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• Python: unable to inherit from a C extension.

  - by celil

  I am trying to add a few extra methods to a matrix type from the pysparse library. Apart from that I want the new class to behave exactly like the original, so I chose to implement the changes using inheritance. However, when I try from pysparse import spmatrix class ll_mat(spmatrix.ll_mat): pass this results in the following error TypeError: Error when calling the metaclass bases cannot create 'builtin_function_or_method' instances What is this causing this error? Is there a way to use delegation so that my new class behaves exactly the same way as the original?

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• can someone please show me how to convert this pseudocode to python using nested loops

  - by angel

  N=5 For(rate=0.05, rate <= 0.15, rate = rate +0.05) For(principle=1000, principle <= 1500, principle=principle + 1000) simple = principle * (1 + rate * N) #Where N is the number of years compound = principle * (1 + rate) ^ N print simple + " " + compound End For End For

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• python search replace using wildcards

  - by tom smith

  hi somewhat confused.. but trying to do a search/repace using wildcards if i have something like: <blah.... ssf ff> <bl.... ssf dfggg ff> <b.... ssf ghhjj fhf> and i want to replace all of the above strings with say, <hh >t any thoughts/comments on how this can be accomplished? thanks update (thanks for the comments!) i'm missing something... my initial sample text are: Soo Choi</span>LONGEDITBOX">Apryl Berney Soo Choi</span>LONGEDITBOX">Joel Franks Joel Franks</span>GEDITBOX">Alexander Yamato and i'm trying to get Soo Choi foo Apryl Berney Soo Choi foo Joel Franks Joel Franks foo Alexander Yamato i've tried derivations of name=re.sub("</s[^>]*\">"," foo ",name) but i'm missing something... thoughts... thanks

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• Converting string to datetime object in python

  - by Gussi

  Given this string: "Fri, 09 Apr 2010 14:10:50 +0000" how does one convert it to a datetime object? After doing some reading I feel like this should work, but it doesn't... >>> from datetime import datetime >>> >>> str = 'Fri, 09 Apr 2010 14:10:50 +0000' >>> fmt = '%a, %d %b %Y %H:%M:%S %z' >>> datetime.strptime(str, fmt) Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/usr/lib64/python2.6/_strptime.py", line 317, in _strptime (bad_directive, format)) ValueError: 'z' is a bad directive in format '%a, %d %b %Y %H:%M:%S %z' It should be noted that this works without a problem >>> from datetime import datetime >>> >>> str = 'Fri, 09 Apr 2010 14:10:50' >>> fmt = '%a, %d %b %Y %H:%M:%S' >>> datetime.strptime(str, fmt) datetime.datetime(2010, 4, 9, 14, 10, 50) But I'm stuck with "Fri, 09 Apr 2010 14:10:50 +0000", I would prefer to convert exactly that without changing (or slicing) that string in any way.

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• Python Least-Squares Natural Splines

  - by Eldila

  I am trying to find a numerical package which will fit a natural which minimizes weighted least squares. There is a package in scipy which does what I want for unnatural splines. import numpy as np import matplotlib.pyplot as plt from scipy import interpolate import random x = np.arange(0,5,1.0/2) xs = np.arange(0,5,1.0/500) y = np.sin(x+1) for i in range(len(y)): y[i] += .2*random.random() - .1 knots = np.array([1,2,3,4]) tck = interpolate.splrep(x,y,s=1,k=3,t=knots,task=-1) ynew = interpolate.splev(xs,tck,der=0) plt.figure() plt.plot(xs,ynew,x,y,'x')

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• Using Tkinter in python to edit the title bar

  - by Dan

  I am trying to add a custom title to a window but I am having troubles with it. I know my code isn't right but when I run it, it creates 2 windows instead, one with just the title tk and another bigger window with "Simple Prog". How do I make it so that the tk window has the title "Simple Prog" instead of having a new additional window. I dont think I'm suppose to have the Tk() part because when i have that in my complete code, there's an error from tkinter import Tk, Button, Frame, Entry, END class ABC(Frame): def __init__(self,parent=None): Frame.__init__(self,parent) self.parent = parent self.pack() ABC.make_widgets(self) def make_widgets(self): self.root = Tk() self.root.title("Simple Prog")

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• Text-based game graphics in Python

  - by Jasper

  Hi, i'm pretty new 2 programming, and I'm creating a simple text-based game I'm wondering if there is a simple way to create my own terminal-type window with which I can place coloured input etc. Is there a graphics module well suited to this? I'm using Mac, but I would like it to work on Windows as well Thanks

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• how to send file via http with python

  - by ep45

  Hello, I have a problem. I use Apache with mod_wsgi and webpy, and when i send a file on http, a lot packets are lost. This is my code : web.header('Content-Type','video/x-flv') web.header('Content-length',sizeFile) f = file(FILE_PATH, 'rb') while True: buffer = f.read(4*1024) if buffer : yield buffer else : break f.close() What in my code is wrong ? thanks.

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• In python, changing MySQL query based on function variables

  - by ensnare

  I'd like to be able to add a restriction to the query if user_id != None ... for example: "AND user_id = 5" but I am not sure how to add this into the below function? Thank you. def get(id, user_id=None): query = """SELECT * FROM USERS WHERE text LIKE %s AND id = %s """ values = (search_text, id) results = DB.get(query, values) This way I can call: get(5) get(5,103524234) (contains user_id restriction)

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• Python port forwarding/multiplexing server

  - by Ib33X

  I would like to make server that listen on UDP port 162 (SNMP trap) and then forwards this traffic to multiple clients. Also important is that the source port & address stays same (address spoofing). I guess that best tool for this would be Twisted or Scapy or mybe vanilla sockets, only I can't find anything in the documentation for Twisted about source address spoofing/forging. What would you recommend me to do? Edit:added bounty

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• Using Python and Mechanize with ASP Forms

  - by tchaymore

  I'm trying to submit a form on an .asp page but Mechanize does not recognize the name of the control. The form code is: <form id="form1" name="frmSearchQuick" method="post"> .... <input type="button" name="btSearchTop" value="SEARCH" class="buttonctl" onClick="uf_Browse('dledir_search_quick.asp');" > My code is as follows: br = mechanize.Browser() br.open(BASE_URL) br.select_form(name='frmSearchQuick') resp = br.click(name='btSearchTop') I've also tried the last line as: resp = br.submit(name='btSearchTop') The error I get is: raise ControlNotFoundError("no control matching "+description) ControlNotFoundError: no control matching name 'btSearchTop', kind 'clickable' If I print br I get this: IgnoreControl(btSearchTop=) But I don't see that anywhere in the HTML. Any advice on how to submit this form?

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• remove a sublist from a list in python

  - by ariel

  Hi I am looking for a way to remove a sublist from a list. something like this: a=range(1,10) a.remove([2,3,7]) print a a=[1,4,5,6,8,9]

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• Python SQLite: database is locked

  - by user322683

  I'm trying this code: import sqlite connection = sqlite.connect('cache.db') cur = connection.cursor() cur.execute('''create table item (id integer primary key, itemno text unique, scancode text, descr text, price real)''') connection.commit() cur.close() I'm catching this exception: Traceback (most recent call last): File "cache_storage.py", line 7, in <module> scancode text, descr text, price real)''') File "/usr/lib/python2.6/dist-packages/sqlite/main.py", line 237, in execute self.con._begin() File "/usr/lib/python2.6/dist-packages/sqlite/main.py", line 503, in _begin self.db.execute("BEGIN") _sqlite.OperationalError: database is locked Permissions for cache.db are ok. Any ideas?

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• Javascript or Python? beginner getting up to speed

  - by user62617

  Which language will allow a beginner to get up to speed quicker? Basically which language of the two is easier to learn

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• Encoding in python with lxml - complex solution

  - by Vojtech R.

  Hi, I need to download and parse webpage with lxml and build UTF-8 xml output. I thing schema in pseudocode is more illustrative: from lxml import etree webfile = urllib2.urlopen(url) root = etree.parse(webfile.read(), parser=etree.HTMLParser(recover=True)) txt = my_process_text(etree.tostring(root.xpath('/html/body'), encoding=utf8)) output = etree.Element("out") output.text = txt outputfile.write(etree.tostring(output, encoding=utf8)) So webfile can be in any encoding (lxml should handle this). Outputfile have to be in utf-8. I'm not sure where to use encoding/coding. Is this schema ok? (I cant find good tutorial about lxml and encoding, but I can find many problems with this...) I need robust approved solution so I ask you seniors. Many thanks

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• [Python] How to use re match objects in a list comprehension

  - by Brent.Longborough

  I have a function to pick out lumps from a list of strings and return them as another list: def filterPick(lines,regex): result = [] for l in lines: match = re.search(regex,l) if match: result += [match.group(1)] return result Is there a way to reformulate this as a list comprehension? Obviously it's fairly clear as is; just curious.

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• Operations on Python hashes

  - by cdecker

  I've got a rather strange problem. For a Distributed Hash Table I need to be able to do some simple math operations on MD5 hashes. These include a sum (numeric sum represented by the hash) and a modulo operation. Now I'm wondering what the best way to implement these operations is. I'm using hashlib to calculate the hashes, but since the hashes I get are then string, how do I calculate with them?

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• draw circle PIL - python

  - by ariel

  Hi I am looking for a command that will draw a circle on an existing image. im=Image.open(path) looking for a function that will draw a coloured circle with radious r and center(x,y) thanks for any help provided Ariel

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• Sending and receiving async over multiprocessing.Pipe() in Python

  - by dcolish

  I'm having some issues getting the Pipe.send to work in this code. What I would ultimately like to do is send and receive messages to and from the foreign process while its running in a fork. This is eventually going to be integrated into a pexpect loop for talking to interpreter processes. ` from multiprocessing import Process, Pipe def f(conn): cmd = '' if conn.poll(): cmd = conn.recv() i = 1 i += 1 conn.send([42 + i, cmd, 'hello']) if __name__ == '__main__': parent_conn, child_conn = Pipe() p = Process(target=f, args=(child_conn,)) p.start() from pdb import set_trace; set_trace() while parent_conn.poll(): print parent_conn.recv() # prints "[42, None, 'hello']" parent_conn.send('OHHAI') p.join() `

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• use python glob to find a folder that is a 14 digit number

  - by mikec

  I have a folder with subfolders that are all in the pattern YYYYMMDDHHMMSS (timestamp). I want to use glob to only select the folders that match that pattern.

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• List to CSV in Python

  - by Steve

  Hi, I am creating a CSV from a list of values. CSV File gets created but the csv is formed as a single column. Actually it should be multiple rows with multiple columns, instead it forms as a multiple rows with a single column. I am using the following code from random import choice import csv fileObject = csv.writer(open('Insurance.csv','w'),dialect='excel',delimiter=' ') for i in range(0,175): current_list = list(choice(master_list)) fileObject.writerows(current_list) current_list = [] Thanks

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• Python 2.5.2: trying to open files recursively

  - by user248959

  Hi, the script below should open all the files inside the folder 'pruebaba' recursively but i get this error: Traceback (most recent call last): File "/home/tirengarfio/Desktop/prueba.py", line 8, in f = open(file,'r') IOError: [Errno 21] Is a directory This is the hierarchy: pruebaba folder1 folder11 test1.php folder12 test1.php test2.php folder2 test1.php The script: import re,fileinput,os path="/home/tirengarfio/Desktop/pruebaba" os.chdir(path) for file in os.listdir("."): f = open(file,'r') data = f.read() data = re.sub(r'(\s*function\s+.*\s*{\s*)', r'\1echo "The function starts here."', data) f.close() f = open(file, 'w') f.write(data) f.close() Any idea? Regards Javi

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• Best way to strip punctuation from a string in Python

  - by Lawrence Johnston

  It seems like there should be a simpler way than: import string s = "string. With. Punctuation?" # Sample string out = s.translate(string.maketrans("",""), string.punctuation) Is there?

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• Javascript of Python? beginner getting up to speed

  - by user62617

  which language will allow a beginner to get to speed quicker? Basically what language of two is easier to learn

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• mouse rollover event in Python (VPython)

  - by kame

  Is there something similar to scene.mouse.getclick in the visual module (VPython)? I need it for a rollover. Thanks in advance. EDIT: I need a function for doing something when the mouse moves inside a special area without clicking.

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