is the
tzinfo instance whose method is being called. That in turn allows
enormous simplifications in user-written tzinfo classes (see the Python
sandbox US.py and EU.py for fully fleshed-out examples).
d.astimezone(tz) also raises ValueError now if d lands in the one hour
of the year that can't be expressed in tz (this can happen iff tz models
both standard and daylight time). That it used to return a nonsense
result always ate at me, and it turned out that it seemed impossible to
force a consistent nonsense result under the new implementation (which
doesn't know anything about how tzinfo classes implement their methods --
it can only infer properties indirectly). Guido doesn't like this --
expect it to change.
New tests of conversion between adjacent DST-aware timezones don't pass
yet, and are commented out.
Running the datetime tests in a loop under a debug build leaks 9
references per test run, but I don't believe the datetime code is the
cause (it didn't leak the last time I changed the C code, and the leak
is the same if I disable all the tests that invoke the only function
that changed here). I'll pursue that next.
a month or two with great success. Barry may want to tweak it some, but I
think it's a worthwhile enough addition to get some more people trying it
out.
Andrew MacIntyre