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  • Do or can robots cause considerable performance issues?

    - by Anicho
    So the question in the title is exactly what I am trying to find out. My case is: At work we are in a discussion with team members who seem to think bots will cause us problems relating to performance when running on our services website. Out setup: Lets say I have site www.mysite.co.uk this is a shop window to our online services which sit on www.mysiteonline.co.uk. When people search in google for mysite they see mysiteonline.co.uk as well as mysite.co.uk. Cases against stopping bots crawling: We don't store gb's of data publicly available on the web Most friendly bots, if they were to cause issues would have done so already In our instance the bots can't crawl the site because it requires username & password Stopping bots with robot .txt causes an issue with seo (ref.1) If it was a malicious bot, it would ignore robot.txt or meta tags anyway Ref 1. If we were to block mysiteonline.co.uk from having robots crawl this will affect seo rankings and make it inconvenient for users who actively search for mysite to find mysiteonline. Which we can prove is the case for a good portion of our users.

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  • DIVIDE vs division operator in #dax

    - by Marco Russo (SQLBI)
    Alberto Ferrari wrote an interesting article about DIVIDE performance in DAX. This new function has been introduced in SQL Server Analysis Services 2012 SP1, so it is available also in Excel 2013 (which still doesn’t have other features/fixes introduced by following Cumulative Updates…). The idea that instead of writing: IF ( Sales[Quantity] <> 0, Sales[Amount] / Sales[Quantity], BLANK () ) you can write: DIVIDE ( Sales[Amount], Sales[Quantity] ) There is a third optional argument in DIVIDE that defines the result in case the denominator (second argument) is zero, and by default its value is BLANK, so I omitted the third argument in my example. Using DIVIDE is very important, especially when you use a measure in MDX (for example in an Excel PivotTable) because it raise the chance that the non empty evaluation for the result is evaluated in bulk mode instead of cell-by-cell. However, from a DAX point of view, you might find it’s better to use the standard division operator removing the IF statement. I suggest you to read Alberto’s article, because you will find that an expression applying a filter using FILTER is faster than using CALCULATE, which is against any rule of thumb you might have read until now! Again, this is not always true, and depends on many conditions – trying to simplify, we might say that for a simple calculation, the query plan generated by FILTER could be more efficient – but, as usual, it depends, and 90% of the times using FILTER instead of CALCULATE produces slower performance. Do not take anything for granted, and always check the query plan when performance are your first issue!

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  • Skype message sync and notifications - Windows 8

    - by Raykud
    The problem is that my messages don't seem to sync and neither do I get notifications from the Windows Store App. I have both, the desktop program and the Windows Store App, the problem is that whenever someone messages me I do not receive a notification of the App but I get one from the desktop program. The Skype app is running in the background and does not have disabled the notifications neither have turned on sleep notifications. I have to manually open the app and moreover, open the chat window of the one who is talking to me, then wait like 10 minutes and then the chat will get syncronized. in short: Notifications don't work even: if computer unlocked and Skype is running in background if computer unlocked and Skype is running in foreground These doesn't seem to help: Reboot doesn't affects skype. Having only the App opened. Uninstalling/reinstalling Is there a way to fix this? or is this an issue with the Skype app in Windows 8?

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  • In Windows 8, can you use a different default browser for Metro/WinRT apps than for normal desktop apps?

    - by Joel Coehoorn
    I'm playing with the windows 8 consumer preview, and one thing I've noticed is that by default the metro/winRT apps respect my choice of Chrome as my default browser. That's probably a good thing for the default, out of the box behavior for Windows. However, what I'm finding as I play with the preview is that, when I'm using a metro/WinRT/tiled app (and only when I'm using one of these apps) I would prefer internet links opened from within those apps use the metro version of Internet Explorer. This issue isn't so much that I like IE here as it is the experience transitioning between the metro world and the desktop world is jarring. I want to limit the transitions. Perhaps when the metro version of firefox is released I might prefer it instead. The point is that I want a different default browser setting for the WinRT stuff than I do for the legacy desktop stuff. Is this possible?

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  • Hyper-V Manager right clicking on remote VM causes MMC error

    - by Greg Bray
    I have a Windows 2008 R2 Enterprise Server with SP1 that I log into and use to manage virtual machines running on multiple HyperV servers on our domain. Sometimes when I right click on a remote VM the HyperV Manager will crash and display the following error message: If I use the Actions menu on the lower right it works just fine, but for some reason right clicking cause MMC to stop working. Is there any way to fix this issue? Here are the full details of the error message. Description: Stopped working Problem signature: Problem Event Name: CLR20r3 Problem Signature 01: mmc.exe Problem Signature 02: 6.1.7600.16385 Problem Signature 03: 4a5bc808 Problem Signature 04: Microsoft.Virtualization.Client Problem Signature 05: 6.1.0.0 Problem Signature 06: 4ce7c9e3 Problem Signature 07: 342 Problem Signature 08: 1f Problem Signature 09: System.OverflowException OS Version: 6.1.7601.2.1.0.274.10 Locale ID: 1033 Read our privacy statement online: http://go.microsoft.com/fwlink/?linkid=104288&clcid=0x0409 If the online privacy statement is not available, please read our privacy statement offline: C:\Windows\system32\en-US\erofflps.txt

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  • Silverlight Cream for May 18, 2010 -- #864

    - by Dave Campbell
    In this Issue: Jesse Liberty, Chris Koenig, Kyle McClellan, Kunal Chowdhury(-2-), Tim Heuer, and Jonathan van de Veen. Shoutout: René Schulte has posted a SLARToolkit Beginner's Guide Erik Mork and the Sparkling Podcast crew posted Silverlight Week – Silverlight Android? John Papa opens up a dialog: Ask the Experts on Silverlight TV ... get your questions answered! From SilverlightCream.com: Windows Phone 7 For Silverlight Programmers Jesse Liberty's starting a series on WP7, so you obviously don't want to miss this... source, commentary, external links, how-to's... what more could you ask for?? WP7 Part 3: Navigation Chris Koenig is revamping his WP7 application to use Community Megaphone instead of Nerd Dinner and in this episode 3 he's looking into Navigation ... definitely good stuff here. RIA Services Authentication Out-Of-Browser Kyle McClellan has code up demonstrating how to get around the fact that the Browser networking stack handles cookies differently than the client networking stack used OOB, and achieve forms authentication OOB. How to work with the Silverlight BusyIndicator? Kunal Chowdhury has a post up talking about the busy indicator and how to use it to show an active indicator while disabling other content. Drag and Drop Operation in Silverlight ListBox In a second entry, Kunal Chowdhury has a nice long post displaying drag-and-drop within and between ListBox controls. Silverlight 4 Tools, WCF RIA Services and Themes Released As usual, Tim Heuer has a great post up about the new releases not only for those with 'clean' machines, but also instructions for those that have been playing along. Advanced printing in Silverlight 4 Just after a post on printing yesterday, Jonathan van de Veen has a post up at SilverlightShow on printing as well, and is demonstrating fitting the text to the page and printing multiple pages. Stay in the 'Light! Twitter SilverlightNews | Twitter WynApse | WynApse.com | Tagged Posts | SilverlightCream Join me @ SilverlightCream | Phoenix Silverlight User Group Technorati Tags: Silverlight    Silverlight 3    Silverlight 4    Windows Phone MIX10

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  • Ubuntu 12.04, xbmc, opengl, intel motherboard

    - by Sean Hagen
    I've got an HTPC that I built myself, with a Asus P5G41T-M Motherboard. It's got an on-board HDMI port, and I've been using that with no problems. I started out with Mythbuntu ( an older version ), and recently updated to 12.04.1 LTS without any issues. I've been thinking about trying out XBMC for a while, and I decided to give it a go. Unfortunately, I seem to be running into quite a few issues. I got XBMC installed from the repos without any issues, but when I try to run it from a console, a box pops up with the following: XBMC needs hardware accelerated OpenGL rendering. Install an appropriate graphics driver. Please consule XBMC Wiki for supported hardware http://wiki.xbmc.org/?title=Supported_hardware In the console, it prints out the following: X Error of failed request: BadRequest (invalid request code or no such operation) Major opcode of failed request: 136 (GLX) Minor opcode of failed request: 19 (X_GLXQueryServerString) Serial number of failed request: 12 Current serial number in output stream: 12 When I run vainfo, I get this: libva: VA-API version 0.32.0 libva: va_getDriverName() returns 0 libva: Trying to open /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so libva: va_openDriver() returns 0 vainfo: VA-API version: 0.32 (libva 1.0.15) vainfo: Driver version: Intel i965 driver - 1.0.15 vainfo: Supported profile and entrypoints VAProfileMPEG2Simple : VAEntrypointVLD VAProfileMPEG2Main : VAEntrypointVLD The file /usr/lib/x86_64-linux-gnu/dri/i964_drv_video.so exists: # ls -l /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so -rw-r--r-- 1 root root 628728 Mar 29 2012 /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so And in /var/log/Xorg.0.log the following error pops up: GLX error: Can not get required symbols. I'm not really sure where to go from here. I've tried searching all over for how to fix this problem. I've done "apt-get --reinstall xserver-xorg" ( as well as a few other video driver packages ) a few times, and no change. Any help in getting this issue sorted out would be awesome.

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  • mime-attachment incompatibility on forwarded messages from android to an iphone

    - by Peter Carrero
    A couple of guys got the evo android in the office. I got an iphone. When I receive a forwarded email from one of those phones, the forwarded piece comes as a mime-attachment that the iphone cannot open. I also tried this with a motorola droid and got the same result. I am not sure if the issue is the android sending the message on the wrong format or the iphone not being able to understand a mime type that it should... Has anyone experienced this, and, most importantly, found a fix/workaround? Thanks.

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  • Creating Shared Wifi Connection on Windows 7 WITHOUT wep/wpa security?

    - by Duncan
    Ok, for some reason I just can't figure this out on Windows 7. Never had an issue with it on Windows XP, never tried in Vista. I realize that I need to create an Ad-Hoc setup which I can do. However I can't get it to share the wireless signal on my laptop. Even if I go into the adapter settings. I need (well, want) to connect my old Psion netBook to my home network and due to the wireless card, I can't have any form of security. Thanks in advance!

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  • Enable: Asp.net connection pool monitoring with performance monitor

    - by BlackHawkDesign
    If this question is at the wrong forum, be free to tell me. I'm a c# developer, but I'm running in a system management issue here. Intro: Im suspecting that an asp.net application is having some issues with the connection pool and that the pool is flooding from time to time. So to make sure, I want to monitor the connection pool. After some searching I found this article : http://blog.idera.com/sql-server/performance-and-monitoring/ensure-proper-sql-server-connection-pooling-2/ Basicly it explains stuff about connection pools and how you can monitor the application pool with performance monitor. The problem: So I logged in to the asp.net server(The sql database is hosted on a different server) which hosts the website. Started performance monitor. But when I want to select 'Current # pooled and nonpooled connections', I have no instance to select. There fore I can't add it. Question How can I create/supply an instance so I can monitor the connection pool? Thanks in advance BHD

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  • Why does this monitor go to sleep but won't wake up, event though all related power options are turned off?

    - by VoidKing
    We have a machine, Windows 7 (64-bit) with ASUS motherboard, in our building that only sometimes seems to go to sleep, but won't wake up. The machine is still running but shaking the mouse or hitting keys on the keyboard won't wake it up. I have tried for days to isolate the problem, but every time we get to a "let's try this" scenario, it happens again, later. All power options related to display being off are set to never, except the simple, "turn display off after..." setting. That is, the hard drive is set to never turn off, and the computer is set to never sleep nor hibernate. All drivers seem to be up to date, but I am afraid I will hose the machine if I do a BIOS update (plus I figured that will probably have nothing to do with the issue and only make something else break). Wasn't sure if there was something obvious I was missing?

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  • Problem with MSDE 2000 5 minute keepalive over ISDN

    - by mcrick
    We have a SQL Server transactionally pushing replicate data to an MSDE 2000 SP3a subscriber over ISDN. Prior to a recent upgrade to bring us to the MSDE 2000 level we pushed to MSDE 1. We are finding that there is now a 5 minute keepalive being instigated from MSDE 2000 which we cannot account for. Further, we can find no way to either disable it or lengthen the keepalive interval. Not surprisingly, we are finding a marked increase in ISDN line costs due to these previously non-existent keepalive packets! Please note that we are assuming that it is an MSDE 2000 server issue, but it could equally be some behaviour related to the way that replication is operating on MSDE 2000. Unfortunately, as yet, we have not identified a replication configuration parameter that affects the keepalive in any way. Can anyone advise how we might indentify a root cause for this problem (and ideally a fix)?

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  • Problem with MSDE 2000 5 minute keepalive over ISDN

    - by mcrick
    We have a SQL Server transactionally pushing replicate data to an MSDE 2000 SP3a subscriber over ISDN. Prior to a recent upgrade to bring us to the MSDE 2000 level we pushed to MSDE 1. We are finding that there is now a 5 minute keepalive being instigated from MSDE 2000 which we cannot account for. Further, we can find no way to either disable it or lengthen the keepalive interval. Not surprisingly, we are finding a marked increase in ISDN line costs due to these previously non-existent keepalive packets! Please note that we are assuming that it is an MSDE 2000 server issue, but it could equally be some behaviour related to the way that replication is operating on MSDE 2000. Unfortunately, as yet, we have not identified a replication configuration parameter that affects the keepalive in any way. Can anyone advise how we might indentify a root cause for this problem (and ideally a fix)?

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  • Ubuntu 12.04 NVIDIA GeForce Go 7600 black screen during boot

    - by Florian Schmidt
    I'm using Ubuntu as the only operating system since two years. In the first Ubuntu versions I had seen my BIOS screen and the boot screens. Actually im using Ubuntu 12.04 and my screen stays black until Ubuntu is started (both screens are missing). I guess this situation appeared the first time in Ubuntu 11 (not sure). I searched via google and tried the popular activities but was not able to fix my issue. I opened the laptop and checked all connections. I'm using boot option nomodeset. I had a look through many many web pages. I don't know how to continue and hope somebody could be helpful. My hardware: Acer Aspire 9300 AMD Turion 64 x2 NVIDIA GeForce Go 7600 (using proposed driver) lspci | grep NVIDIA 00:00.0 RAM memory: NVIDIA Corporation C51 Host Bridge (rev a2) 00:00.1 RAM memory: NVIDIA Corporation C51 Memory Controller 0 (rev a2) 00:00.2 RAM memory: NVIDIA Corporation C51 Memory Controller 1 (rev a2) 00:00.3 RAM memory: NVIDIA Corporation C51 Memory Controller 5 (rev a2) 00:00.4 RAM memory: NVIDIA Corporation C51 Memory Controller 4 (rev a2) 00:00.5 RAM memory: NVIDIA Corporation C51 Host Bridge (rev a2) 00:00.6 RAM memory: NVIDIA Corporation C51 Memory Controller 3 (rev a2) 00:00.7 RAM memory: NVIDIA Corporation C51 Memory Controller 2 (rev a2) 00:02.0 PCI bridge: NVIDIA Corporation C51 PCI Express Bridge (rev a1) 00:03.0 PCI bridge: NVIDIA Corporation C51 PCI Express Bridge (rev a1) 00:04.0 PCI bridge: NVIDIA Corporation C51 PCI Express Bridge (rev a1) 00:09.0 RAM memory: NVIDIA Corporation MCP51 Host Bridge (rev a2) 00:0a.0 ISA bridge: NVIDIA Corporation MCP51 LPC Bridge (rev a3) 00:0a.1 SMBus: NVIDIA Corporation MCP51 SMBus (rev a3) 00:0a.3 Co-processor: NVIDIA Corporation MCP51 PMU (rev a3) 00:0b.0 USB controller: NVIDIA Corporation MCP51 USB Controller (rev a3) 00:0b.1 USB controller: NVIDIA Corporation MCP51 USB Controller (rev a3) 00:0d.0 IDE interface: NVIDIA Corporation MCP51 IDE (rev f1) 00:0e.0 IDE interface: NVIDIA Corporation MCP51 Serial ATA Controller (rev f1) 00:10.0 PCI bridge: NVIDIA Corporation MCP51 PCI Bridge (rev a2) 00:10.1 Audio device: NVIDIA Corporation MCP51 High Definition Audio (rev a2) 00:14.0 Bridge: NVIDIA Corporation MCP51 Ethernet Controller (rev a3) 03:00.0 VGA compatible controller: NVIDIA Corporation G73 [GeForce Go 7600] (rev a1) So my question is what to do to fix the black screen during boot?

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  • SQL Azure Service Issues &ndash; 10.27.2012 (Restored Now)

    - by ToStringTheory
    Please note that if you have a Windows Azure website, or use SQL Azure, your site may be experiencing downtime currently.  Notice I just called in regarding one of my public facing internet sites, because the site was failing to load anything but its error page, I couldn’t connect to the database to inspect application error logs, and the Windows Azure Management portal won’t load the SQL Azure extension. After speaking to the representative, he also mentioned that they were also having some problems updating the Service Dashboard which shows service up/down time, and for now, they are posting messages at http://account.windowsazure.com.  Please note that this issue may only be effecting certain regions.  Last, I may have misheard the representative, but he said that the outage was being categorized as a level 8, and if I heard correctly, I think he said that level 8 was the worst level.  I can’t say for sure on this though, because the phone connection to their support number was bad – large amounts of white noise. Good Luck! Update It appears that this outage may also be effecting the following services: SQL Database, Service Bus, Datamarket, Windows Azure Marketplace, Shared Caching, Access Control 2.0, and SQL Reporting. The note on the account page says for the South Central US region, however, I believe the representative I spoke to also mentioned North Central. As I said before though, the connection was bad. Update 2 My site regained connectivity about an hour ago, and it appears that the service dashboard is back in operation with correct status and history. It does appear that I misheard on the phone regarding multiple regions, so chances are this only effected a percentage of the platform. All in all, if this WAS their worst level of a problem, they really got it fixed and back up pretty fast. All in all, I understand that it is inherent for a complex system such as Azure to have ups and downs, but at the end of the day, I am still happy to support Azure to its fullest!

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  • How can I prevent my volume from changing when initiating a Skype call?

    - by Daniel
    I already know about the option in Control Panel Sound Communications, so please don't bother pointing me there. I am using the Skype Modern UI app and whenever I start a call, it lowers the volume of anything else that I have active. How can I resolve this issue? Also, not sure if this is related, but any Modern UI music apps also lower their own volume when they are not in the foreground. This seems relevant: http://blogs.msdn.com/b/windowsappdev/archive/2012/08/23/media-playback-what-you-need-to-know-about-playing-media-to-make-your-app-shine-in-windows-8.aspx

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  • grouping by date in excel and removing time in a pivot table

    - by Ashley DeVan
    My data looks like this: count Added Date 1 8/26/09 3:46 PM 2 8/21/09 6:50 PM 3 8/21/09 3:04 PM 4 8/21/09 3:21 PM 5 5/1/09 6:56 AM 6 5/1/09 8:12 AM 7 5/1/09 8:00 AM 8 5/1/09 8:18 AM 9 5/1/09 8:58 AM 10 5/1/09 8:58 AM 11 5/1/09 9:06 AM 12 5/1/09 9:44 AM 13 5/1/09 9:50 AM 14 5/1/09 11:17 AM 15 5/1/09 11:27 AM 16 5/1/09 11:29 AM 17 5/1/09 11:39 AM 18 5/1/09 12:10 PM 19 5/1/09 12:33 PM When I do a pivot table, I cannot get it to sum by day, it breaks it up by minute. I've even tried parsing the field, but the time always creates an issue. How to I get my pivot table to give me a count by day and ignore the time stamp?

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  • Norton Security Suite Symantec Download Manager Error: "Error writing to disk"

    - by Stephen Pace
    My broadband provider (Comcast) decided to switch their 'included with service' security suite from McAfee to Norton Security Suite. Their email directed me to a site that downloaded the Symantec Download Manager (NortonDL.exe) and that went fine. I'm running Windows 7 32-bit and running this application pops up the standard User Account Control message and the software is correctly identified as coming from Symantec. I answer 'yes' to allow the software to install and upon launch immediately get an "Error writing to disk" error. I searched the Internet for this error, but mainly I find Comcast users complaining about the same issue with no resolution other than to call Symantec. I found no one suggesting a successful workaround and it appeared that most of the support calls took up to three hours. I'd like to avoid that if possible. Ideas? To be honest, I'm getting close to bagging this installation and just moving to Microsoft Security Essentials.

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  • sensors reporting weird temperatures

    - by Felix
    lm-sensors is reporting weird temps for me: $ sensors coretemp-isa-0000 Adapter: ISA adapter Core 0: +38.0°C (high = +72.0°C, crit = +100.0°C) coretemp-isa-0001 Adapter: ISA adapter Core 1: +35.0°C (high = +72.0°C, crit = +100.0°C) coretemp-isa-0002 Adapter: ISA adapter Core 2: +32.0°C (high = +72.0°C, crit = +100.0°C) coretemp-isa-0003 Adapter: ISA adapter Core 3: +42.0°C (high = +72.0°C, crit = +100.0°C) w83627dhg-isa-0290 Adapter: ISA adapter Vcore: +1.10 V (min = +0.00 V, max = +1.74 V) in1: +1.62 V (min = +0.06 V, max = +0.17 V) ALARM AVCC: +3.34 V (min = +2.98 V, max = +3.63 V) VCC: +3.34 V (min = +2.98 V, max = +3.63 V) in4: +1.83 V (min = +1.30 V, max = +1.15 V) ALARM in5: +1.26 V (min = +0.83 V, max = +1.03 V) ALARM in6: +0.11 V (min = +1.22 V, max = +0.56 V) ALARM 3VSB: +3.30 V (min = +2.98 V, max = +3.63 V) Vbat: +3.18 V (min = +2.70 V, max = +3.30 V) fan1: 0 RPM (min = 0 RPM, div = 128) ALARM fan2: 1117 RPM (min = 860 RPM, div = 8) fan3: 0 RPM (min = 10546 RPM, div = 128) ALARM fan4: 0 RPM (min = 10546 RPM, div = 128) ALARM fan5: 0 RPM (min = 10546 RPM, div = 128) ALARM temp1: +88.0°C (high = +20.0°C, hyst = +4.0°C) ALARM sensor = diode temp2: +25.0°C (high = +80.0°C, hyst = +75.0°C) sensor = diode temp3: +121.5°C (high = +80.0°C, hyst = +75.0°C) ALARM sensor = thermistor cpu0_vid: +2.050 V Please note temp3. How can I know what temp3 is, and why it is so high? The system is really stable (which I guess it wouldn't be at those temps). Also, note the really decent core temps, which suggest a healthy system as well. My guess is that the readout is wrong. On another computer it reported temperatures below 0 degrees centigrade, which was not possible, considering the environment temperature of ~22-24. Is this some known bug/issue? Should I try some Windows programs (like CPU-Z) and see they give similar results?

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  • Sending email using smpt (Gmail) from Hudson CI

    - by jensendarren
    How can I set up Hudson CI so that I can send out emails from the server following a build failure? At the moment all I get is the following error: com.sun.mail.smtp.SMTPSendFailedException: 530 5.7.0 Must issue a STARTTLS command first One solution is to start Hudson as follows: java -Dmail.smtp.starttls.enable="true" -jar /usr/share/hudson/hudson.war However, I am already using the following to start Hudson: sudo /etc/init.d/hudson start I am thinking the solution is to somehow set the system property mail.smtp.starttls.enable in a property file somewhere, but I have no idea how to do that. What are my options? Thank you all in advance!

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  • Windows 2003 Server R2SP2 throws even ID 2269 after installing Excel WebPart in MOSS3

    - by Phil
    We recently added an Excel workbook webpart (read only excel file - no editing) on our Sharepoint 2007 server. Once we did that, approximately 3-4 times an hour event ID 2269 is shown in the Application Log and a few minutes after that, an event id 1002 is displayed in the system long and the Sharepoint Offfce Servers Application pool shuts down. We've already check the "Bypass traverse checking and DCOM settings) per the MS KB and I have opened a ticket with MS Support. Problem is that MS Suppoert (sharepoint) thinks it is an IIS problem and the IIS people think it is a Sharepoint issue. Anyone else seen this problem? If we remove the Excel webpart, everything goes back to normal. The App Pools, SP and SP Central Admin sites are all using the same domain service account. Thanks in advance, Phil

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  • Questioning pythonic type checking

    - by Pace
    I've seen countless times the following approach suggested for "taking in a collection of objects and doing X if X is a Y and ignoring the object otherwise" def quackAllDucks(ducks): for duck in ducks: try: duck.quack("QUACK") except AttributeError: #Not a duck, can't quack, don't worry about it pass The alternative implementation below always gets flak for the performance hit caused by type checking def quackAllDucks(ducks): for duck in ducks: if hasattr(duck,"quack"): duck.quack("QUACK") However, it seems to me that in 99% of scenarios you would want to use the second solution because of the following: If the user gets the parameters wrong then they will not be treated like a duck and there will be no indication. A lot of time will be wasted debugging why there is no quacking going on until the user finally realizes his silly mistake. The second solution would throw a stack trace as soon the user tried to quack. If the user has any bugs in their quack() method which cause an AttributeError then those bugs will be silently swallowed. Once again time will be wasted digging for the bug when the second solution would simply give a stack trace showing the immediate issue. In fact, it seems to me that the only time you would ever want to use the first method is when: The block of code in question is in an extremely performance critical section of your application. Following the principal of "avoid premature optimization" you would only realize this of course, after you had implemented the safer approach and found it to be a bottleneck. There are many types of quacking objects out there and you are only interested in quacking objects that quack with a very specific set of arguments (this seems to be a very rare case to me). Given this, why is it that so many people prefer the first approach over the second approach? What is it that I am missing? Also, I realize there are other solutions (such as using abcs) but these are the two solutions I seem to see most often for the basic case.

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  • Designing javascript chart library

    - by coolscitist
    I started coding a chart library on top of d3js: My chart library. I read Javascript API reusability and Towards reusable charts. However, I am NOT really following the suggestions because I am not really convinced about them. This is how my library can be used to create a bubble chart: var chart = new XYBubbleChart(); chart.data = [{"xValue":200,"yValue":300},{"xValue":400,"yValue":200},{"xValue":100,"yValue":310}]; //set data chart.dataKey.x = "xValue"; chart.dataKey.y = "yValue"; chart.elementId = "#chart"; chart.createChart(); Here are my questions: It does not use chaining. Is it a big issue? Every property and function is exposed publicly. (Example: width, height are exposed in Chart.js). OOP is all about abstraction and hiding, but I don't really see the point right now. I think exposing everything gives flexibility to change property and functionality inside subclasses and objects without writing a lot of code. What could be pitfalls of such exposure? I have implemented functions like: zooming, "showing info boxes when data point is clicked" as "abilities". (example: XYZoomingAbility.js). Basically, such "abilities" accept "chart" object, play around with public variables of "chart" to add functionality. What this allows me to do is to add an ability by writing: activateZoomAbility(chartObject); My goal is to separate "visualization" from "interactivity". I want "interactivity" like: zooming to be plugged into the chart rather than built inside the chart. Like, I don't want my bubble chart to know anything about "zooming". However, I do want zoomable bubble chart. What is the best way to do this? How to test and what to test? I have written mixed tests: jasmine and actual html files so that I can test manually on browser.

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  • How to install suggested packages in apt-get

    - by Alaa Ali
    EDIT: I solved my issue. I will answer my own question, but in 5 hours because I don't have permission now. I know the question has been asked before, but please hear me out. So I wanted to install screenlets. I ran sudo apt-get install screenlets, and this is what I got: The following extra packages will be installed: libart-2.0-2 libbonobo2-0 libbonobo2-common libbonoboui2-0 libbonoboui2-common libgnome2-0 libgnomecanvas2-0 libgnomecanvas2-common libgnomeui-0 libgnomeui-common libtidy-0.99-0 python-beautifulsoup python-evolution python-feedparser python-gmenu python-gnome2 python-numpy python-pyorbit python-rsvg python-tz python-utidylib screenlets-pack-basic Suggested packages: libbonobo2-bin python-gnome2-doc python-numpy-doc python-numpy-dbg python-nose python-dev gfortran python-pyorbit-dbg screenlets-pack-all python-dcop Recommended packages: python-numeric python-gnome2-extras The following NEW packages will be installed: libart-2.0-2 libbonobo2-0 libbonobo2-common libbonoboui2-0 libbonoboui2-common libgnome2-0 libgnomecanvas2-0 libgnomecanvas2-common libgnomeui-0 libgnomeui-common libtidy-0.99-0 python-beautifulsoup python-evolution python-feedparser python-gmenu python-gnome2 python-numpy python-pyorbit python-rsvg python-tz python-utidylib screenlets screenlets-pack-basic 0 upgraded, 23 newly installed, 0 to remove and 2 not upgraded. People say that Recommended packages are installed by default, but they are clearly not included in the NEW packages that will be installed above. I also decided to include the Suggested packages in the installation, so I ran sudo apt-get --install-suggests install screenlets instead, but I got a HUGE list of NEW packages that will be installed; that number is precisely 0 upgraded, 944 newly installed, 0 to remove and 2 not upgraded. Should'nt I be getting only around 10 extra packages?

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  • basic picture editing software for Mac

    - by George2
    Hello everyone, I am using a MacBook Pro running Mac OS X 10.5. I am new to this development environment, and previously worked on Windows. I want to do very basic image editing, like cut a portion of an image, add some text label to the image, circle some part of the image, etc. I am downloading acornfree from this Url, but when executing acornfree, it said the Mac OS I am using is not supported. Any ideas how to fix this issue or any other free image editing software to recommend (and could be used for my specific Mac OS platform)? http://flyingmeat.com/acorn/acornfree.html thanks in advance, George

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