Mailman 3 May 2006 - Python-Dev

Charles Waldman?
by Monica Kendall 22 May '06

22 May '06

Hi Skip, Did you ever find Charles Waldman? We are looking for him too. Monica

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Re: [Python-Dev] [Python-checkins] r46043 - peps/trunk/pep-0356.txt
by Delaney, Timothy (Tim) 22 May '06

22 May '06

Steve Holden wrote: > Will it be acceptable to add new (performance) changes between Alpha 3 > and beta 1, or would developers prefer to put a fourth alpha in to the > schedule? > > The intention is there should be no major functionality added by the > sprint, simply that performance should be improved, so the schedule > may work. It's just a call for the release manager really, I guess. If there's no functionality changes, what would be the problem with putting it in post-alpha? Tim Delaney

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Re: [Python-Dev] New string method - splitquoted
by Dave Cinege 20 May '06

20 May '06

On Thursday 18 May 2006 16:13, you wrote: > Dave Cinege wrote: > > For example: > > > > s = ' Chan: 11 SNR: 22 ESSID: "Spaced Out Wifi" Enc: On' > > My complaint with this example is that you are just using the wrong tool > to do this job. If I was going to do this, I would've immediately jumped > on the regex-press train. > > wifi_info = re.match('^\s+' > 'Chan:\s+(?P<channel>[0-9]+)\s+' > 'SNR:\s+(?P<snr>[0-9]+)\s+' > 'ESSID:\s+"(?P<essid>[^"]*)"\s+' > 'Enc:\s+(?P<encryption>[a-zA-Z]+)' > , s) For the 5 years of been pythoning, I've used re probably twice. I find regex to be a tool of last resort, and quite a bit of effort to get right, as regex (for me) is quite prone it giving unintended results without a good deal of thought. I don't want to have to think. That's why I use python. : ) .split() and slicing has always been python's holy grail for me, and I find it a lot easier to .replace() 'stray' chars with spaces or a delimiter and then split() that. It's easier to read and (should be) a lot quicker to process then regex. (Which I care about, as I'm also often on embedded CPU's of a few hundred MHz) So .split works just super duper.....but I keep running in to situations where I'd like a substr to be excluded from the split'ing. The clearest one is excluding a 'quoted' string that has whitespace. Here's another, be it, a very poor example: s = '\t\tFrequency:2.462 GHz (Channel 11)' # This is real output from iwlist: s.replace(':',')').replace(' (','))').split(None,-1,')') ['Frequency', '2.462 GHz', 'Channel 11'] I wanted to preserve the '2.462 GHz' substr. Let's assume, that could come out as '900 MHz' or '11.3409 GHz'. The above code gets what I want in 1 shot, either way. Show me an easier way, that doesn't need multiple splits, and string re-assembly, ....and I'll use it. Dave

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Weekly Python Patch/Bug Summary
by Kurt B. Kaiser 20 May '06

20 May '06

Patch / Bug Summary ___________________ Patches : 378 open ( +0) / 3238 closed (+22) / 3616 total (+22) Bugs : 907 open (+13) / 5831 closed (+20) / 6738 total (+33) RFE : 218 open ( +2) / 217 closed ( +2) / 435 total ( +4) New / Reopened Patches ______________________ Patch fixing #1481770 (wrong shared lib ext on hpux ia64) (2006-05-07) CLOSED http://python.org/sf/1483325 opened by David Everly Add new top-level domains to cookielib (2006-05-07) CLOSED http://python.org/sf/1483395 reopened by jjlee Add new top-level domains to cookielib (2006-05-07) CLOSED http://python.org/sf/1483395 opened by John J Lee Wave.py support for ulaw and alaw audio (2006-05-07) http://python.org/sf/1483545 opened by Eric Woudenberg tarfile.py fix for #1471427 and updates (2006-05-09) CLOSED http://python.org/sf/1484695 opened by Lars Gustäbel cookielib: reduce (fatal) dependency on "beta" logging? (2006-05-09) CLOSED http://python.org/sf/1484758 opened by kxroberto urllib2: resolves extremly slow import (of "everything") (2006-05-09) CLOSED http://python.org/sf/1484793 opened by kxroberto HTMLParser : A auto-tolerant parsing mode (2006-05-11) http://python.org/sf/1486713 opened by kxroberto Patches and enhancements to turtle.py (2006-05-11) CLOSED http://python.org/sf/1486962 opened by Vern Ceder MacOSX: distutils support for -arch and -isysroot flags (2006-05-13) http://python.org/sf/1488098 opened by Ronald Oussoren Memory alignment fix on SPARC (2006-05-14) CLOSED http://python.org/sf/1488312 opened by Jan Palus tarfile.py: support for file-objects and bz2 (cp. #1488634) (2006-05-15) CLOSED http://python.org/sf/1488881 opened by Lars Gustäbel Updates to syntax rules in reference manual (2006-05-16) http://python.org/sf/1489771 opened by iga Seilnacht Patch for the urllib2 HOWTO (2006-05-16) CLOSED http://python.org/sf/1489784 opened by Mike Foord fix typo in os.utime() docstring (2006-05-17) CLOSED http://python.org/sf/1490189 opened by M. Levinson add os.chflags() and os.lchflags() where available (2006-05-17) http://python.org/sf/1490190 opened by M. Levinson time.altzone does not include DST offset on Cygwin (2006-05-17) CLOSED http://python.org/sf/1490224 opened by Christian Franke PC new-logo-based icon set (2006-05-17) http://python.org/sf/1490384 opened by Andrew Clover Describe Py_DEBUG and friends... (2006-05-18) http://python.org/sf/1490989 opened by Skip Montanaro IDLE L&F on MacOSX (2006-05-19) http://python.org/sf/1491759 opened by Ronald Oussoren Simple slice support for list.sort() and .reverse() (2006-05-19) http://python.org/sf/1491804 opened by Heiko Wundram Complex representation (2006-05-19) http://python.org/sf/1491866 opened by Heiko Wundram Fix for bug #1486663 mutable types check kwargs in tp_new (2006-05-20) http://python.org/sf/1491939 opened by iga Seilnacht Patches Closed ______________ applesingle endianness issue (2004-06-30) http://python.org/sf/982340 closed by gbrandl Patch fixing #1481770 (wrong shared lib ext on hpux ia64) (2006-05-07) http://python.org/sf/1483325 closed by loewis Add new top-level domains to cookielib (2006-05-07) http://python.org/sf/1483395 closed by gbrandl Add new top-level domains to cookielib (2006-05-07) http://python.org/sf/1483395 closed by gbrandl Heavy revisions to urllib2 howto (2006-05-01) http://python.org/sf/1479977 closed by akuchling Make urllib2 digest auth and basic auth play together (2006-04-30) http://python.org/sf/1479302 closed by gbrandl Take advantage of BaseException/Exception split in cookielib (2006-04-29) http://python.org/sf/1478993 closed by gbrandl tarfile.py fix for #1471427 and updates (2006-05-09) http://python.org/sf/1484695 closed by gbrandl cookielib: reduce (fatal) dependency on "beta" logging? (2006-05-09) http://python.org/sf/1484758 closed by gbrandl urllib2: resolves extremly slow import (of "everything") (2006-05-09) http://python.org/sf/1484793 closed by gbrandl Fix doctest nit. (2006-04-28) http://python.org/sf/1478292 closed by tim_one Remote debugging with pdb.py (2003-04-14) http://python.org/sf/721464 closed by gbrandl urllib2: better import ftplib and gopherlib etc late (2004-10-24) http://python.org/sf/1053150 closed by loewis detect %zd format for PY_FORMAT_SIZE_T (2006-04-22) http://python.org/sf/1474907 closed by bcannon Patches and enhancements to turtle.py (2006-05-11) http://python.org/sf/1486962 closed by gbrandl Improve docs for tp_clear and tp_traverse (2006-04-19) http://python.org/sf/1473132 closed by tim_one Memory alignment fix on SPARC (2006-05-14) http://python.org/sf/1488312 closed by nnorwitz tarfile.py: support for file-objects and bz2 (cp. #1488634) (2006-05-15) http://python.org/sf/1488881 closed by gbrandl Add copy() method to zlib's compress and decompress objects (2006-02-20) http://python.org/sf/1435422 closed by gbrandl Patch for the urllib2 HOWTO (2006-05-16) http://python.org/sf/1489784 closed by gbrandl fix typo in os.utime() docstring (2006-05-17) http://python.org/sf/1490189 closed by gbrandl time.altzone does not include DST offset on Cygwin (2006-05-17) http://python.org/sf/1490224 closed by gbrandl great improvement for locale.py formatting functions (2005-04-10) http://python.org/sf/1180296 closed by gbrandl New / Reopened Bugs ___________________ docs for 'profile' should refer to pstats.Stats (2006-05-06) CLOSED http://python.org/sf/1482988 opened by Ori Peleg Objects/genobject.c:53: gen_iternext: Assertion `f->f_back ! (2006-05-07) http://python.org/sf/1483133 opened by svensoho Add set.member() method (2006-05-07) CLOSED http://python.org/sf/1483384 opened by Michael Tsai Doctest bug (2006-05-08) CLOSED http://python.org/sf/1483785 opened by stnsls struct.unpack problem with @, =, < specifiers (2006-05-08) http://python.org/sf/1483963 opened by Christian Hudon pydoc doesn't create html-file (2006-05-08) CLOSED http://python.org/sf/1483997 opened by Gregor Lingl hyper-threading locks up sleeping threads (2006-05-08) http://python.org/sf/1484172 opened by Olaf Meding Output of KlocWork on Python2.4.3 sources (2006-05-09) http://python.org/sf/1484556 opened by Miki Tebeka ctypes documenation obscure and incomplete (2006-05-09) http://python.org/sf/1484580 opened by Nicko van Someren Doc for new_panel() missing scope info (2006-05-09) CLOSED http://python.org/sf/1484978 opened by Troels Therkelsen The name is qmail, not Qmail (2006-05-09) CLOSED http://python.org/sf/1485280 opened by David Phillips subprocess.Popen + cwd + relative args[0] (2006-05-10) CLOSED http://python.org/sf/1485447 opened by Mark Sheppard httplib: read/_read_chunked failes with ValueError sometime (2006-05-11) http://python.org/sf/1486335 opened by kxroberto Over-zealous keyword-arguments check for built-in set class (2006-05-11) http://python.org/sf/1486663 opened by dib OS X framework build for python 2.5 fails, configure is odd (2006-05-11) http://python.org/sf/1486897 opened by Christopher Knox No examples or usage docs for urllib2 (2004-04-29) CLOSED http://python.org/sf/944394 reopened by fresh 2.5 rev 45972 fails build on Mac-Intel (2006-05-12) http://python.org/sf/1487105 opened by Alex Martelli datetime.time and datetime.timedelta (2006-05-12) http://python.org/sf/1487389 opened by Chris Withers can't pickle slice objects (2006-05-12) http://python.org/sf/1487420 opened by ganges master Could BIND_FIRST be removed on HP-UX? (2006-05-12) http://python.org/sf/1487481 opened by Göran Uddeborg SystemError with conditional expression in assignment (2006-05-13) CLOSED http://python.org/sf/1487966 opened by iga Seilnacht tarfile.TarFile.open can might incorrectly raise ValueError (2006-05-15) CLOSED http://python.org/sf/1488634 opened by Andrew Bennetts appended file on Windows reads arbitrary data (2006-05-15) CLOSED http://python.org/sf/1488717 opened by muimi appended file on Windows reads arbitrary data (2006-05-15) CLOSED http://python.org/sf/1488779 opened by muimi endless loop in PyCFunction_Fini() (2006-05-15) http://python.org/sf/1488906 opened by Matejcik Multiple dots in relative import statement raise SyntaxError (2006-05-15) http://python.org/sf/1488915 opened by iga Seilnacht file.write + closed pipe (2006-05-15) http://python.org/sf/1488934 opened by Erik Demaine difflib.Differ() doesn't always add hints for tab characters (2006-05-16) http://python.org/sf/1488943 opened by Henry keyword and topic help broken in Pythonwin IDE (2006-05-15) http://python.org/sf/1489051 opened by BartlebyScrivener 2.4.3 fails to find Tcl/Tk on Solaris 10 x86_64 (2006-05-15) http://python.org/sf/1489246 opened by Tim Mooney time module missing from global mod index (2006-05-16) http://python.org/sf/1489648 opened by Skip Montanaro %g incorrect conversion (2006-05-18) CLOSED http://python.org/sf/1490688 opened by paul rubin urllib.retrieve's reporthook called with non-helpful value (2006-05-18) http://python.org/sf/1490929 opened by Sidnei da Silva glob_to_re problems (2006-05-19) http://python.org/sf/1491431 opened by Wayne Davison argvemulator doesn't work on intel mac (2006-05-19) http://python.org/sf/1491468 opened by Ronald Oussoren distutils adds (unwanted) -xcode=pic32 in the compile comman (2006-05-19) http://python.org/sf/1491574 opened by Toon Knapen Pickle & schizofrenic classes don't match (2006-05-19) CLOSED http://python.org/sf/1491688 opened by Ronald Oussoren Bugs Closed ___________ asyncore is not listed in test_sundry (2006-05-05) http://python.org/sf/1482746 closed by gbrandl docs for 'profile' should refer to pstats.Stats (2006-05-06) http://python.org/sf/1482988 closed by gbrandl tarfile.py chokes on long names (2006-04-16) http://python.org/sf/1471427 closed by gbrandl hpux ia64 shared lib ext should be ".so" (2006-05-04) http://python.org/sf/1481770 closed by nnorwitz Doctest bug (2006-05-08) http://python.org/sf/1483785 deleted by stnsls pydoc doesn't create html-file (2006-05-08) http://python.org/sf/1483997 closed by gbrandl ctypes extension does not compile on Mac OS 10.3.9 (2006-03-29) http://python.org/sf/1460514 closed by theller Doc for new_panel() missing scope info (2006-05-09) http://python.org/sf/1484978 closed by gbrandl Python does not check for POSIX compliant open() modes (2006-03-31) http://python.org/sf/1462152 closed by gbrandl Building without C++ should not fail. (2005-12-26) http://python.org/sf/1390321 closed by loewis The name is qmail, not Qmail (2006-05-10) http://python.org/sf/1485280 closed by gbrandl subprocess.Popen + cwd + relative args[0] (2006-05-10) http://python.org/sf/1485447 closed by gbrandl urllib2: better import ftplib and gopherlib etc late (2004-10-13) http://python.org/sf/1046077 closed by loewis No examples or usage docs for urllib2 (2004-04-29) http://python.org/sf/944394 closed by loewis No examples or usage docs for urllib2 (04/29/04) http://python.org/sf/944394 closed by sf-robot long path support in win32 part of os.listdir(posixmodule.c) (2006-02-14) http://python.org/sf/1431582 closed by loewis SystemError with conditional expression in assignment (2006-05-13) http://python.org/sf/1487966 closed by nnorwitz subprocess _active.remove(self) self not in list _active (05/10/05) http://python.org/sf/1199282 closed by sf-robot tarfile.TarFile.open can might incorrectly raise ValueError (2006-05-15) http://python.org/sf/1488634 closed by gbrandl appended file on Windows reads arbitrary data (2006-05-15) http://python.org/sf/1488717 closed by tim_one appended file on Windows reads arbitrary data (2006-05-15) http://python.org/sf/1488779 closed by gbrandl %g incorrect conversion (2006-05-18) http://python.org/sf/1490688 closed by gbrandl non-keyword argument following keyword (2006-04-22) http://python.org/sf/1474677 closed by nnorwitz Pickle & schizofrenic classes don't match (2006-05-19) http://python.org/sf/1491688 closed by ronaldoussoren New / Reopened RFE __________________ Backwards compatibility support for Py_ssize_t (2006-05-10) http://python.org/sf/1485576 opened by Konrad Hinsen str.startswith/endswith could take a tuple? (2006-05-19) http://python.org/sf/1491485 opened by Tom Lynn RFE Closed __________ Add set.member() method (2006-05-07) http://python.org/sf/1483384 closed by rhettinger Drop py.ico and pyc.ico (2006-04-27) http://python.org/sf/1477968 closed by loewis

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PEP 3101 Update
by Talin 19 May '06

19 May '06

I've updated PEP 3101 based on the feedback collected so far. --------------------- PEP: 3101 Title: Advanced String Formatting Version: $Revision: 45928 $ Last-Modified: $Date: 2006-05-06 18:49:43 -0700 (Sat, 06 May 2006) $ Author: Talin <talin at acm.org> Status: Draft Type: Standards Content-Type: text/plain Created: 16-Apr-2006 Python-Version: 3.0 Post-History: 28-Apr-2006, 6-May-2006 Abstract This PEP proposes a new system for built-in string formatting operations, intended as a replacement for the existing '%' string formatting operator. Rationale Python currently provides two methods of string interpolation: - The '%' operator for strings. [1] - The string.Template module. [2] The scope of this PEP will be restricted to proposals for built-in string formatting operations (in other words, methods of the built-in string type). The '%' operator is primarily limited by the fact that it is a binary operator, and therefore can take at most two arguments. One of those arguments is already dedicated to the format string, leaving all other variables to be squeezed into the remaining argument. The current practice is to use either a dictionary or a tuple as the second argument, but as many people have commented [3], this lacks flexibility. The "all or nothing" approach (meaning that one must choose between only positional arguments, or only named arguments) is felt to be overly constraining. While there is some overlap between this proposal and string.Template, it is felt that each serves a distinct need, and that one does not obviate the other. In any case, string.Template will not be discussed here. Specification The specification will consist of 4 parts: - Specification of a new formatting method to be added to the built-in string class. - Specification of a new syntax for format strings. - Specification of a new set of class methods to control the formatting and conversion of objects. - Specification of an API for user-defined formatting classes. String Methods The build-in string class will gain a new method, 'format', which takes takes an arbitrary number of positional and keyword arguments: "The story of {0}, {1}, and {c}".format(a, b, c=d) Within a format string, each positional argument is identified with a number, starting from zero, so in the above example, 'a' is argument 0 and 'b' is argument 1. Each keyword argument is identified by its keyword name, so in the above example, 'c' is used to refer to the third argument. The result of the format call is an object of the same type (string or unicode) as the format string. Format Strings Brace characters ('curly braces') are used to indicate a replacement field within the string: "My name is {0}".format('Fred') The result of this is the string: "My name is Fred" Braces can be escaped using a backslash: "My name is {0} :-\{\}".format('Fred') Which would produce: "My name is Fred :-{}" The element within the braces is called a 'field'. Fields consist of a 'field name', which can either be simple or compound, and an optional 'conversion specifier'. Simple field names are either names or numbers. If numbers, they must be valid base-10 integers; if names, they must be valid Python identifiers. A number is used to identify a positional argument, while a name is used to identify a keyword argument. Compound names are a sequence of simple names seperated by periods: "My name is {0.name} :-\{\}".format(dict(name='Fred')) Compound names can be used to access specific dictionary entries, array elements, or object attributes. In the above example, the '{0.name}' field refers to the dictionary entry 'name' within positional argument 0. Each field can also specify an optional set of 'conversion specifiers' which can be used to adjust the format of that field. Conversion specifiers follow the field name, with a colon (':') character separating the two: "My name is {0:8}".format('Fred') The meaning and syntax of the conversion specifiers depends on the type of object that is being formatted, however many of the built-in types will recognize a standard set of conversion specifiers. The conversion specifier consists of a sequence of zero or more characters, each of which can consist of any printable character except for a non-escaped '}'. Conversion specifiers can themselves contain replacement fields; this will be described in a later section. Except for this replacement, the format() method does not attempt to intepret the conversion specifiers in any way; it merely passes all of the characters between the first colon ':' and the matching right brace ('}') to the various underlying formatters (described later.) Standard Conversion Specifiers For most built-in types, the conversion specifiers will be the same or similar to the existing conversion specifiers used with the '%' operator. Thus, instead of '%02.2x", you will say '{0:02.2x}'. There are a few differences however: - The trailing letter is optional - you don't need to say '2.2d', you can instead just say '2.2'. If the letter is omitted, a default will be assumed based on the type of the argument. The defaults will be as follows: string or unicode object: 's' integer: 'd' floating-point number: 'f' all other types: 's' - Variable field width specifiers use a nested version of the {} syntax, allowing the width specifier to be either a positional or keyword argument: "{0:{1}.{2}d}".format(a, b, c) - The support for length modifiers (which are ignored by Python anyway) is dropped. For non-built-in types, the conversion specifiers will be specific to that type. An example is the 'datetime' class, whose conversion specifiers are identical to the arguments to the strftime() function: "Today is: {0:%a %b %d %H:%M:%S %Y}".format(datetime.now()) Controlling Formatting A class that wishes to implement a custom interpretation of its conversion specifiers can implement a __format__ method: class AST: def __format__(self, specifiers): ... The 'specifiers' argument will be either a string object or a unicode object, depending on the type of the original format string. The __format__ method should test the type of the specifiers parameter to determine whether to return a string or unicode object. It is the responsibility of the __format__ method to return an object of the proper type. string.format() will format each field using the following steps: 1) See if the value to be formatted has a __format__ method. If it does, then call it. 2) Otherwise, check the internal formatter within string.format that contains knowledge of certain builtin types. 3) Otherwise, call str() or unicode() as appropriate. User-Defined Formatting Classes There will be times when customizing the formatting of fields on a per-type basis is not enough. An example might be an accounting application, which displays negative numbers in parentheses rather than using a negative sign. The string formatting system facilitates this kind of application- specific formatting by allowing user code to directly invoke the code that interprets format strings and fields. User-written code can intercept the normal formatting operations on a per-field basis, substituting their own formatting methods. For example, in the aforementioned accounting application, there could be an application-specific number formatter, which reuses the string.format templating code to do most of the work. The API for such an application-specific formatter is up to the application; here are several possible examples: cell_format( "The total is: {0}", total ) TemplateString( "The total is: {0}" ).format( total ) Creating an application-specific formatter is relatively straight- forward. The string and unicode classes will have a class method called 'cformat' that does all the actual work of formatting; The built-in format() method is just a wrapper that calls cformat. The parameters to the cformat function are: -- The format string (or unicode; the same function handles both.) -- A callable 'format hook', which is called once per field -- A tuple containing the positional arguments -- A dict containing the keyword arguments The cformat function will parse all of the fields in the format string, and return a new string (or unicode) with all of the fields replaced with their formatted values. The format hook is a callable object supplied by the user, which is invoked once per field, and which can override the normal formatting for that field. For each field, the cformat function will attempt to call the field format hook with the following arguments: format_hook(value, conversion, buffer) The 'value' field corresponds to the value being formatted, which was retrieved from the arguments using the field name. The 'conversion' argument is the conversion spec part of the field, which will be either a string or unicode object, depending on the type of the original format string. The 'buffer' argument is a Python array object, either a byte array or unicode character array. The buffer object will contain the partially constructed string; the field hook is free to modify the contents of this buffer if needed. The field_hook will be called once per field. The field_hook may take one of two actions: 1) Return False, indicating that the field_hook will not process this field and the default formatting should be used. This decision should be based on the type of the value object, and the contents of the conversion string. 2) Append the formatted field to the buffer, and return True. Alternate Syntax Naturally, one of the most contentious issues is the syntax of the format strings, and in particular the markup conventions used to indicate fields. Rather than attempting to exhaustively list all of the various proposals, I will cover the ones that are most widely used already. - Shell variable syntax: $name and $(name) (or in some variants, ${name}). This is probably the oldest convention out there, and is used by Perl and many others. When used without the braces, the length of the variable is determined by lexically scanning until an invalid character is found. This scheme is generally used in cases where interpolation is implicit - that is, in environments where any string can contain interpolation variables, and no special subsitution function need be invoked. In such cases, it is important to prevent the interpolation behavior from occuring accidentally, so the '$' (which is otherwise a relatively uncommonly-used character) is used to signal when the behavior should occur. It is the author's opinion, however, that in cases where the formatting is explicitly invoked, that less care needs to be taken to prevent accidental interpolation, in which case a lighter and less unwieldy syntax can be used. - Printf and its cousins ('%'), including variations that add a field index, so that fields can be interpolated out of order. - Other bracket-only variations. Various MUDs (Multi-User Dungeons) such as MUSH have used brackets (e.g. [name]) to do string interpolation. The Microsoft .Net libraries uses braces ({}), and a syntax which is very similar to the one in this proposal, although the syntax for conversion specifiers is quite different. [4] - Backquoting. This method has the benefit of minimal syntactical clutter, however it lacks many of the benefits of a function call syntax (such as complex expression arguments, custom formatters, etc.). - Other variations include Ruby's #{}, PHP's {$name}, and so on. Some specific aspects of the syntax warrant additional comments: 1) The use of the backslash character for escapes. A few people suggested doubling the brace characters to indicate a literal brace rather than using backslash as an escape character. This is also the convention used in the .Net libraries. Here's how the previously-given example would look with this convention: "My name is {0} :-{{}}".format('Fred') One problem with this syntax is that it conflicts with the use of nested braces to allow parameterization of the conversion specifiers: "{0:{1}.{2}}".format(a, b, c) (There are alternative solutions, but they are too long to go into here.) 2) The use of the colon character (':') as a separator for conversion specifiers. This was chosen simply because that's what .Net uses. Sample Implementation A rough prototype of the underlying 'cformat' function has been coded in Python, however it needs much refinement before being submitted. Backwards Compatibility Backwards compatibility can be maintained by leaving the existing mechanisms in place. The new system does not collide with any of the method names of the existing string formatting techniques, so both systems can co-exist until it comes time to deprecate the older system. References [1] Python Library Reference - String formating operations http://docs.python.org/lib/typesseq-strings.html [2] Python Library References - Template strings http://docs.python.org/lib/node109.html [3] [Python-3000] String formating operations in python 3k http://mail.python.org/pipermail/python-3000/2006-April/000285.html [4] Composite Formatting - [.Net Framework Developer's Guide] http://msdn.microsoft.com/library/en-us/cpguide/html/cpconcompositeformatti… Copyright This document has been placed in the public domain. Local Variables: mode: indented-text indent-tabs-mode: nil sentence-end-double-space: t fill-column: 70 coding: utf-8 End:

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Re: [Python-Dev] [Python-checkins] r46043 - peps/trunk/pep-0356.txt
by Steve Holden 19 May '06

19 May '06

neal.norwitz wrote: Please note that the "Need for Speed" sprint runs May 21 - 27. Bringing the schedule forward on Alpha 3 makes it less possible to incorporate sprint changes into the 2.5 trunk. Will it be acceptable to add new (performance) changes between Alpha 3 and beta 1, or would developers prefer to put a fourth alpha in to the schedule? The intention is there should be no major functionality added by the sprint, simply that performance should be improved, so the schedule may work. It's just a call for the release manager really, I guess. regards Steve > Author: neal.norwitz > Date: Fri May 19 06:34:02 2006 > New Revision: 46043 > > Modified: > peps/trunk/pep-0356.txt > Log: > Speed up schedule a bit, rc corresponds to OSCON. > Gerhard checked in docs for sqlite. > > > > Modified: peps/trunk/pep-0356.txt > ============================================================================== > --- peps/trunk/pep-0356.txt (original) > +++ peps/trunk/pep-0356.txt Fri May 19 06:34:02 2006 > @@ -38,11 +38,11 @@ > > alpha 1: April 5, 2006 [completed] > alpha 2: April 27, 2006 [completed] > - alpha 3: May 27, 2006 [planned] > - beta 1: June 24, 2006 [planned] > - beta 2: July 15, 2006 [planned] > - rc 1: August 5, 2006 [planned] > - final: August 19, 2006 [planned] > + alpha 3: May 25, 2006 [planned] > + beta 1: June 14, 2006 [planned] > + beta 2: July 6, 2006 [planned] > + rc 1: July 27, 2006 [planned] > + final: August 3, 2006 [planned] > > > Completed features for 2.5 > @@ -155,7 +155,6 @@ > - Missing documentation > * ctypes (Thomas Heller) > * ElementTree/cElementTree (Fredrik Lundh) > - * pysqlite (Gerhard Haering) > * setuptools (written, needs conversion to proper format) > > - AST compiler problems > _______________________________________________ > Python-checkins mailing list > Python-checkins(a)python.org > http://mail.python.org/mailman/listinfo/python-checkins > > > -- Steve Holden +44 150 684 7255 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Love me, love my blog http://holdenweb.blogspot.com Recent Ramblings http://del.icio.us/steve.holden

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Reminder: call for proposals "Python Language and Libraries Track" for Europython 2006
by Samuele Pedroni 19 May '06

19 May '06

Registration for Europython (3-5 July) at CERN in Geneva is now open, if you feel submitting a talk proposal there's still time until the 31th of May. If you want to talk about a library you developed, or you know well and want to share your knowledge, or about how you are making the best out of Python through inventive/elegant idioms and patterns (or if you are a language guru willing to disseminate your wisdom), you can submit a proposal for the Python Language and Libraries track """ A track about Python the Language, all batteries included. Talks about the language, language evolution, patterns and idioms, implementations (CPython, IronPython, Jython, PyPy ...) and implementation issues belong to the track. So do talks about the standard library or interesting 3rd-party libraries (and frameworks), unless the gravitational pull of other tracks is stronger. """ The full call and submission links are at: http://www.europython.org/sections/tracks_and_talks/call-for-proposals Samuele Pedroni, Python Language and Libraries Track Chair

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base64 module
by Sanghyeon Seo 18 May '06

18 May '06

Hello, base64 module documentation for b64decode function says, "TypeError is raised if s were incorrectly padded or if there are non-alphabet characters present in the string." But this doesn't seem to be the case. Testcase: import base64 base64.b64decode('%') Since % is a non-alphabet character, this should raise TypeError (btw, shouldn't this be ValueError instead?), but Python 2.4.3 silently ignores. I found this while experimenting with IronPython. IronPython 1.0 Beta 5 gives: Traceback (most recent call last): File base64, line unknown, in b64decode SystemError: cannot decode byte: '%' It's not TypeError, but it doesn't silently ignore either. Seo Sanghyeon

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New string method - splitquoted
by Dave Cinege 18 May '06

18 May '06

Very often....make that very very very very very very very very very often, I find myself processing text in python that when .split()'ing a line, I'd like to exclude the split for a 'quoted' item...quoted because it contains whitespace or the sep char. For example: s = ' Chan: 11 SNR: 22 ESSID: "Spaced Out Wifi" Enc: On' If I want to yank the essid in the above example, it's a pain. But with my new dandy split quoted method, we have a 3rd argument to .split() that we can spec the quote delimiter where no splitting will occur, and the quote char will be dropped: s.split(None,-1,'"')[5] 'Spaced Out Wifi' Attached is a proof of concept patch against Python-2.4.1/Objects/stringobject.c that implements this. It is limited to whitespace splitting only. (sep == None) As implemented the quote delimiter also doubles as an additional separator for the spliting out a substr. For example: 'There is"no whitespace before these"quotes'.split(None,-1,'"') ['There', 'is', 'no whitespace before these', 'quotes'] This is useful, but possibly better put into practice as a separate method?? Comments please. Dave

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MSVC 6.0 patch
by Luke Dunstan 17 May '06

17 May '06

Hi, This patch submitted in March allows Python trunk to be built using MSVC 6: http://sourceforge.net/tracker/index.php?func=detail&aid=1457736&group_id=5… It is not my patch but I am quite interested because the code changes are also required to build with MS eMbedded Visual C++ 4.0, the Windows CE 4.x compiler. I'm guessing that the person assigned to the patch is too busy so I hope somebody else can take over? Thanks, Luke

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