Language Semantics: @ symbol??
Sorry, for the noob question, but I haven't been able to find documentation on this matter. I've been looking for documentation that describes what the @function() syntax is all about. I've seen this on a few pages, for instance: http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/307871 and also in TurboGears: http://www.turbogears.com/docs/wiki20/page5.html The general format appears to be: @somefunction() def a_newfunction(): What does it mean and what does it do? Thanks! -- http://mail.python.org/mailman/listinfo/python-list
Re: Language Semantics: @ symbol??
Awesome! Thanks. -- http://mail.python.org/mailman/listinfo/python-list
In need of a virtual filesystem / archive
I need to store a large number of files in an archive. From Python, I need to be able to create an archive, put files into it, modify files that are already in it, and delete files already in it. The easy solution would be to use a zip file or a tar file. Python has good standard modules for accessing those types. However, I would tend to think that modifying or deleting files in the archive would require rewriting the entire archive. Is there any archive format that can allow Python to modify a file in the archive *in place*? That is to say if my archive is 2GB large and I have a small text file in the archive I want to be able to modify that small text file (or delete it) without having to rewrite the entire archive to disk. Does anything like this exist? If nothing exists for Python, is there something written in C maybe that I could wrap (preferably you won't suggest wrapping the ext2 filesystem driver.. ;) ? -- http://mail.python.org/mailman/listinfo/python-list
Re: In need of a virtual filesystem / archive
Thanks for all the suggestions! I realized a few minutes after I posted that a database would work.. I just wasn't in that "mode" of thinking when I posted. PyTables also looks very interesting, especially because apparently I can read a file in the archive like a normal python file, ie one line at a time. Could I do the same using SQL? I'm assuming I would get the whole file back when I did my SELECT statement. I guess I could chunk the file out and store it in multiple rows, but that sounds complicated. -- http://mail.python.org/mailman/listinfo/python-list
Re: Best way to handle exceptions with try/finally
We used to have a try..except..finally syntax in Python. It was taken out a while ago for reasons unknown to me. The good news is that it is back in Python 2.5. I haven't tested it, but Guido said so himself: http://video.google.com/videoplay?docid=60331183357868340 -- http://mail.python.org/mailman/listinfo/python-list
Re: beautiful soup library question
Here's how I print each line after the 's:
import BeautifulSoup as Soup
page=open("test.html").read()
soup=Soup.BeautifulSoup(page)
for br in soup.fetch('br'):
print br.next
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Re: capturing stdout from lynx..
Does this do what you want?
import os
filename = "test.html"
cmd = os.popen("lynx -dump %s" % filename)
output = cmd.read()
cmd.close()
print output
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Threads: does Thread.start() atomically set Thread.__started ?
Can some kind person please further my education on Threads? When I create a thread called "t" and I do a "t.start()" am I guaranteed that "t.isAlive()" will return True as long as the thread hasn't already completed? Put another way, does "t.start()" ever return before t.__started is set to True? consider this example: import time import threading class MyThread(threading.Thread): def __init__(self): self.completed = False threading.Thread.__init__(self) def run(self): #do something time.sleep(1) self.completed = True t = MyThread() while t.isAlive() == False and t.completed == False: t.start() In the above code, am I guaranteed that t will only be (attempted to be) started once? Thanks, Ryan -- http://mail.python.org/mailman/listinfo/python-list
Re: Threads: does Thread.start() atomically set Thread.__started ?
Peter, Thanks for the reference! I don't know why but for some reason I thought that I would be wading through a bunch of C code (which I know very little of). I haven't found my answer yet but this threading.py does look fairly straightforward. Thanks! -- http://mail.python.org/mailman/listinfo/python-list
Re: Spidering Hacks for Python, not Perl
I've been looking for similar stuff recently. I haven't found much, but this is the list of links I've come across so far: Harvest Man - http://harvestman.freezope.org/ Mechanize - http://wwwsearch.sourceforge.net/mechanize/ Beautiful Soup - http://www.crummy.com/software/BeautifulSoup/ (Neither Beautiful Soup, nor Mechanize are complete crawlers but probably have a lot of the nuts and bolts) If anyone is aware of a book or other documentation like the OP would like, I would be pleased to see it as well. -- http://mail.python.org/mailman/listinfo/python-list
Re: years later DeprecationWarning
> (That long-gone guy is actually me, according to the notes in the program. > However those brain cells are long gone now, so it might as well not be me.) I had a great long laugh with this bit. I guess it's because I can relate so well :) -- http://mail.python.org/mailman/listinfo/python-list
Re: a hobbyist's dilemma
I would second the vote for pythonchallenge. It's what taught me Python. The amazing thing about the python challenge is by the time your done with it, you've gotten through a very large and diverse sampling of the python docs. It really gave me a good understanding of all the things that Python can do. You'll still want to read more traditional tutorials and thoery as well, but that can wait, just play around with it for a while. -- http://mail.python.org/mailman/listinfo/python-list
Matplotlib: Histogram with bars inside grid lines...how??
I'm playing around with matplotlib for the first time. I'm trying to make a very simple histogram of values 1-6 and how many times they occur in a sequence. However, after about an hour of searching I cannot make the histogram stay within the bounds of the grid lines. Here is my example: pylab.grid() x_values=[1,1,2,2,2,3,3,3,4,4,4,5,5,6,6,6] pylab.hist(x_values,6) pylab.show() This produced the following image: http://enigmacurry.com/usenet/historgram-bars-not-in-grid-lines.png Starting with bar number 2, it creeps into grid 1.. and finally with bar number 5 it's almost entirely in grid 4.. how do I make the bars stay in their own grid lines? I can see that hist() is somehow derived from bar() ... so it appears that hist() has some undocumented parameters. I tried specifiying width=1 but that just squished all of the bars together. Also, is there a more object-oriented graphing package for Python? (How am I supposed to know that hist() is derived from bar() if the docs don't show proper inheritance?) Thanks! -- http://mail.python.org/mailman/listinfo/python-list
Re: Matplotlib: Histogram with bars inside grid lines...how??
Two things:
1) I now see where width is defined in the hist() documentation... I
was expecting it to be in the definition up at the top, but instead the
definition has **kwords.. not very helpful.
2) I noticed in my original historgram, that the y scale was not the
same as the x scale.. so I updated my code:
import pylab
pylab.grid()
x_values=[1,1,2,2,2,3,3,3,4,4,4,5,5,6,6,6]
pylab.hist(x_values,6)
pylab.yticks(pylab.arange(3))
pylab.axis('scaled')
pylab.show()
It produced this image:
http://enigmacurry.com/usenet/historgram-bars-not-in-grid-lines2.png
It has the same problem..
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Re: Matplotlib: Histogram with bars inside grid lines...how??
Thank you John. Your explanation helped a lot!
In case it helps anyone else in the future, here is my code for
*exactly* what I was after:
import pylab
def ryan_hist(data, bar_width, min_x, max_x):
"""
Create a frequency histogram over a continuous interval
min_x = the low end of the interval
max_x = the high end of the interval
bar_width = the width of the bars
This will correctly align the bars of the histogram
to the grid lines of the plot
"""
#Make histogram with bars of width .9 and center
#them on the integer values of the x-axis
bins = pylab.nx.arange(1-(bar_width/2),max(data))
n,bins,patches = pylab.hist(data, bins, width=bar_width)
#Make Y axis integers up to highest n
pylab.yticks(pylab.arange(sorted(n)[-1]))
pylab.axis('scaled')
pylab.xlim(0.5,6.5)
pylab.grid()
pylab.show()
#Create a historgram
data=[1,1,2,2,2,2,2,2,3,3,3,4,4,4,5,5,6,6,6]
bar_width = 0.9
ryan_hist(data,bar_width,min(data),max(data))
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Re: Matplotlib: Histogram with bars inside grid lines...how??
pylab.xlim(0.5,6.5) should be: pylab.xlim(min_x-(bar_width/2),max_x+(bar_width/2)) -- http://mail.python.org/mailman/listinfo/python-list
Python based 'Toaster' animation like Gaim or MSN Messenger?
I'm looking for something that can display a pop-up "toaster" like animation like Gaim or MSN messenger does to notify of incoming messages. There's JToaster ( http://jtoaster.sourceforge.net/ ) for Java... anything similar for Python? Thanks! Ryan McGuire -- http://mail.python.org/mailman/listinfo/python-list
Re: Python based 'Toaster' animation like Gaim or MSN Messenger?
Ok, cool! There's one for wxPython called ToasterBox ( http://wiki.wxpython.org/index.cgi/ToasterBox ) I'm more familiar with pyGTK.. so if anyone knows one based on pyGTK, please let me know! :) Ryan McGuire -- http://mail.python.org/mailman/listinfo/python-list
Re: How's python's web scraping capabilities (vs LWP) ...
I don't know much about LWP.. but Beautiful Soup is grand! http://www.crummy.com/software/BeautifulSoup/ Ryan McGuire -- http://mail.python.org/mailman/listinfo/python-list
