20 Other Changes and Fixes
As usual, there were a bunch of other improvements and bugfixes
scattered throughout the source tree. A search through the CVS change
logs finds there were 523 patches applied and 514 bugs fixed between
Python 2.2 and 2.3. Both figures are likely to be underestimates.
Some of the more notable changes are:
- If the PYTHONINSPECT environment variable is set, the
Python interpreter will enter the interactive prompt after running a
Python program, as if Python had been invoked with the -i
option. The environment variable can be set before running the Python
interpreter, or it can be set by the Python program as part of its
execution.
- The regrtest.py script now provides a way to allow ``all
resources except foo.'' A resource name passed to the
-u option can now be prefixed with a hyphen
("-") to mean ``remove this resource.'' For example, the
option `
-uall,-bsddb' could be used to enable the
use of all resources except bsddb.
- The tools used to build the documentation now work under Cygwin
as well as Unix.
- The
SET_LINENO opcode has been removed. Back in the
mists of time, this opcode was needed to produce line numbers in
tracebacks and support trace functions (for, e.g., pdb).
Since Python 1.5, the line numbers in tracebacks have been computed
using a different mechanism that works with ``python -O''. For Python
2.3 Michael Hudson implemented a similar scheme to determine when to
call the trace function, removing the need for SET_LINENO
entirely.
It would be difficult to detect any resulting difference from Python
code, apart from a slight speed up when Python is run without
-O.
C extensions that access the f_lineno field of frame objects
should instead call PyCode_Addr2Line(f->f_code, f->f_lasti).
This will have the added effect of making the code work as desired
under ``python -O'' in earlier versions of Python.
A nifty new feature is that trace functions can now assign to the
f_lineno attribute of frame objects, changing the line that
will be executed next. A "jump" command has been added to the
pdb debugger taking advantage of this new feature.
(Implemented by Richie Hindle.)
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