Re: [Tutor] Compiling Python 2.6.1 on Leopard
On Sat, Dec 20, 2008 at 3:40 PM, R. Ellsworth Pollard rellsworthpoll...@gmail.com wrote: Where might I find instructions for compiling Python on Leopard? If your goal is just to install Python, there is now a Mac installer available. http://www.python.org/download/releases/2.6.1/ If you really want to build, download the source and see the Mac/README file. A basic framework build is ./configure --enable-framework make sudo make install If you want it to work with Tkinter, there is a problem in the released setup.py, see this bug for a fix: http://bugs.python.org/issue4017 in particular http://bugs.python.org/msg74544 Kent ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Equivalent of grep in python
The following works : file1 = open (file0, r) re.findall ( 'some_text', file1.readline() ) But this doesn't : re.findall ( 'some_text', file1.readlines() ) How do I use grep for a whole text file, not just a single string ? -- View this message in context: http://www.nabble.com/Equivalent-of-grep-in-python-tp2356p2356.html Sent from the Python - tutor mailing list archive at Nabble.com. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Equivalent of grep in python
i believe that the following should work
file1 = open(fileO, 'r')
re.findall ('some_text', file1.read())
readlines returns a list with lists inside, where every list is a line of
the text. The read function returns the entire file as one string, so it
should work to what you are wanting to do.
best regards
Katcipis
On Sun, Dec 21, 2008 at 12:02 AM, ppaarrkk simon_...@yahoo.co.uk wrote:
The following works :
file1 = open (file0, r)
re.findall ( 'some_text', file1.readline() )
But this doesn't :
re.findall ( 'some_text', file1.readlines() )
How do I use grep for a whole text file, not just a single string ?
--
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Re: [Tutor] Equivalent of grep in python
i forgot, this might help you
http://docs.python.org/tutorial/inputoutput.html#reading-and-writing-files
On Sun, Dec 21, 2008 at 11:57 AM, Tiago Katcipis katci...@inf.ufsc.brwrote:
i believe that the following should work
file1 = open(fileO, 'r')
re.findall ('some_text', file1.read())
readlines returns a list with lists inside, where every list is a line of
the text. The read function returns the entire file as one string, so it
should work to what you are wanting to do.
best regards
Katcipis
On Sun, Dec 21, 2008 at 12:02 AM, ppaarrkk simon_...@yahoo.co.uk wrote:
The following works :
file1 = open (file0, r)
re.findall ( 'some_text', file1.readline() )
But this doesn't :
re.findall ( 'some_text', file1.readlines() )
How do I use grep for a whole text file, not just a single string ?
--
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http://www.nabble.com/Equivalent-of-grep-in-python-tp2356p2356.html
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Re: [Tutor] Equivalent of grep in python
Sorry its true, i made a mistake. Readlines is a list with all the lines
inside. I never used readlines (i usually use read), i just read about it on
the tutorial long time ago.
f.readlines()
['This is the first line of the file.\n', 'Second line of the file\n'
Thanks for the help.
On Sun, Dec 21, 2008 at 4:44 PM, Luke Paireepinart
rabidpoob...@gmail.comwrote:
I believe readlines returns a list of strings, not a list of lists.
You can iterate over the characters in a string if you want, though.
On 12/21/08, Tiago Katcipis katci...@inf.ufsc.br wrote:
i forgot, this might help you
http://docs.python.org/tutorial/inputoutput.html#reading-and-writing-files
On Sun, Dec 21, 2008 at 11:57 AM, Tiago Katcipis katci...@inf.ufsc.br
wrote:
i believe that the following should work
file1 = open(fileO, 'r')
re.findall ('some_text', file1.read())
readlines returns a list with lists inside, where every list is a line
of
the text. The read function returns the entire file as one string, so it
should work to what you are wanting to do.
best regards
Katcipis
On Sun, Dec 21, 2008 at 12:02 AM, ppaarrkk simon_...@yahoo.co.uk
wrote:
The following works :
file1 = open (file0, r)
re.findall ( 'some_text', file1.readline() )
But this doesn't :
re.findall ( 'some_text', file1.readlines() )
How do I use grep for a whole text file, not just a single string ?
--
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http://www.nabble.com/Equivalent-of-grep-in-python-tp2356p2356.html
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it might be a profitable thing to learn Java, but it has no
intellectual
value whatsoever Alexander Stepanov
--
it might be a profitable thing to learn Java, but it has no intellectual
value whatsoever Alexander Stepanov
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Re: [Tutor] Equivalent of grep in python
- Forwarded message from Tiago Katcipis katci...@inf.ufsc.br -
i forgot, this might help you
http://docs.python.org/tutorial/inputoutput.html#reading-and-writing-files
I can't help wondering how to do this in python:
perl -wnl -e '/string/ and print;' filename(s)
Not that I want to forget the precious few bits of Perl I do know, but I'd
rather be totally reliant on python for such tasks.
On Sun, Dec 21, 2008 at 11:57 AM, Tiago Katcipis katci...@inf.ufsc.brwrote:
i believe that the following should work
file1 = open(fileO, 'r')
re.findall ('some_text', file1.read())
readlines returns a list with lists inside, where every list is a line of
the text. The read function returns the entire file as one string, so it
should work to what you are wanting to do.
best regards
Katcipis
On Sun, Dec 21, 2008 at 12:02 AM, ppaarrkk simon_...@yahoo.co.uk wrote:
The following works :
file1 = open (file0, r)
re.findall ( 'some_text', file1.readline() )
But this doesn't :
re.findall ( 'some_text', file1.readlines() )
How do I use grep for a whole text file, not just a single string ?
--
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http://www.nabble.com/Equivalent-of-grep-in-python-tp2356p2356.html
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it might be a profitable thing to learn Java, but it has no intellectual
value whatsoever Alexander Stepanov
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value whatsoever Alexander Stepanov
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- End forwarded message -
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Re: [Tutor] Equivalent of grep in python
file1.read() works.
What do I do if I want line numbers ?
I found this code :
http://snippets.dzone.com/posts/show/1638
src = open('2.htm').read()
pattern = 'P([^]+)SUP' # or anything else
for m in re.finditer(pattern, src):
start = m.start()
lineno = src.count('\n', 0, start) + 1
offset = start - src.rfind('\n', 0, start)
word = m.group(1)
print 2.htm(%s,%s): %s % (lineno, offset, word)
Is there not a simpler way than this ?
ppaarrkk wrote:
The following works :
file1 = open (file0, r)
re.findall ( 'some_text', file1.readline() )
But this doesn't :
re.findall ( 'some_text', file1.readlines() )
How do I use grep for a whole text file, not just a single string ?
--
View this message in context:
http://www.nabble.com/Equivalent-of-grep-in-python-tp2356p21118578.html
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[Tutor] subprocess adds %0A to end of string
Hi everyone. Just learning :) I have one program to parse a podcast feed and put it into a file. #!/usr/bin/python Get feed date and link details import feedparser import sys def getFeed(): url = raw_input(Please enter the feed: ) data = feedparser.parse(url) for entry in data.entries: sys.stdout = open(podcast.txt, a) print '%s: %s' % (entry.updated, entry.link) sys.stdout.close() for entry in data.entries: sys.stdout = open(podcast_links.txt, a) print '%s' % (entry.link) sys.stdout.close() getFeed() next to get the latest item; #!/usr/bin/python read the last entry and download podcast import subprocess fname = podcast.txt f = open(fname, 'r') print The Latest Podcast, f.readline() print f.readline() f.close() lname = podcast_links.txt L = open(lname, 'r') print The Latest Link\n download = L.readline() print download answer = raw_input(Do you want to download the podcast? ) if answer == y: wget = wget subprocess.call([wget, download]) else: print oops and here is the output; david [06:37 PM] opteron ~ $ ./py_read_podcast.py The Latest Podcast Sat, 20 Dec 2008 01:52:00 GMT: http://linuxcrazy.com/podcasts/LC-44-arne.mp3 The Latest Link http://linuxcrazy.com/podcasts/LC-44-arne.mp3 Do you want to download the podcast? y --2008-12-21 18:38:46-- http://linuxcrazy.com/podcasts/LC-44-arne.mp3%0A Resolving linuxcrazy.com... 74.220.207.171 Connecting to linuxcrazy.com|74.220.207.171|:80... connected. HTTP request sent, awaiting response... 404 Not Found 2008-12-21 18:38:46 ERROR 404: Not Found. See how it adds the %0A to the end ? I am just trying to get it to work, I know it needs a lot of work, error checking etc. And I am sure there are better ways, I am new. thanks -david -- Powered by Gentoo GNU/LINUX http://www.linuxcrazy.com pgp.mit.edu ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Equivalent of grep in python
Matt Herzog m...@blisses.org wrote
I can't help wondering how to do this in python:
perl -wnl -e '/string/ and print;' filename(s)
The first thing to say is that python is not Perl so there will
be things Perl does more easily than Python and vice versa.
(For example Pythons intersactive mode is miles better
than perls read from stdin mode) Perl is better than python
for quick n dirty one liners, no question. And for every Perl
one liner there will be a relatively short script that can be
written. But you will probably be as well using Perl for
those - its not a bad thing to know and use more than
one language, quite the opposite.
Not that I want to forget the precious few bits of Perl I do know,
but I'd rather be totally reliant on python for such tasks.
Why? I'd hate to be totally reliant on any one language for anything
Whether it be Python, Lisp, C or assembler!
To answer your question I think the answer to your one liner
would look something like:
import fileinput # for iterating over several files
for line in fileinput.input(inplace=1): # files = argv[1:]
try:
line.replace('string', 'edit')
print line
except IOError:
continue# ignore bad filenames
This also should help the OP answer his question about how to
generate filenames, line numbers etc - use fileinput and the
filename(), filelineno() etc functions...
Not as short as Perl but more maintainable.
If you really must do a one liner its probably possible although
it will be longer in Python, but I'm not even going to attempt
it - thats what awk/perl are there for!
HTH,
--
Alan Gauld
Author of the Learn to Program web site
http://www.freenetpages.co.uk/hp/alan.gauld
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Re: [Tutor] subprocess adds %0A to end of string
This seems to work; download = L.readline() print download download = download[0:-1] What is that last character that is added; .mp3%0A -- Powered by Gentoo GNU/LINUX http://www.linuxcrazy.com pgp.mit.edu ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] subprocess adds %0A to end of string
On Sun, Dec 21, 2008 at 7:29 PM, David da...@abbottdavid.com wrote: This seems to work; download = L.readline() print download download = download[0:-1] What is that last character that is added; .mp3%0A It is a newline character (line feed). readline() includes the line endings in the returned lines. Try download = L.readline().rstrip() Kent ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] subprocess adds %0A to end of string
Hi David,
David wrote:
Hi everyone.
Just learning :) I have one program to parse a podcast feed and put it
into a file.
Welcome!
snip
def getFeed():
url = raw_input(Please enter the feed: )
data = feedparser.parse(url)
for entry in data.entries:
sys.stdout = open(podcast.txt, a)
You should probably try to avoid reassigning sys.stdout. This is usually
a bad idea, and can cause odd behavior that is difficult to
troubleshoot, especially for a beginner. A reasonable approach is to
assign the open file object to a name of your own choosing...
. podcast_file = open('podcast.txt', 'a')
... and then, use the write method of the file object ...
. podcast_file.write('%s: %s' % (entry.updated, entry.link))
More info here:
http://www.python.org/doc/2.5.3/tut/node9.html#SECTION00920
print '%s: %s' % (entry.updated, entry.link)
sys.stdout.close()
for entry in data.entries:
sys.stdout = open(podcast_links.txt, a)
print '%s' % (entry.link)
sys.stdout.close()
getFeed()
next to get the latest item;
snip
lname = podcast_links.txt
L = open(lname, 'r')
print The Latest Link\n
download = L.readline()
The readline method returns a line from the file *including* the newline
character(s) ('\n').
print download
answer = raw_input(Do you want to download the podcast? )
if answer == y:
wget = wget
subprocess.call([wget, download])
else:
print oops
OK. There's the problem. Let's assume that after 'download =
L.readline()' that download equals this (you can confirm by adding a
'print repr(download)'):
'http://linuxcrazy.com/podcasts/LC-44-arne.mp3\n'
... then the call becomes (behind the scenes)
subprocess.call(['wget',
'http://linuxcrazy.com/podcasts/LC-44-arne.mp3\n'])
... so the newline is passed as part of the first argument to the wget
command.
Not so coincidentally, the '%0A' represents a newline ('\n') in a
properly quoted/escaped URL.
. import urllib2
. urllib2.unquote('%0A')
'\n'
I suspect it is the wget command which is quoting the newline, not the
subprocess call, as subprocess doesn't know anything about valid
characters for urls.
You can work around this problem as you already have by dropping the
last character as in 'download[:-1]', or use the strip (or rstrip) str
method:
. download.rstrip()
'http://linuxcrazy.com/podcasts/LC-44-arne.mp3'
More info here: http://www.python.org/doc/2.5.3/lib/string-methods.html
HTH,
Marty
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Re: [Tutor] subprocess adds %0A to end of string
Martin Walsh wrote:
Welcome!
thanks
You should probably try to avoid reassigning sys.stdout. This is usually
a bad idea, and can cause odd behavior that is difficult to
troubleshoot, especially for a beginner. A reasonable approach is to
assign the open file object to a name of your own choosing...
. podcast_file = open('podcast.txt', 'a')
... and then, use the write method of the file object ...
. podcast_file.write('%s: %s' % (entry.updated, entry.link))
More info here:
http://www.python.org/doc/2.5.3/tut/node9.html#SECTION00920
print '%s: %s' % (entry.updated, entry.link)
sys.stdout.close()
for entry in data.entries:
sys.stdout = open(podcast_links.txt, a)
print '%s' % (entry.link)
sys.stdout.close()
getFeed()
This podcast_file.write('%s: %s' % (entry.updated, entry.link))
writes it in one very long string
The Latest Link
http://linuxcrazy.com/podcasts/LC-44-arne.ogghttp://linuxcrazy.com/podcas=
and sys.stdout prints to the file one line at a time
How do I split the long string, not even sure if that is the correct term?
for i in somefile: ?
re.somefile(do_something) ?
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Re: [Tutor] subprocess adds %0A to end of string
David wrote:
Martin Walsh wrote:
Welcome!
thanks
welcome (uh oh, infinite loop warning)
This podcast_file.write('%s: %s' % (entry.updated, entry.link))
writes it in one very long string
Copy and paste gets me every time. Try this, and note the presence of
the newline ('\n'):
podcast_file.write('%s: %s\n' % (entry.updated, entry.link))
The Latest Link
http://linuxcrazy.com/podcasts/LC-44-arne.ogghttp://linuxcrazy.com/podcas=
and sys.stdout prints to the file one line at a time
The primary issue is not that you're writing to sys.stdout, it's that
you're using the print statement which implicitly adds a newline.
Technically you can also do the following (python = 2.5, and maybe 2.6)
which should demonstrate the concept...
podcastfile = file(somepath, 'a')
print podcastfile, '%s: %s' (entry.updated, entry.link)
... however, I would recommend against using the above print statement
syntax for anything other than experimentation because 1) it's not
common practice IMHO, and 2) it's gone starting with python 3.0. 'print'
will be a builtin function instead of a statement going forward.
I second Alan's recommendation to read a tutorial or two to solidify
your understanding of the basic concepts. Alan's tutorial is very good,
and covers everything we have discussed so far, particularly the
Handling Files section. Check the link in his email sig.
HTH,
Marty
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