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• How do I set a matplotlib colorbar extents?

  - by Adam Fraser

  I'd like to display a colorbar representing an image's raw values along side a matplotlib imshow subplot which displays that image, normalized. I've been able to draw the image and a colorbar successfully like this, but the colorbar min and max values represent the normalized (0,1) image instead of the raw (0,99) image. f = plt.figure() # create toy image im = np.ones((100,100)) for x in range(100): im[x] = x # create imshow subplot ax = f.add_subplot(111) result = ax.imshow(im / im.max()) # Create the colorbar axc, kw = matplotlib.colorbar.make_axes(ax) cb = matplotlib.colorbar.Colorbar(axc, result) # Set the colorbar result.colorbar = cb If someone has a better mastery of the colorbar API, I'd love to hear from you. Thanks! Adam

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• how to handle an asymptote/discontinuity with Matplotlib

  - by Geddes

  Hello all. Firstly - thanks again for all your help. Sorry not to have accepted the responses to my previous questions as I did not know how the system worked (thanks to Mark for pointing that out!). I have since been back and gratefully acknowledged the kind help I have received. My question: when plotting a graph with a discontinuity/asymptote/singularity/whatever, is there any automatic way to prevent Matplotlib from 'joining the dots' across the 'break'? (please see code/image below). I read that Sage has a [detect_poles] facility that looked good, but I really want it to work with Matplotlib. Thanks and best wishes, Geddes import matplotlib.pyplot as plt import numpy as np from sympy import sympify, lambdify from sympy.abc import x fig = plt.figure(1) ax = fig.add_subplot(111) # set up axis ax.spines['left'].set_position('zero') ax.spines['right'].set_color('none') ax.spines['bottom'].set_position('zero') ax.spines['top'].set_color('none') ax.xaxis.set_ticks_position('bottom') ax.yaxis.set_ticks_position('left') # setup x and y ranges and precision xx = np.arange(-0.5,5.5,0.01) # draw my curve myfunction=sympify(1/(x-2)) mylambdifiedfunction=lambdify(x,myfunction,'numpy') ax.plot(xx, mylambdifiedfunction(xx),zorder=100,linewidth=3,color='red') #set bounds ax.set_xbound(-1,6) ax.set_ybound(-4,4) plt.show()

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• How to sort a list alphabetically and have additional lists sorted in the same order

  - by Carl

  I have 3 lists, each with equal elements: email addresses, salaries and IDs I'd like to sort the email addresses alphabetically and in some way sort the other 2 lists (salaries and IDs). E.g., Emails: [email protected] [email protected] Salaries: 50000 60000 IDs: 2 1 The puzzle: I'd like to sort Emails such that [email protected] is first and [email protected] is last and Salaries is 60000 then 50000 and IDs is 1 then 2. Additional detail: 1. Length of lists are the same and can be longer than two elements. 2. I will subsequently pass IDs to functions to retrieve further lists. Those lists won't need sorting as they will adopt the order of the IDs list.

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• Pylons redirect to 404 error page

  - by ensnare

  What function to I use to redirect to the default 404 error page? Sample code appreciated. Thank you!

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• List as a key to a dictionary

  - by williamx

  Let's say I have a list: a = ['apple', 'orange'] and a dictionary: d ={'apple': [2,4], 'carrot': [44,33], 'orange': [345,667]} How can I use the list a as a key to lookup in the dictionary d? I want the result to be written to a comma-separated textfile like this apple, orange 2, 44 4, 33

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• Connect to a running instance of Visual Studio 2003 using COM, build and read output

  - by codeape

  For Visual Studio 6.0, I can connect to a running instance like: o = GetActiveObject("MSDev.Application") What prog ID do I use for Visual Studio 2003? How do I execute a 'Build Solution' once I have the COM object that references the VS2003 instance? How do I get the string contents of the build output window after executing the build solution command? Yes, I am aware that I can build a solution from the command line. But in this case, I need to connect to a running instance of Visual Studio. EDIT: found and submitted an answer, see below.

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• How can I test to see if a class contains a particular attribute?

  - by BryanWheelock

  How can I test to see if a class contains a particular attribute? In [14]: user = User.objects.get(pk=2) In [18]: user.__dict__ Out[18]: {'date_joined': datetime.datetime(2010, 3, 17, 15, 20, 45), 'email': u'[email protected]', 'first_name': u'', 'id': 2L, 'is_active': 1, 'is_staff': 0, 'is_superuser': 0, 'last_login': datetime.datetime(2010, 3, 17, 16, 15, 35), 'last_name': u'', 'password': u'sha1$44a2055f5', 'username': u'DickCheney'} In [25]: hasattr(user, 'username') Out[25]: True In [26]: hasattr(User, 'username') Out[26]: False I'm having a weird bug where more attributes are showing up than I actually define. I want to conditionally stop this. e.g. if not hasattr(User, 'karma'): User.add_to_class('karma', models.PositiveIntegerField(default=1))

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• Introspection of win32com module / pythoncom module

  - by crystal

  Hi, what is the best way to see what all functions that can be performed using pythoncom module? Specifically, i was working with the win32com module to operate upon excel files. I was not able to find introspection for it as we do for the rest of the modules. Can anyone please suggest how can i retrieve this information?

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• Dynamically expanding Django forms

  - by RexE

  I would like to create a form where a user can enter an arbitrary # of items in separate textboxes. The user could add (and potentially remove) fields as needed. Something like this: I found the following different solutions: http://www.eggdrop.ch/blog/2007/02/15/django-dynamicforms/ http://dewful.com/?p=100 Is there another best practice I might not be aware of?

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• Open/Close database connection in django

  - by mp0int

  I am using Django and Postgresql as my DBMS. I wish to set a setting that enables to enable/disable database connection. When the connection is set to closed (in settings.py) the site will display a message such as "meintanence mode" or something like that. Django will not show any db connection error message (or mail them to admins). It is appreciated if django do not try to connect to the database at all.

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• PySide using Style Sheets to change QtoolBox

  - by efi_ex

  I'm Wondering if somebody knows a better reference than the QT one for style sheets. I try to change the background of the content from a QToolBox but background-color only changes the header of the toolbox and the background of the content it reveals is left in a standard color. I then tried to change the bg of QWidget which worked but left me with problems now at Radiobuttons and Checkboxes, i also think changing QWidget isn't a good solution. The first picture is with Qt standard colors (this is a maya tool) the second when i change QWidget http://i.imgur.com/MNlSedx.png?1 http://i.imgur.com/wuplpmw.png?1

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• XML document being parsed as single element instead of sequence of nodes

  - by Rob Carr

  Given xml that looks like this: <Store> <foo> <book> <isbn>123456</isbn> </book> <title>XYZ</title> <checkout>no</checkout> </foo> <bar> <book> <isbn>7890</isbn> </book> <title>XYZ2</title> <checkout>yes</checkout> </bar> </Store> I am getting this as my parsed xmldoc: >>> from xml.dom import minidom >>> xmldoc = minidom.parse('bar.xml') >>> xmldoc.toxml() u'<?xml version="1.0" ?><Store>\n<foo>\n<book>\n<isbn>123456</isbn>\n</book>\n<t itle>XYZ</title>\n<checkout>no</checkout>\n</foo>\n<bar>\n<book>\n<isbn>7890</is bn>\n</book>\n<title>XYZ2</title>\n<checkout>yes</checkout>\n</bar>\n</Store>' Is there an easy way to pre-process this document so that when it is parsed, it isn't parsed as a single xml element?

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• Skip sanitization for videos in html5lib

  - by pug

  I am using a wmd-editor in django, much like this one in which I am typing. I would like to allow the users to embed videos in it. For that I am using the Markdown video extension here. The problem is that I am also sanitizing user input using html5lib sanitization and it doesn't allow object tags which are required to embed the videos. One solution could be to check the input for urls of well-known video sites and skip the sanitization in those cases. Is there a better solution?

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• How to display total record count against models in django admin

  - by Rog

  Is there a neat way to make the record/object count for a model appear on the main model list in the admin module? I have found techniques for showing counts of related objects within sets in the list_display page (and I can see the total in the pagination section at the bottom of the same), but haven't come across a neat way to show the record count at the model list level.

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• how to round_corner a logo without leaving white background(transparent?) with it using pil?

  - by bdictator

  I got a square logo and I need to round_corner it, searched for a while and got the follow code "working": def round_corner_jpg(image, radius): """generate round corner for image""" mask = Image.new('RGB', image.size) #mask = Image.new('RGB', (image.size[0] - radius, image.size[1] - radius)) #mask = Image.new('L', image.size, 255) draw = aggdraw.Draw(mask) brush = aggdraw.Brush('black') width, height = mask.size draw.rectangle((0,0,width,height), aggdraw.Brush('')) #upper-left corner draw.pieslice((0,0,radius*2, radius*2), 90, 180, None, brush) #upper-right corner draw.pieslice((width - radius*2, 0, width, radius*2), 0, 90, None, brush) #bottom-left corner draw.pieslice((0, height - radius * 2, radius*2, height),180, 270, None, brush) #bottom-right corner draw.pieslice((width - radius * 2, height - radius * 2, width, height), 270, 360, None, brush) #center rectangle draw.rectangle((radius, radius, width - radius, height - radius), brush) #four edge rectangle draw.rectangle((radius, 0, width - radius, radius), brush) draw.rectangle((0, radius, radius, height-radius), brush) draw.rectangle((radius, height-radius, width-radius, height), brush) draw.rectangle((width-radius, radius, width, height-radius), brush) draw.flush() del draw return ImageChops.add(mask, image) then I saved the returned image object,however it has white background in it?how can i get rid of the white background? Thanks in advance~

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• Source for Names to use in web scraping

  - by PyNEwbie

  Can anyone suggest a good source of names that I can use to help analyze some tables on web pages. The first column of the tables I am scraping have names alone, names and titles or just titles. The names can be as varied as John Smith to Vikram Saksena. I have been poking around for a compiled list of words that can be found in proper names.

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• Jinja2 returns "None" string for Google App Engine models

  - by Brian M. Hunt

  Google App Engine models, likeso: from google.appengine.ext.db import Model class M(): name = db.StringProperty() Then in a Jinja2 template called from a Django view with an in instance of M passed in as m: The name of this M is {{ m.name }}. When m is initialized without name being set, the following is printed: The name of this M is None. The preferable and expected output (and the output when using Django templates) would be/is: The name of this M is . Do you know why this is happening, and how to get the preferred & expected output?

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• Scipy sparse... arrays?

  - by spitzanator

  Hey, folks. So, I'm doing some Kmeans classification using numpy arrays that are quite sparse-- lots and lots of zeroes. I figured that I'd use scipy's 'sparse' package to reduce the storage overhead, but I'm a little confused about how to create arrays, not matrices. I've gone through this tutorial on how to create sparse matrices: http://www.scipy.org/SciPy_Tutorial#head-c60163f2fd2bab79edd94be43682414f18b90df7 To mimic an array, I just create a 1xN matrix, but as you may guess, Asp.dot(Bsp) doesn't quite work because you can't multiply two 1xN matrices. I'd have to transpose each array to Nx1, and that's pretty lame, since I'd be doing it for every dot-product calculation. Next up, I tried to create an NxN matrix where column 1 == row 1 (such that you can multiply two matrices and just take the top-left corner as the dot product), but that turned out to be really inefficient. I'd love to use scipy's sparse package as a magic replacement for numpy's array(), but as yet, I'm not really sure what to do. Any advice? Thank you very much!

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• How long should it take for someone to be able to type code from memory?

  - by LordSnoutimus

  Hi, I understand that this question could be answered with a simple sentence and that it may be viewed as subjective, however, I am a young student who is interested in pursuing a career in programming and wondered how long it took some of you to get to the level of experience you are now?. I ask this because I am currently working on building an application in Java on the Android platform and it bothers me that I am constantly having to look up how to write a certain section of code in my application such as writing to a database, or how the if loop should be structured. My question really is, how long did it take for you to become experienced enough to actually know exactly how your next line of code was going to look, before you even wrote it?

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• How can I prompt for input using Selenium/Webdriver and use the result?

  - by Tempus

  I would like to allow for user input and make some decisions based on it. If I do this: driver.execute_script("prompt('Enter smth','smth')") I get a nice prompt, but I cannot use it's value. Is there any way of showing an input box to the user, and use the value typed there? EDIT: This is my script: from selenium.webdriver import Firefox if __name__ == "__main__": driver = Firefox() driver.execute_script("window.promptResponse=prompt('Enter smth','smth')") a = driver.execute_script("var win = this.browserbot.getUserWindow(); return win.promptResponse") print "got back %s" % a And this exits with the following exception: a = driver.execute_script("var win = this.browserbot.getUserWindow(); return win.promptResponse") File "c:\python26\lib\site-packages\selenium-2.12.1-py2.6.egg\selenium\webdriver\remote\webdriver.py", line 385, in ex ecute_script {'script': script, 'args':converted_args})['value'] File "c:\python26\lib\site-packages\selenium-2.12.1-py2.6.egg\selenium\webdriver\remote\webdriver.py", line 153, in ex ecute self.error_handler.check_response(response) File "c:\python26\lib\site-packages\selenium-2.12.1-py2.6.egg\selenium\webdriver\remote\errorhandler.py", line 110, in check_response if 'message' in value: TypeError: argument of type 'NoneType' is not iterable What am I not doing right?

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• Trace/BPT trap when running feedparser inside a Thread object

  - by simao

  Hello, I am trying to run a Thread to parse a list of links using the universal feed parser, but when I start the thread I get a Trace/BPT trap. Here's the code I am using: class parseRssFiles(Thread): def __init__ (self,rssLinks): Thread.__init__(self) self.rssLinks = rssLinks def run(self): self.rssContents = [ feedparser.parse(link) for link in rssLinks] Is there any other way to do this? Link to the report generated by Mac OS X 10.6.2: http://simaom.com/trace.txt Thanks

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• How to create a custom admin configuration panel in Django?

  - by Matteo

  Hi, I would like to create a configuration panel for the homepage of the web-app I'm designing with Django. This configuration panel should let me choose some basic options like highlighting some news, setting a showcase banner, and so on. Basically I don't need an app with different rows, but just a panel page with some configuration options. The automatically generated administration area created by Django doesn't seem to handle this feature as far as I can see, so I'm asking you for some directions. Any hint is highly appreciated. Thank you in advance. Matteo

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• a more pythonic way to express conditionally bounded loop?

  - by msw

  I've got a loop that wants to execute to exhaustion or until some user specified limit is reached. I've got a construct that looks bad yet I can't seem to find a more elegant way to express it; is there one? def ello_bruce(limit=None): for i in xrange(10**5): if predicate(i): if not limit is None: limit -= 1 if limit <= 0: break def predicate(i): # lengthy computation return True Holy nesting! There has to be a better way. For purposes of a working example, xrange is used where I normally have an iterator of finite but unknown length (and predicate sometimes returns False).

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• missing elements from pcap?

  - by Matthew

  When I check the attributes available to the module pcap, I expect to see something like 'DLT_AIRONET_HEADER', 'DLT_APPLE_IP_OVER_IEEE1394', 'DLT_ARCNET', 'DLT_ARCNET_LINUX', 'DLT_ATM_CLIP', 'DLT_ATM_RFC1483', 'DLT_AURORA', 'DLT_AX25', 'DLT_CHAOS', 'DLT_CISCO_IOS', 'DLT_C_HDLC', 'DLT_DOCSIS', 'DLT_ECONET', 'DLT_EN10MB', 'DLT_EN3MB', 'DLT_ENC', 'DLT_FDDI', 'DLT_FRELAY', 'DLT_IEEE802', 'DLT_IEEE802_11', 'DLT_IEEE802_11_RADIO', 'DLT_IEEE802_11_RADIO_AVS', 'DLT_IPFILTER', 'DLT_IP_OVER_FC', 'DLT_JUNIPER_ATM1', 'DLT_JUNIPER_ATM2', 'DLT_JUNIPER_ES', 'DLT_JUNIPER_GGSN', 'DLT_JUNIPER_MFR', 'DLT_JUNIPER_MLFR', 'DLT_JUNIPER_MLPPP', 'DLT_JUNIPER_MONITOR', 'DLT_JUNIPER_SERVICES', 'DLT_LINUX_IRDA', 'DLT_LINUX_SLL', 'DLT_LOOP', 'DLT_LTALK', 'DLT_NULL', 'DLT_PFLOG', 'DLT_PPP', 'DLT_PPP_BSDOS', 'DLT_PPP_ETHER', 'DLT_PPP_SERIAL', 'DLT_PRISM_HEADER', 'DLT_PRONET', 'DLT_RAW', 'DLT_RIO', 'DLT_SLIP', 'DLT_SLIP_BSDOS', 'DLT_SUNATM', 'DLT_SYMANTEC_FIREWALL', 'DLT_TZSP', 'builtins', 'doc', 'file', 'name', '_newclass', '_object', '_pcap', '_swig_getattr', '_swig_setattr', 'aton', 'dltname', 'dltvalue', 'findalldevs', 'lookupdev', 'lookupnet', 'ntoa', 'pcapObject', 'pcapObjectPtr'] With note on pcapObject. However, all I get when running dir(pcap) is ['DLT_ARCNET', 'DLT_AX25', 'DLT_CHAOS', 'DLT_EN10MB', 'DLT_EN3MB', 'DLT_FDDI', 'DLT_IEEE802', 'DLT_LINUX_SLL', 'DLT_LOOP', 'DLT_NULL', 'DLT_PFLOG', 'DLT_PFSYNC', 'DLT_PPP', 'DLT_PRONET', 'DLT_RAW', 'DLT_SLIP', 'author', 'builtins', 'copyright', 'doc', 'file', 'license', 'name', 'url', 'version', 'bpf', 'dltoff', 'ex_name', 'lookupdev', 'pcap', 'sys'] Noting the lack of pcapObject. Why is this? What could cause this?

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• Does Mailman have an API or an export lists, users and owners option?

  - by Ritesh M Nayak

  I am trying to migrate a legacy mailing list to a new web forum software and was wondering if mailman has an export option or an API to get all lists, owners, members and membership types.

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