Tools/scripts/h2py.py. This file contains many useful streamio(7)
constants, especially the ones that support passing open file
descriptors through a pipe: I_RECVFD and I_SENDFD.
In string.splitfields(), ignore maxsplit if <= 0, rather than ignoring
maxsplit=0 but effectively treating negative numbers the same as
maxsplit=1. Also made the test for maxsplit slightly more efficient
(set it to the length of the string when <= 0 so the test for its
presence can be omitted from the loop).
the writing of filters.
Typical use is:
import fileinput
for line in fileinput.input():
process(line)
This iterates over the lines of all files listed in sys.argv[1:],
defaulting to sys.stdin if the list is empty or when a filename is
'-'.
There is also an option to use this to direct the output back to the
input files.
class from the standard base exception Exception. Otherwise define
Queue.Empty as a string exception.
(Queue): 8-space to 4-space indentation conversion. Also, basically
recast all method comments into docstrings.
format(), str(), atof(), and atoi(). The last three are locale
sensitive versions of the corresponding standard functions (only for
numbers though); format() does general %[efg] formatting taking the
locale into account, optionally with thousands grouping.
All geometry manager methods that apply to a master widget instead of
to a slave widget have been moved to the Misc class, which is
inherited by all of Tk(), Toplevel() and Widget(). They have been
renamed to have their geometry manager name as a prefix,
e.g. pack_propagate(); the short names can still be used where
ambiguities are resolved so that pack has priority over place has
priority over grid (since this was the old rule).
Also, the method definitions in the Pack, Place and Grid classes now
all have their respective geometry manager name as a prefix
(e.g. pack_configure); the shorter names are aliases defined through
assignment.
A similar renaming has been done for all config() methods found
elsewhere; these have been renamed to configure() with config being
the alias (instead of the other way around). (This may not make much
of a difference but the official Tk command name is now 'configure'
and it may help in debugging tracebacks.)
Finally, a new base class BaseWidget has been introduced, which
implements the methods common between Widget and Toplevel (the
difference between those two classes is that Toplevel has a different
__init__() but also that Toplevel doesn't inherit from Pack, Place or
Grid.
methods. Using None causes problems if the destructor is called after
the __builtin__ module has already been destroyed (unfortunately, this
can happen!). I can't just delete the object because it is actually
tested for (if self._sock: ...). Setting it to 0 is a bit weird but
works.
There are two ways to use this -- as a filter (e.g. using C-U M-| on a
regex string literal in an Emacs buffer) or from a Python program
which imports this as a module. Read the doc string for more info,
and also some caveats (some cases aren't handled right).
Also change all occurrences of "x == None" to "x is None" (not that it
matters much, these functions are all reimplemented in strop -- but
count() is not).
The new re module was written by Andrew Kuchling and uses the pcre
code in ../Modules/. The old re module has been renamed to re1,
just in case you need it for comparison.
with an instance of a derived class B would really raise an A, not a
B. Since Barry fixed this anomalous behaviour, I though I might as
well fix the test! (Hmm, Barry, did you not run the tests or did you
miss that test_opcodes failed?)
os.fdopen() calls unbuffered. I presume that it's enough if we can
make all three of them (for stdin, stdout, and stderr) unbuffered and
don't need to specify different buffer sizes per file -- that would
complicate the interface more than I care for.
Apparently the traceback object doesn't contains the right linenumber
when -O is used. Rather than guessing whether -O is on or off, use
tb_lineno() unconditionally.
When completing a simple identifier, it completes keywords, built-ins
and globals in __main__; when completing NAME.NAME..., it evaluates
(!) the expression up to the last dot and completes its attributes.
It's very cool to do "import string" type "string.", hit the
completion key (twice), and see the list of names defined by the
string module!
Tip: to use the tab key as the completion key, call
readline.parse_and_bind("tab: complete")
- Don't use "from copy_reg import *".
- Use cls.__module__ instead of calling whichobject(cls, cls.__name__);
also try __module__ in whichmodule(), just in case.
- After calling save_reduce(), add the object to the memo.
Guido van Rossum
Barry Warsaw
Fred Drake