Re: file.readlines() - gives me error (bad file descriptor)
I tried
logfile=file(r'test.txt','w+')
logfile.write('datetime')
test=logfile.readlines()
print test
I got :
Open an encoded file using the given mode and return
a wrapped version providing transparent encoding/decoding.
Note: The wrapped version will only accept the object format
defined by the codecs, i.e. Unicode objects for most builtin
codecs. Output is also codec dependent and will usually by
Unicode as well.
Files are always opened in binary mode, even if no binary mode
was specified. This is done to avoid data loss due to encodings
using 8-bit values. The default file mode is 'rb' meaning to
open the file in binary read mode.
encoding specifies the encoding which is to be used for the
file.
errors may be given to define the error handling. It defaults
to 'strict' which causes ValueErrors to be raised in case an
encoding
and a hell lot of junk. Can anyone explain that???
AFAIK w+ was ment for opening a file for both writting and reading...
Regards,
Garry
On Thu, 6 Jan 2005 12:03:27 +0530, Vishnu <[EMAIL PROTECTED]> wrote:
> logfile = file(r'test.txt','w')
> logfile.write('datetime')
> logfile.close() # <- close the file
>
> logfile = file(r'test.txt','r') # <- Open the file in read mode
> test=logfile.readlines()
>
>
> ~Vishnu.
>
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of
> [EMAIL PROTECTED]
> Sent: Thursday, January 06, 2005 11:53 AM
> To: python-list@python.org
> Subject: file.readlines() - gives me error (bad file descriptor)
>
> Hey guys,
>
> I can't figure this one out, why is this simple script giving me
> problems?
>
> logfile=file(r'test.txt','w')
> logfile.write('datetime')
> test=logfile.readlines()
>
> When I run it I get the error message:
> Traceback (most recent call last):
> File "C:\Documents and Settings\Gregory\My Documents\Get New Great
> Job\testfile.py", line 3, in ?
> test=logfile.readlines()
> IOError: [Errno 9] Bad file descriptor
>
> I'm running Windows XP, Python 2.3.3 (#51, Dec 18 2003, 20:22:39) [MSC
> v.1200 32 bit (Intel)] on win32
> Any help would be greatly appricated.
>
> Thanks,
>
> Greg
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
--
Thanks and Regards,
GSS
--
http://mail.python.org/mailman/listinfo/python-list
Re: file.readlines() - gives me error (bad file descriptor)
logfile=file(r'test.txt','a+')
logfile.write('datetime')
logfile.flush()
test=logfile.readlines()
print test
I added logfile.flush(), the 'datetime' was written in the file
correctly but I couldn't get any result...
Crazy!
Garry
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Re: file.readlines() - gives me error (bad file descriptor)
On Thu, 6 Jan 2005 12:55:22 +0530, Binu K S <[EMAIL PROTECTED]> wrote: >>>The file's current position moves as you write into it. I concure and have figured out the solution BUT while reading from the file from the position where the file handler is, should return "Null/Blank/Anything in this world" BUT should not write into the file... The information written was that in the Buffer of the handler... Does that mean reading a file will actually release the buffer by throwing the contents in the file??? Please Comment... >>>You normally wouldn't read from the file that you are writing into. May be applicable in handling logs... Regards, Garry -- http://mail.python.org/mailman/listinfo/python-list
Re: file.readlines() - gives me error (bad file descriptor)
On Thu, 6 Jan 2005 14:27:40 +0530, Binu K S <[EMAIL PROTECTED]> wrote:
> I'm sorry, I didn't get what you trying to say here. Where do you see
> a read altering the file? An example might help.
Please try:
logfile=file(r'test.txt','w+')
logfile.write('datetime')
Check the contents of test.txt, you will get what ever was required...
Now Run:
logfile=file(r'test.txt','w+')
logfile.write('datetime')
logfile.readlines()
and check the contents of test.txt???
My doubt is that logfile.write('datetime') will write datetime that is
universaly accepted but why all that junk is appending to that when I
add logfile.readlines()
Strange or Am I on drugs??? :o)
Please Comment...
Garry
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Upgraded to python2.3 but httpd taking old version
I upgraded my python to 2.3 from 2.2 but Apache (V 2.0.4) is taking old libraries for processing. I also made a soft link redirecting the old files to new files but of no help... These error logs shows that it is still using 2.2 :o( [Tue Jan 11 16:18:45 2005] [error] [client 127.0.0.1] import cgi [Tue Jan 11 16:18:45 2005] [error] [client 127.0.0.1] File "/usr/lib/python2.2/cgi.py", line 38, in ? Please help -- Garry -- http://mail.python.org/mailman/listinfo/python-list
pyPgSQL giving error!
I am using Redhat 9.0/python2.3. I installed pyPgSQL-2.4.tar.gz and it was successfull. Now when I am trying to import that module, I got: Python 2.3.3 (#1, Jan 11 2005, 15:24:09) [GCC 3.2.2 20030222 (Red Hat Linux 3.2.2-5)] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> from pyPgSQL import PgSQL Traceback (most recent call last): File "", line 1, in ? File "pyPgSQL/PgSQL.py", line 391, in ? from libpq import * File "pyPgSQL/libpq/__init__.py", line 23, in ? from libpq import * ImportError: No module named libpq I tried googling also but couldn't get the answere. Please help... ~Garry -- http://mail.python.org/mailman/listinfo/python-list
Re: pyPgSQL giving error!
> did you really do ./configure, make and make install? No, I did python setup.py build and python setup.py install > where is libpq.* linpq is there in /usr/lib/python2.3/site-packages/pyPgSQL/ > was a postgres installation present while doing ./configure et all? No, But I installed postgresql-libs before installing pyPgSQL Regards, Garry -- http://mail.python.org/mailman/listinfo/python-list
Re: pyPgSQL giving error!
And now when I did... cd /usr/local/lib/python2.3/site-packages/pyPgSQL/libpq/ [EMAIL PROTECTED] libpq]# python __init__.py Traceback (most recent call last): File "__init__.py", line 23, in ? from libpq import * ImportError: ./libpqmodule.so: undefined symbol: PyUnicodeUCS2_EncodeDecimal What is this error??? I saw this error sometimes back... Please help... Thanks, Garry -- http://mail.python.org/mailman/listinfo/python-list
Problem in importing MySQLdb
I am using Mysql version 5.0.2-alpha on RedHat 9.0 (python2.2) When I try to import MySQldb I get: Python 2.2.2 (#1, Feb 24 2003, 19:13:11) [GCC 3.2.2 20030222 (Red Hat Linux 3.2.2-4)] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import MySQLdb Traceback (most recent call last): File "", line 1, in ? File "/usr/lib/python2.2/site-packages/MySQLdb/__init__.py", line 27, in ? import _mysql ImportError: /usr/lib/libmysqlclient.so.10: symbol errno, version GLIBC_2.0 not defined in file libc.so.6 with link time reference Is there any problem in library files?? Do I need to install anything I have installed MySQL-shared-3.23.54a-1.i386.rpm, MySQL-devel-5.0.2-0.i386.rpm, MySQL-client-5.0.2-0.i386.rpm, MySQL-server-5.0.2-0.i386.rpm Please help, Garry -- http://mail.python.org/mailman/listinfo/python-list
Two classes problem
I have two classes;
a.py -->
#!/usr/bin/python
global test
test =''
class a(b):
def __init__(self,test):
print test
print 'Outside: '+test
b.py -->
#!/usr/bin/python
import a
a.a('Garry')
I want to pass this string (or any object later) to a.py and that too
outside the scope of class a.
Is that possible??? If yes, how???
Thanks,
Garry
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Re: Two classes problem
The purpose is, I pass a list to a class in a module but I want to use that list out of the scope of that class and that too not in any other class or a function but in the main program... The problem is that when I import that, the statements in the module which are not in the class are executed first and then the variable gets intiallised... I will explain with the example... -global test - -class a: -def __init__(self,test): -global test -print test - -print 'Outside: '+test I want to print that variable test which I am giving to the class as an argument, in the scope of main... I know it is not a good way of programming but my situation is like this... But is this possible or not? If I pass test as 'Garry' can I (by any way) print 'Outside: Garry' with that print statement... (in the main scope) Thanks and Regards, Garry -- http://mail.python.org/mailman/listinfo/python-list
Re: f*cking re module
try:
re.search("()(/python>)", str).group()
except:
print 'not found'
otherwise,
re.search("().*?(\/python>)", str).group()
this is will help!
Regards,
Gurpreet Singh
Blogging [at] http://garrythegambler.blogspot.com
On 4 Jul 2005 01:04:47 -0700, jwaixs <[EMAIL PROTECTED]> wrote:
> arg... I've lost 1.5 hours of my precious time to try letting re work
> correcty. There's really not a single good re tutorial or documentation
> I could found! There are only reference, and if you don't know how a
> module work you won't learn it from a reference!
>
> This is the problem:
>
> >>> import re
> >>> str = "blablaRe modules sucks!blabla"
> >>> re.search("()(/python>)", str).group()
> Traceback (most recent call last):
> File "", line 1, in ?
> AttributeError: 'NoneType' object has no attribute 'group'
>
> the only thing I want are the number of places blabla, Re modules
> sucks! and blabla are.
>
> Noud
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
--
Thanks and Regards,
GSS
--
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Re: Friend wants to learn python
http://www.byteofpython.info/download Wonderful book for newbie! Regards, G Blogs: http://garrythegambler.blogspot.com/ -- http://mail.python.org/mailman/listinfo/python-list
Operator Overloading
Hi, Is there any provision in python which allows me to make my own operators? My problem is that I need to combine two dictonaries with their keys and I don't want to use any of the existing operators like '+','-','*'. So is there a way I can make '**' or '~' as my operators to add two dictonaries? If not which all operators can I overoad? Thanks, Garry http://garrythegambler.blogspot.com -- http://mail.python.org/mailman/listinfo/python-list
Help on Swig
Hi,
I am facing a problem with swig while using Pointers:
#include
void Array(int *ptr)
{
int i;
for (i = 0; i < 6; i++)
{
printf("Index: %d - %d\n",i, *(ptr + i));
}
}
%module Array
%{
extern void Array(int *ptr);
#include
%}
extern void Array(int *ptr);
While running:
>>> import Array
>>> a=[1,3,2,4,5,6,7,9]
>>> Array.Array(a)
Traceback (most recent call last):
File "", line 1, in ?
TypeError: argument number 1: a 'int *' is expected, 'list([1, 3, 2, 4, 5, 6, 7, 9])' is received
Do I need to make some changes in Interface file?
Also I need to return that array after sorting it. How do I return it and collect the same in python.
Thanks and Regards,
Cheers!
«·´`·.(*·.¸(`·.¸ ¸.·´)¸.·*).·´`·»
«.[ Garry ].»
«·´`·.(¸.·*(¸.·´ `·.¸)*·.¸).·´`·»
Blogging at http://garrythegambler.blogspot.com/
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Error in pywordnet
I am using pywordnet and when ever I import the package from wordnet import *, I get an error: "Exception exceptions.AttributeError: "DbfilenameShelf instance has no attribute 'writeback'" in ignored" Now the package works fine until I tried to use that in Apache via CGI. Apache is showing a Server Error and the error_logs states that: [Fri Feb 25 16:06:08 2005] [error] [client 192.168.1.125] from wordnet import *, referer: http://garry/cgi-bin/test.py [Fri Feb 25 16:06:08 2005] [error] [client 192.168.1.125] ImportError: No module named wordnet, referer: http://garry/cgi-bin/test.py While googling, I found: "It is a simple fix that adds the writeback argument to shelve.open calls." Source: http://www-128.ibm.com/developerworks/forums/dw_thread.jsp?forum=185&thread=72747&cat=11 Do anyone have any idea about that? Is there any fix or workaround? Thanks and Regards, Garry http://garrythegambler.blogspot.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Google Technology
>>> : I am just wondering which technologies google is using for gmail and >>> : Google Groups??? Check this: http://tools.devshed.com/c/a/Search%20Engine%20Tricks/To-the-next-level-with-Google-Groups-2 Regards, Garry http://garrythegambler.blogspot.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Regular Expressions: large amount of or's
Can divide the regex on the bases of alphabets they are starting with or can iterate on the list. Regards, Garry http://garrythegambler.blogspot.com/ On Wed, 02 Mar 2005 12:50:01 +0100, André Søreng <[EMAIL PROTECTED]> wrote: > Ola Natvig wrote: > > André Søreng wrote: > > > >> > >> > >> Yes, but I was looking for a solution which would scale. Searching > >> through the same string 1+++ times does not seem like a suitable > >> solution. > >> > >> André > > > > > > Just for curiosity, what would a regexp do? Perhaps it's a clue in how > > you could do this in the way regexp's are executed. > > > > ola > > > > I think this article provides me with what I was looking for: > > http://alexandria.tue.nl/extra1/wskrap/publichtml/200407.pdf > > Enough info there to keep me going for some while. > -- > http://mail.python.org/mailman/listinfo/python-list > -- Thanks and Regards, GSS -- http://mail.python.org/mailman/listinfo/python-list
word to digit module
Is there any module available that converts word like 'one', 'two', 'three' to corresponding digits 1, 2, 3?? Thanks and Regards, GSS -- http://mail.python.org/mailman/listinfo/python-list
Python on Linux Cluster
I have shifted my python script on a 4 node open ssi cluster. Please guide me what changes do I have to do in my python scripts to fully utilize the cluster. How do we introduce parralel processing in python??? -- Thanks and Regards, GSS -- http://mail.python.org/mailman/listinfo/python-list
Problem in threading
I have written a code to figure out the difference in excecution time of a func before and after using threading... [CODE] #!/usr/bin/env python import threading import time loops = [5000,5000] def loop(self, nsec): for i in range(1,nsec): t=i*5000 s=t/10*1 def main(): threads = [] nloops = [0,1] for i in nloops: print '\nSpawning Thread',i,' value: ',loops[i] t = threading.Thread(target=loop,args=(i, loops[i])) threads.append(t) for i in nloops: # start threads threads[i].start() for i in nloops: # wait for all threads[i].join if __name__ == '__main__': start = time.clock() loop(1,5000) print 'Time Taken: ', time.clock()-start start = time.clock() main() print 'Time Taken: ', time.clock()-start [/CODE] Some times this code executes and some times it hangs to death :o( Am I am doing something wrong?? Also the difference of time is not much... How do we best optimize our task by using threads... please help... Thanks and Regards, Gurpreet Singh -- http://mail.python.org/mailman/listinfo/python-list
Re: Problem in threading
>threads[i].join() Oh thanks I corrected that but still the time taken after using thread is more without using them Please Advice... Thanks, Gurpreet Singh -- http://mail.python.org/mailman/listinfo/python-list
Re: Problem in threading
I wrote: >>> Also the difference of time is not much... >>> How do we best optimize our task by using threads... please help... Duncan Booth Wrote: >The only times when it may result in a decrease >in the running time... are when the time the task...when > multiple CPU's are involved. I fotgot to mention that I am running that script on a 4 node Open SSI cluster with 8 processors to do the job... > Unfortunately the latter case isn't handled well by Python Very Strange! > A good use of threads is to improve responsiveness of a system. For example > if you ensure that GUI processing happens on a separate thread from some > CPU intensive computation then you can ensure that the GUI remains > responsive while the computation is running. It won't make the computation > complete any faster (in fact it will probably be slower), but the user will > remain happier. Similarly network applications are usually multi-threaded > so that all requests get a fair chance to complete instead of having to > wait for the slowest to complete before others can run. So That means blindly using threads on any process won't help! >probably have to look at multiple processes rather than > multiple threads. How do I do that??? Does that mean forking the processes or does that mean to change the entire architecture to do small tasks in different processes??? >Alternatively you could move parts of the processing out > of the Python environment by rewriting inner loops in C Any reference/documentation for that??? Thanks and Regards Gurpreet -- http://mail.python.org/mailman/listinfo/python-list
Re: Problem in threading
>>> So That means blindly using threads on any process won't help! > It depends on what "help" means to you. Help means to improve processing speed in achieving a particular task... *Help* here also means that I have a processor farm, how do I best use them to get maximum processing speed out of them... > The example you listed isn't a good use of thread for performance The example was a dummy one to become friendly with Threads and to understand the working/power of them... The example which will be finally used with threads take 5 Days to complete... I want to convert that in few hours! Long Journey ahead... Thanks, Garry -- http://mail.python.org/mailman/listinfo/python-list
Module for handling Nested Tables in HTML
Hi guys, Can anyone suggest some good tool for handling nested tables in a HTML page... BeautifulSoup is somehow not working with Nested Tables. Thanks and Regards, Garry -- http://mail.python.org/mailman/listinfo/python-list
Re: Getting into Python, comming from Perl.
I also coded for more than 3 years and eventually I got that I was not coding but writting poems in perl... Even after 3 months, I go back and check my hand written code, I had to think twice about the logic used... Now its pretty much systematic which incode dcoumentation and programming structure. Rest both are blessed by open source... Regards, Garry On 4/24/05, Miguel Manso <[EMAIL PROTECTED]> wrote: > Hi, list. > > I'm into a psicological doubt that I would like to share with you > (you'll know why later on this mail). > > I'm a programmer with 5 year of experience into Perl. I'm on that point > where you resolve problems without thinking on HOW you'll do it with > that language but only on the problem itself. > > Since Perl 6 started I've been following it. The conclusion I have is > they're making a whole new language and I'll have to learn it. This > being said and, since I've to learn a new language, I've started > thinking in a new language. I've noticed Python is getting more and more > developers and many projects are being made. > > I've tryed to use python some times but I get frustrated very quick. I > get myself many times needing to figure out how to loop through a list, > declare an associative array, checking how to pass named parameters to > functions, and simple things like that. > > What I would like to know is if anyone had these problems and if you can > share that experience with me. I'm trying to minimize my "frustration" :) > > Thanks a lot. > > -- > Miguel Manso <[EMAIL PROTECTED]> > > Amplitude Net > Net - Rua dos Salazares, 842 > 4100-442 Porto > > Phone: +351 22 532 2000 > Fax: +351 22 618 2157 > Web: www.amplitudenet.pt > > > -- > http://mail.python.org/mailman/listinfo/python-list > -- Thanks and Regards, GSS -- http://mail.python.org/mailman/listinfo/python-list
