Re: tuple to string?
Francois De Serres wrote:
hiho,
what's the clean way to translate the tuple (0x73, 0x70, 0x61, 0x6D) to
the string 'spam'?
TIA,
Francois
thanks to all!
I'll pick ('%c' * len(t)) % t, for it's readability and the fact that
join() is on the deprec'd list.
Francois
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Re: tuple to string?
Steven D'Aprano wrote: On Sat, 23 Jul 2005 23:26:19 +1000, John Machin wrote: Steven D'Aprano wrote: ''.join(map(lambda n: chr(n), (0x73, 0x70, 0x61, 0x6D))) 'spam' Why the verbal diarrhoea? One line is hardly verbal diarrhoea. What's wrong with the (already posted) ''.join(map(chr, (0x73, 0x70, 0x61, 0x6D))) ??? Nothing. If I had seen the already posted solution using chr on its own without lambda, I wouldn't have bothered posting the lambda solution. But I didn't, so I did. As another poster has already pointed out, lambda cries out for over-use, and this was a perfect example of it. Here are a couple of reductions you can use in future, in the order given: (1) lambda args: foo(args) - foo # for *any* function foo, not just chr (2) lambda args: almost_any_guff - def meaningful_func_name(args): almost_any_guff -- http://mail.python.org/mailman/listinfo/python-list
Re: tuple to string?
Steven D'Aprano wrote: On Sat, 23 Jul 2005 23:31:04 +1000, John Machin wrote: You don't need the sissy parentheses; '%c' * len(t) % t works just fine :-) Ah, ok. Didn't want to lookup the precedence rules... Look up the precedence rules? Are you aware of any language where * / and % _don't_ have the same precedence?? Do languages like Pascal that don't have string formatting expressions, or use the % operator, count? A thousand pardons; I should have said Are you aware of any language which has % (as primarily a numeric remainder/modulo operator) but * / and % _don't_ have the same precedence?? OK, given a language which does have * and / used among other things for numerical multiply and divide, (a) are you aware of any such language which does does not have * and / at the same precedence level (b) supposing one wanted to introduce % as a numerical remainder/modulo/whatever operator (plus other meaning(s) for non-numeric types), would you care to argue that it should not have the same precedence level (as * and /)? Pascal was/is a prime example of bad precedence choice: a b or c d means a (b or c) d in Pascal (not very useful) and (a b) or (c d) in many other languages. How about languages like Forth that don't have precedence rules at all, unless first come, first served is a precedence rule? No precedence rules - no relevance to the topic -- http://mail.python.org/mailman/listinfo/python-list
Re: tuple to string?
Francois De Serres wrote:
Francois De Serres wrote:
hiho,
what's the clean way to translate the tuple (0x73, 0x70, 0x61, 0x6D)
to the string 'spam'?
TIA,
Francois
thanks to all!
I'll pick ('%c' * len(t)) % t, for it's readability and the fact that
join() is on the deprec'd list.
I presume you mean deprecated.
AFAIK there is no such thing as a deprecated list.
Certain constructs cause a deprecation warning to be emitted at run time
-- like passing a float argument where an int is expected.
Other constructs could be loosely described as deprecated because there
is now a better way to do it, but no messages are generated. This is so
for almost all of the functions in the string module. One example of
this is join: instead of string.join(alist, sep) one now does
sep.join(alist)
Given a non-string sequence of single characters, the
common/standard/well-known idiom for producing a string uses join; it is
''.join(seq)
Backing up to readability, I wouldn't have picked
('%c' * len(t)) % t (nor the version with 2 fewer parentheses!) as
particulary readable -- mainly because %c is AFAIK relatively little
used in Python and only someone familar with C etc would understand why
it works, or why it even exists. OTOH something like ''.join(chr(x) for
x in t) is made up of well-known frequently-used components.
Cheers,
John
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Re: tuple to string?
Francois De Serres wrote:
I'll pick ('%c' * len(t)) % t, for it's readability and the fact that
join() is on the deprec'd list.
''.join() is certainly not deprecated. What made you think that?
--
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[EMAIL PROTECTED]
In the fields of hell where the grass grows high
Are the graves of dreams allowed to die.
-- Richard Harter
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Re: tuple to string?
Robert Kern wrote:
Francois De Serres wrote:
I'll pick ('%c' * len(t)) % t, for it's readability and the fact that
join() is on the deprec'd list.
''.join() is certainly not deprecated. What made you think that?
this:
http://www.python.org/doc/2.4.1/lib/node110.html
but I now realize it's a different version of join() that was proposed
here...
thank you,
Francois
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Re: tuple to string?
On Sun, 24 Jul 2005 21:55:19 +1000, John Machin wrote: Look up the precedence rules? Are you aware of any language where * / and % _don't_ have the same precedence?? Do languages like Pascal that don't have string formatting expressions, or use the % operator, count? A thousand pardons; I should have said Are you aware of any language which has % (as primarily a numeric remainder/modulo operator) but * / and % _don't_ have the same precedence?? [slaps head] Ah, I had completely forgotten that Pascal has a MOD operator that is equivalent to % and has the same precedence as * / and DIV. So scratch Pascal off the list. But APL uses right-to-left precedence for all operators, and Forth uses left-to-right. There may be others. OK, given a language which does have * and / used among other things for numerical multiply and divide, (a) are you aware of any such language which does does not have * and / at the same precedence level (b) supposing one wanted to introduce % as a numerical remainder/modulo/whatever operator (plus other meaning(s) for non-numeric types), would you care to argue that it should not have the same precedence level (as * and /)? Yes I would. Since the remainder (or modulo) operator is not distributive, the only unambiguous usage is to use parentheses, or to decide on precedence rules. The usual mathematical convention is that modulus has lower precedence than addition, eg in clock arithmetic we expect that three hours after ten is one: 10+3 modulo 12 is 1, not 13. -- Steven. -- http://mail.python.org/mailman/listinfo/python-list
Re: tuple to string?
John Machin wrote: No precedence rules - no relevance to the topic Precedence rules of other languages - no relevance to the topic -- Robert Kern [EMAIL PROTECTED] In the fields of hell where the grass grows high Are the graves of dreams allowed to die. -- Richard Harter -- http://mail.python.org/mailman/listinfo/python-list
Re: tuple to string?
On Sun, 24 Jul 2005 10:39:44 -0700, Robert Kern wrote: John Machin wrote: No precedence rules - no relevance to the topic Precedence rules of other languages - no relevance to the topic I thought the topic was -- or at least had wandered in the direction of -- whether or not it was unthinkable for the precedence of % to be anything but that of multiplication and division. Surely the precedence rules of other languages have some relevance to that question. Still, the subject is rapidly losing whatever interest it may have had. -- Steven. -- http://mail.python.org/mailman/listinfo/python-list
Re: tuple to string?
Steven D'Aprano wrote: Still, the subject is rapidly losing whatever interest it may have had. It had none. Kill it. Kill the witch! -- http://mail.python.org/mailman/listinfo/python-list
Re: tuple to string?
John Machin wrote:
Reinhold Birkenfeld wrote:
Berthold Höllmann wrote:
Francois De Serres [EMAIL PROTECTED] writes:
hiho,
what's the clean way to translate the tuple (0x73, 0x70, 0x61, 0x6D)
to the string 'spam'?
. t = (0x73, 0x70, 0x61, 0x6D)
. ''.join('%c' % c for c in t)
'spam'
Or:
t = (0x73, 0x70, 0x61, 0x6D)
('%c' * len(t)) % t
You don't need the sissy parentheses; '%c' * len(t) % t works just fine :-)
Ah, ok. Didn't want to lookup the precedence rules...
Reinhold
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Re: tuple to string?
On Fri, 22 Jul 2005 06:07:28 -0700, Robert Kern wrote: Francois De Serres wrote: hiho, what's the clean way to translate the tuple (0x73, 0x70, 0x61, 0x6D) to the string 'spam'? In [1]: t = (0x73, 0x70, 0x61, 0x6D) In [2]: ''.join(chr(x) for x in t) Out[2]: 'spam' I get a syntax error when I try that. I guess anyone who hasn't started using Python 2.4 will also get the same error. Since t is just a tuple, there isn't a big advantage as far as I can see to build up and dispose of the generator machinery just for grabbing the next item in a tuple. So a list comprehension will work just as well, and in older versions of Python: ''.join([chr(x) for x in (0x73, 0x70, 0x61, 0x6D)]) For an even more version-independent method: L = [] for n in (0x73, 0x70, 0x61, 0x6D): L.append(chr(n)) print ''.join(L) or even: ''.join(map(lambda n: chr(n), (0x73, 0x70, 0x61, 0x6D))) 'spam' -- Steven. -- http://mail.python.org/mailman/listinfo/python-list
Re: tuple to string?
Steven D'Aprano wrote: On Fri, 22 Jul 2005 06:07:28 -0700, Robert Kern wrote: ... or even: ''.join(map(lambda n: chr(n), (0x73, 0x70, 0x61, 0x6D))) 'spam' This is exactly what is wrong with lambda. It yearns for over-use. This last should be: ''.join(map(chr, (0x73, 0x70, 0x61, 0x6D))) --Scott David Daniels [EMAIL PROTECTED] -- http://mail.python.org/mailman/listinfo/python-list
Re: tuple to string?
Steven D'Aprano wrote: ''.join(map(lambda n: chr(n), (0x73, 0x70, 0x61, 0x6D))) 'spam' Why the verbal diarrhoea? What's wrong with the (already posted) ''.join(map(chr, (0x73, 0x70, 0x61, 0x6D))) ??? -- http://mail.python.org/mailman/listinfo/python-list
Re: tuple to string?
Reinhold Birkenfeld wrote:
John Machin wrote:
Reinhold Birkenfeld wrote:
Berthold Höllmann wrote:
Francois De Serres [EMAIL PROTECTED] writes:
hiho,
what's the clean way to translate the tuple (0x73, 0x70, 0x61, 0x6D)
to the string 'spam'?
. t = (0x73, 0x70, 0x61, 0x6D)
. ''.join('%c' % c for c in t)
'spam'
Or:
t = (0x73, 0x70, 0x61, 0x6D)
('%c' * len(t)) % t
You don't need the sissy parentheses; '%c' * len(t) % t works just fine :-)
Ah, ok. Didn't want to lookup the precedence rules...
Look up the precedence rules? Are you aware of any language where * /
and % _don't_ have the same precedence??
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Re: tuple to string?
John Machin wrote: Reinhold Birkenfeld wrote: Ah, ok. Didn't want to lookup the precedence rules... Look up the precedence rules? Are you aware of any language where * / and % _don't_ have the same precedence?? Given that % is somewhat more esoteric, I certainly have never committed to memory its position in a precedence hierarchy of *any* language. -- Robert Kern [EMAIL PROTECTED] In the fields of hell where the grass grows high Are the graves of dreams allowed to die. -- Richard Harter -- http://mail.python.org/mailman/listinfo/python-list
Re: tuple to string?
On Sat, 23 Jul 2005 23:26:19 +1000, John Machin wrote: Steven D'Aprano wrote: ''.join(map(lambda n: chr(n), (0x73, 0x70, 0x61, 0x6D))) 'spam' Why the verbal diarrhoea? One line is hardly verbal diarrhoea. What's wrong with the (already posted) ''.join(map(chr, (0x73, 0x70, 0x61, 0x6D))) ??? Nothing. If I had seen the already posted solution using chr on its own without lambda, I wouldn't have bothered posting the lambda solution. But I didn't, so I did. As another poster has already pointed out, lambda cries out for over-use, and this was a perfect example of it. -- Steven. -- http://mail.python.org/mailman/listinfo/python-list
Re: tuple to string?
On Sat, 23 Jul 2005 23:31:04 +1000, John Machin wrote: You don't need the sissy parentheses; '%c' * len(t) % t works just fine :-) Ah, ok. Didn't want to lookup the precedence rules... Look up the precedence rules? Are you aware of any language where * / and % _don't_ have the same precedence?? Do languages like Pascal that don't have string formatting expressions, or use the % operator, count? How about languages like Forth that don't have precedence rules at all, unless first come, first served is a precedence rule? I'm not being academic here. I have used both these languages extensively, admittedly many years ago. -- Steven. -- http://mail.python.org/mailman/listinfo/python-list
Re: tuple to string?
''.join((chr(e) for e in (0x73, 0x70, 0x61, 0x6D))) -- http://mail.python.org/mailman/listinfo/python-list
Re: tuple to string?
Francois De Serres wrote: hiho, what's the clean way to translate the tuple (0x73, 0x70, 0x61, 0x6D) to the string 'spam'? In [1]: t = (0x73, 0x70, 0x61, 0x6D) In [2]: ''.join(chr(x) for x in t) Out[2]: 'spam' -- Robert Kern [EMAIL PROTECTED] In the fields of hell where the grass grows high Are the graves of dreams allowed to die. -- Richard Harter -- http://mail.python.org/mailman/listinfo/python-list
Re: tuple to string?
Francois De Serres wrote: hiho, what's the clean way to translate the tuple (0x73, 0x70, 0x61, 0x6D) to the string 'spam'? mytuple = (0x73, 0x70, 0x61, 0x6D) ''.join(chr(v) for v in mytuple) 'spam' -- http://mail.python.org/mailman/listinfo/python-list
Re: tuple to string?
Francois De Serres wrote: hiho, what's the clean way to translate the tuple (0x73, 0x70, 0x61, 0x6D) to the string 'spam'? one way is to use a list expression: ''.join([chr(c) for c in (0x73, 0x70, 0x61, 0x6D)]) 'spam' another is to use map: ''.join(map(chr, (0x73, 0x70, 0x61, 0x6D))) 'spam' HTH, deelan. -- deelan, #1 fan of adriana lima! http://www.deelan.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: tuple to string?
On 7/22/05, Francois De Serres [EMAIL PROTECTED] wrote:
what's the clean way to translate the tuple (0x73, 0x70, 0x61, 0x6D) to
the string 'spam'?
Use ''.join and chr() as others have pointed out. Here are
just-for-fun versions ;)
. t = (0x73, 0x70, 0x61, 0x6D)
(use string formatter):
. '%c%c%c%c' % t
'spam'
(use struct model):
. import struct
. struct.pack('', *t)
'spam'
--
Qiangning Hong
I'm usually annoyed by IDEs because, for instance, they don't use VIM
as an editor. Since I'm hooked to that, all IDEs I've used so far have
failed to impress me.
-- Sybren Stuvel @ c.l.python
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Re: tuple to string?
Francois De Serres wrote:
hiho,
what's the clean way to translate the tuple (0x73, 0x70, 0x61, 0x6D) to
the string 'spam'?
Use ''.join and chr() as others have pointed out. Here are just-for-fun
versions ;)
. t = (0x73, 0x70, 0x61, 0x6D)
(use string formatter):
. '%c%c%c%c' % t
'spam'
(use struct model):
. import struct
. struct.pack('', *t)
'spam'
--
Qiangning Hong
I'm usually annoyed by IDEs because, for instance, they don't use VIM
as an editor. Since I'm hooked to that, all IDEs I've used so far have
failed to impress me.
-- Sybren Stuvel @ c.l.python
Get Firefox!
http://www.spreadfirefox.com/?q=affiliatesamp;id=67907amp;t=1
--
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Re: tuple to string?
Francois De Serres [EMAIL PROTECTED] writes:
hiho,
what's the clean way to translate the tuple (0x73, 0x70, 0x61, 0x6D)
to the string 'spam'?
. t = (0x73, 0x70, 0x61, 0x6D)
. ''.join('%c' % c for c in t)
'spam'
--
Es gelten die Regeln der christlichen Seefahrt: Rot und Grün markiert
das sichere Fahrwasser, Schwarz und Gelb markieren Untiefen und
Wracks.
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Re: tuple to string?
Berthold Höllmann wrote:
Francois De Serres [EMAIL PROTECTED] writes:
hiho,
what's the clean way to translate the tuple (0x73, 0x70, 0x61, 0x6D)
to the string 'spam'?
. t = (0x73, 0x70, 0x61, 0x6D)
. ''.join('%c' % c for c in t)
'spam'
Or:
t = (0x73, 0x70, 0x61, 0x6D)
('%c' * len(t)) % t
Reinhold
--
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Re: tuple to string?
Reinhold Birkenfeld wrote:
Berthold Höllmann wrote:
Francois De Serres [EMAIL PROTECTED] writes:
hiho,
what's the clean way to translate the tuple (0x73, 0x70, 0x61, 0x6D)
to the string 'spam'?
. t = (0x73, 0x70, 0x61, 0x6D)
. ''.join('%c' % c for c in t)
'spam'
Or:
t = (0x73, 0x70, 0x61, 0x6D)
('%c' * len(t)) % t
You don't need the sissy parentheses; '%c' * len(t) % t works just fine :-)
--
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Re: tuple to string?
QH On 7/22/05, Francois De Serres [EMAIL PROTECTED] wrote: what's the clean way to translate the tuple (0x73, 0x70, 0x61, 0x6D) to the string 'spam'? QH Use ''.join and chr() as others have pointed out. Here are QH just-for-fun versions ;) . t = (0x73, 0x70, 0x61, 0x6D) QH (use string formatter): . '%c%c%c%c' % t Or more generally: t = (0x73, 0x70, 0x61, 0x6D) '%c'*len(t) % t 'spam' but that's VERY perlonic python. Still, it's a technique that can come in handy when building, say, SQL queries on the fly. -- Patricia J. Hawkins Hawkins Internet Applications www.hawkinsia.com -- http://mail.python.org/mailman/listinfo/python-list
