Re: Best way to delimit a list?
On May 13, 11:25 pm, Dennis Lee Bieber [EMAIL PROTECTED] wrote: On Tue, 13 May 2008 04:14:16 -0700 (PDT), [EMAIL PROTECTED] declaimed the following in comp.lang.python: So f is a list, rather than a file object, of which os.open would have returned (my initial typo redirected the missive of this post, sorry!) Other than the facet that os.open() is low-level C file object and not a Python file object... What you have returned is a list of lines... Hmmm, if os.popen() supports .readlines() it might even support direct iteration for ln in os.popen(): do something with the line Now the matter comes down to what each line looks like... It is NOT a list in Python terms, no matter what delimiters it has (and one of your examples doesn't even seem to be consistant -- [' ]' is not the same as [' '] ) For space separated hostnames for ln in os.popen(...): #assuming it works without a preread for host in ln.split(): do something with host... -- Wulfraed Dennis Lee Bieber KD6MOG [EMAIL PROTECTED] [EMAIL PROTECTED] HTTP://wlfraed.home.netcom.com/ (Bestiaria Support Staff: [EMAIL PROTECTED]) HTTP://www.bestiaria.com/ Compositions can't have names in the singular case. -- http://mail.python.org/mailman/listinfo/python-list
Re: Best way to delimit a list?
On May 13, 5:28 am, [EMAIL PROTECTED] wrote: Hi - I have a list returned from popen/readlines, and am wondering how to go about iterating over each item which was returned (rather than currently having the whole lot returned). so far: f=os.open(./get_hostnames).readlines returns ['host1 host2 host3 ... hostN\n]' i'd like to be in a position to iterate through these, grabbing each host. I have played with transmuting to a str, and using split, and this works, but I get the subscript brackets from the list output as expected, as the list output is now a string literal, and this is not what I want - and I think it's a bit long-winded to do a search 'n replace on it - hence why I ask in the subject what's the best way. f=str(f) f.split() [['host1,host2, ... ,hostN\n']] Any help is highly appreciated ta dan. Bring up the Google Ring. Where you only wiggle fingers, it might pay to get jobs at home. All we up here would have to do would be schedule something. Make a decision is easy in talking. I think it would be easy to centralize the time the world's at and redistribute money. If all we'd do is normal life, this constrained, open markets would be easy to set up. It's just illegal to talk about pricing in 2004 Microecon. classes. -- http://mail.python.org/mailman/listinfo/python-list
Re: Best way to delimit a list?
On May 13, 11:28 am, [EMAIL PROTECTED] wrote: Hi - I have a list returned from popen/readlines, and am wondering how to go about iterating over each item which was returned (rather than currently having the whole lot returned). so far: f=os.open(./get_hostnames).readlines returns ['host1 host2 host3 ... hostN\n]' i'd like to be in a position to iterate through these, grabbing each host. I have played with transmuting to a str, and using split, and this works, but I get the subscript brackets from the list output as expected, as the list output is now a string literal, and this is not what I want - and I think it's a bit long-winded to do a search 'n replace on it - hence why I ask in the subject what's the best way. f=str(f) f.split() [['host1,host2, ... ,hostN\n']] Any help is highly appreciated ta dan. I did indeed mean os.popen, no os.open -- http://mail.python.org/mailman/listinfo/python-list
Best way to delimit a list?
Hi - I have a list returned from popen/readlines, and am wondering how to go about iterating over each item which was returned (rather than currently having the whole lot returned). so far: f=os.open(./get_hostnames).readlines returns ['host1 host2 host3 ... hostN\n]' i'd like to be in a position to iterate through these, grabbing each host. I have played with transmuting to a str, and using split, and this works, but I get the subscript brackets from the list output as expected, as the list output is now a string literal, and this is not what I want - and I think it's a bit long-winded to do a search 'n replace on it - hence why I ask in the subject what's the best way. f=str(f) f.split() [['host1,host2, ... ,hostN\n']] Any help is highly appreciated ta dan. -- http://mail.python.org/mailman/listinfo/python-list
Re: Best way to delimit a list?
En Tue, 13 May 2008 07:28:03 -0300, [EMAIL PROTECTED] escribió: Hi - I have a list returned from popen/readlines, and am wondering how to go about iterating over each item which was returned (rather than currently having the whole lot returned). so far: f=os.open(./get_hostnames).readlines returns ['host1 host2 host3 ... hostN\n]' You meant readlines(), I presume. A file acts as its own iterator: f=os.open(./get_hostnames) try: for line in f: # do something with line finally: f.close() -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: Best way to delimit a list?
On May 13, 5:46 am, [EMAIL PROTECTED] wrote: On May 13, 11:28 am, [EMAIL PROTECTED] wrote: Hi - I have a list returned from popen/readlines, and am wondering how to go about iterating over each item which was returned (rather than currently having the whole lot returned). so far: f=os.open(./get_hostnames).readlines returns ['host1 host2 host3 ... hostN\n]' i'd like to be in a position to iterate through these, grabbing each host. I have played with transmuting to a str, and using split, and this works, but I get the subscript brackets from the list output as expected, as the list output is now a string literal, and this is not what I want - and I think it's a bit long-winded to do a search 'n replace on it - hence why I ask in the subject what's the best way. f=str(f) f.split() [['host1,host2, ... ,hostN\n']] Any help is highly appreciated ta dan. I did indeed mean os.popen, no os.open- Hide quoted text - - Show quoted text - I do indeed write a pretty fine real-time, low-bandwidth, game. It is like real-time chess, and seen the movie, Tron. Can't the P2Ps zip up in an hour? -- http://mail.python.org/mailman/listinfo/python-list
Re: Best way to delimit a list?
On May 13, 11:51 am, Gabriel Genellina [EMAIL PROTECTED] wrote: You meant readlines(), I presume. A file acts as its own iterator: f=os.open(./get_hostnames) try: for line in f: # do something with line finally: f.close() -- Gabriel Genellina Hi - thank you for your reply. I meant: f=os.popen(./get_hostnames).readlines() So f is a list, rather than a file object, of which os.open would have returned (my initial typo redirected the missive of this post, sorry!) cheers -- http://mail.python.org/mailman/listinfo/python-list
Re: Best way to delimit a list?
On May 13, 6:18 am, Gabriel Genellina [EMAIL PROTECTED] wrote: En Tue, 13 May 2008 07:46:45 -0300, [EMAIL PROTECTED] escribió: On May 13, 11:28 am, [EMAIL PROTECTED] wrote: Hi - I have a list returned from popen/readlines, and am wondering how to go about iterating over each item which was returned (rather than currently having the whole lot returned). f=os.open(./get_hostnames).readlines I did indeed mean os.popen, no os.open Ouch, replace open with popen an my example is valid (but to get the meaning I intended to write, replace os.open with open...) -- Gabriel Genellina Writing's fine, but don't the musicals suck? -- http://mail.python.org/mailman/listinfo/python-list
Re: Best way to delimit a list?
En Tue, 13 May 2008 07:46:45 -0300, [EMAIL PROTECTED] escribió: On May 13, 11:28 am, [EMAIL PROTECTED] wrote: Hi - I have a list returned from popen/readlines, and am wondering how to go about iterating over each item which was returned (rather than currently having the whole lot returned). f=os.open(./get_hostnames).readlines I did indeed mean os.popen, no os.open Ouch, replace open with popen an my example is valid (but to get the meaning I intended to write, replace os.open with open...) -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: Best way to delimit a list?
On May 13, 6:18 am, Gabriel Genellina [EMAIL PROTECTED] wrote: En Tue, 13 May 2008 07:46:45 -0300, [EMAIL PROTECTED] escribió: On May 13, 11:28 am, [EMAIL PROTECTED] wrote: Hi - I have a list returned from popen/readlines, and am wondering how to go about iterating over each item which was returned (rather than currently having the whole lot returned). f=os.open(./get_hostnames).readlines I did indeed mean os.popen, no os.open Ouch, replace open with popen an my example is valid (but to get the meaning I intended to write, replace os.open with open...) -- Gabriel Genellina Yes: fine! But, all we do is start a Tron ring, play Tron on laptops. You have micro-divide currency, you can probably make musicals -too-; and I don't have enough to say to get this... BE TALKING! -- http://mail.python.org/mailman/listinfo/python-list
Re: Best way to delimit a list?
[EMAIL PROTECTED] schrieb: Hi - I have a list returned from popen/readlines, and am wondering how to go about iterating over each item which was returned (rather than currently having the whole lot returned). so far: f=os.open(./get_hostnames).readlines returns ['host1 host2 host3 ... hostN\n]' i'd like to be in a position to iterate through these, grabbing each host. I have played with transmuting to a str, and using split, and this works, but I get the subscript brackets from the list output as expected, as the list output is now a string literal, and this is not what I want - and I think it's a bit long-winded to do a search 'n replace on it - hence why I ask in the subject what's the best way. f=str(f) f.split() [['host1,host2, ... ,hostN\n']] Any help is highly appreciated untested: f= .join(f) f.split() Best regards Wolfgang -- http://mail.python.org/mailman/listinfo/python-list
Re: Best way to delimit a list?
On Tue, 2008-05-13 at 03:28 -0700, [EMAIL PROTECTED] wrote:
Hi - I have a list returned from popen/readlines, and am wondering how
to go about iterating over each item which was returned (rather than
currently having the whole lot returned).
so far:
f=os.open(./get_hostnames).readlines
returns ['host1 host2 host3 ... hostN\n]'
i'd like to be in a position to iterate through these, grabbing each
host. I have played with transmuting to a str, and using split, and
this works, but I get the subscript brackets from the list output as
expected, as the list output is now a string literal, and this is not
what I want - and I think it's a bit long-winded to do a search 'n
replace on it - hence why I ask in the subject what's the best way.
f=str(f)
f.split()
[['host1,host2, ... ,hostN\n']]
Instead of casting to a string, each element of your list is already a
string, so use that instead:
f = open(get_hostnames)
hosts =[]
# gets each string one at a time.
for line in f:
# get rid of the pesky \n at the end
line = line.strip()
# separate the hostnames into a list
hosts += line.split(' ')
Any help is highly appreciated
ta
dan.
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Re: Best way to delimit a list?
On May 13, 2008, at 12:28 PM, [EMAIL PROTECTED] wrote: Hi - I have a list returned from popen/readlines, and am wondering how to go about iterating over each item which was returned (rather than currently having the whole lot returned). so far: f=os.open(./get_hostnames).readlines returns ['host1 host2 host3 ... hostN\n]' i'd like to be in a position to iterate through these, grabbing each host. I have played with transmuting to a str, and using split, and this works, but I get the subscript brackets from the list output as expected, as the list output is now a string literal, and this is not what I want - and I think it's a bit long-winded to do a search 'n replace on it - hence why I ask in the subject what's the best way. f=str(f) f.split() [['host1,host2, ... ,hostN\n']] If the file is really big, you may want not to construct an actual list with all the words, but instead use an iterator. If you define the function def ichain(seq): for s in seq: for x in s: yield x (which is often useful and I don't think it has been included in itertools) you can iterate lazily on the file: hosts = ichain(s.split() for s in f) for host in hosts: # ... HTH, Giuseppe -- http://mail.python.org/mailman/listinfo/python-list
Re: Best way to delimit a list?
Giuseppe Ottaviano wrote: def ichain(seq): for s in seq: for x in s: yield x (which is often useful and I don't think it has been included in itertools) you can iterate lazily on the file: Python 2.6 includes itertools.chain.from_iterable() with that functionality. Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: Best way to delimit a list?
On May 13, 8:17 am, Giuseppe Ottaviano [EMAIL PROTECTED] wrote: On May 13, 2008, at 12:28 PM, [EMAIL PROTECTED] wrote: Hi - I have a list returned from popen/readlines, and am wondering how to go about iterating over each item which was returned (rather than currently having the whole lot returned). so far: f=os.open(./get_hostnames).readlines returns ['host1 host2 host3 ... hostN\n]' i'd like to be in a position to iterate through these, grabbing each host. I have played with transmuting to a str, and using split, and this works, but I get the subscript brackets from the list output as expected, as the list output is now a string literal, and this is not what I want - and I think it's a bit long-winded to do a search 'n replace on it - hence why I ask in the subject what's the best way. f=str(f) f.split() [['host1,host2, ... ,hostN\n']] If the file is really big, you may want not to construct an actual list with all the words, but instead use an iterator. If you define the function def ichain(seq): for s in seq: for x in s: yield x (which is often useful and I don't think it has been included in itertools) you can iterate lazily on the file: hosts = ichain(s.split() for s in f) for host in hosts: # ... HTH, Giuseppe- Hide quoted text - - Show quoted text - I am having trouble following, but I am not an always-rightter. Was s.split( ) one of the things you wanted to do to a line, and likely a really common one? I'm trying to approach problems impractically. Now of course, if anything else is going on in the program, you will need separate threads or separate interpreters/processes. Does Python meet sufficiencies on threading? What file do we have to test it on? -- http://mail.python.org/mailman/listinfo/python-list
Re: Best way to delimit a list?
On May 13, 8:32 am, Peter Otten [EMAIL PROTECTED] wrote: Giuseppe Ottaviano wrote: def ichain(seq): for s in seq: for x in s: yield x (which is often useful and I don't think it has been included in itertools) you can iterate lazily on the file: Python 2.6 includes itertools.chain.from_iterable() with that functionality. Peter Can you color the help manual with very fine shades of off-white to ease reading? I was thinking a few pixels shy of red of white to accentuate what are the class methods and which are not. I also have an argument that net readability would decrease, but the sample sizes on that kind of metric are a little brinky with privacy fears around where I'm from. I just try to make Tron rings. -- http://mail.python.org/mailman/listinfo/python-list
Re: Best way to delimit a list?
On May 13, 9:08 am, [EMAIL PROTECTED] wrote: On May 13, 8:32 am, Peter Otten [EMAIL PROTECTED] wrote: Giuseppe Ottaviano wrote: def ichain(seq): for s in seq: for x in s: yield x (which is often useful and I don't think it has been included in itertools) you can iterate lazily on the file: Python 2.6 includes itertools.chain.from_iterable() with that functionality. Peter Can you color the help manual with very fine shades of off-white to ease reading? I was thinking a few pixels shy of red of white to accentuate what are the class methods and which are not. I also have an argument that net readability would decrease, but the sample sizes on that kind of metric are a little brinky with privacy fears around where I'm from. I just try to make Tron rings. I am also me the that's the readability of legibles on color of light the lighterers. More simply, that could vary widely though, and I've heard of a 'fovea'. -- http://mail.python.org/mailman/listinfo/python-list
Re: Best way to delimit a list?
On May 13, 9:31 am, [EMAIL PROTECTED] wrote: On May 13, 9:08 am, [EMAIL PROTECTED] wrote: On May 13, 8:32 am, Peter Otten [EMAIL PROTECTED] wrote: Giuseppe Ottaviano wrote: def ichain(seq): for s in seq: for x in s: yield x (which is often useful and I don't think it has been included in itertools) you can iterate lazily on the file: Python 2.6 includes itertools.chain.from_iterable() with that functionality. Peter Can you color the help manual with very fine shades of off-white to ease reading? I was thinking a few pixels shy of red of white to accentuate what are the class methods and which are not. I also have an argument that net readability would decrease, but the sample sizes on that kind of metric are a little brinky with privacy fears around where I'm from. I just try to make Tron rings. I am also me the that's the readability of legibles on color of light the lighterers. More simply, that could vary widely though, and I've heard of a 'fovea'.- Hide quoted text - - Show quoted text - Furthermore Optical Sensors and Sensing Systems for Natural Resources and Food Safety and Quality from wixipedia omits sex. for Food and Sex. I think concepts are related to perceptions. food. -- http://mail.python.org/mailman/listinfo/python-list
