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• Best way to restore individual folders via Time Machine after clean Lion install?

  - by A4J

  I'm doing a clean erase and install of Lion, and am looking for the best way to restore individual folders into my home directory via Time Machine. I've done a dummy run, clean Lion install, then 'browse other disks' in Time Machine, navigate to my home folder and 'restore' what I need, such as pictures/music and folders inside the .library folder (such as Mail and Keychains). However this method seems to give you odd permissions, like this: http://i43.tinypic.com/15y82v4.png Hence I wondered if anyone knows what the best method is to restore files and folders after a clean install. N.b I do not want to use the migration assistant, or 'restore OS from Time Machine' - as I specifically want to do a clean install, and just copy over what I need (some folders will be moved onto a separate disk to the OS, and some will remain on the same disk). Thanks in advance.

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• 2D Tile Map files for Platformer, JSON or DB?

  - by Stephen Tierney

  I'm developing a 2D platformer with some uni friends. We've based it upon the XNA Platformer Starter Kit which uses .txt files to store the tile map. While this is simple it does not give us enough control and flexibility with level design. Some examples: for multiple layers of content multiple files are required, each object is fixed onto the grid, doesn't allow for rotation of objects, limited number of characters etc. So I'm doing some research into how to store the level data and map file. Reasoning for DB: From my perspective I see less redundancy of data using a database to store the tile data. Tiles in the same x,y position with the same characteristics can be reused from level to level. It seems like it would simple enough to write a method to retrieve all the tiles that are used in a particular level from the database. Reasoning for JSON: Visually editable files, changes can be tracked via SVN a lot easier. But there is repeated content. Do either have any drawbacks (load times, access times, memory etc) compared to the other? And what is commonly used in the industry? Currently the file looks like this: .................... .................... .................... .................... .................... .................... .................... .........GGG........ .........###........ .................... ....GGG.......GGG... ....###.......###... .................... .1................X. #################### 1 - Player start point, X - Level Exit, . - Empty space, # - Platform, G - Gem

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• Automated git push attempt does not work - authentication issue

  - by at least three characters

  I'm trying to automate a very periodic git add/commit/push cycle using a shell script and cron under OS X 10.8.5. The script is as basic as one would expect it to be: cd /my/directory git add . git commit -m "a commit message with the date" git push -u origin master I've tried running it both as root as well as a non-root user. When I do this manually, I get a dialog box from OS X requesting that I authenticate the operation. Running the script (either using cron or just using sh) ends up sending a message (via mail) to whichever user's cron executed the script saying that it was unable to write a file in the .git directory because of a permissions issue (which is most likely manual execution requires authentication). Is there any way to circumvent this issue, or give the script permission to perform this operation without having me intervene each time?

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• why would you create two different subnets on the same physical network?

  - by xirtyllo

  I'm working at a messy location, one of the strange (for me) things is that on the same physical network there are two different subnets. Specifically some computers will have 10.0.0.0/24 and some others will have 172.16.0.0/24. There is only one DHCP server, which gives IPs on the 10.0.0.0/24 range, and there are two internet gateways, one with IP 172.16.0.1 and one with IP 10.0.0.1 . To give an example, I can easily swap one PC from one subnet to the other just by changing its IP and gateway settings. I am trying to imagine why they created the network this way, and which may be the possible advantages and/or drawbacks of having two different subnets on the same physical network. Any thoughts?

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• Different boot time for the same computer by different commands

  - by andrej

  As far as I am aware, there are 3 ways to check the computer boot time in windows. And they should give the same time, just in different formats. Why do I get different times, where do these commands get their time? wmic os get lastBootUpTime | find "+120" 20140823002317.596695+120 systeminfo | find /i "boot time" System Boot Time: 23.8.2014, 0:23:17 net statistics server | find /i "statistics since" Statistics since 22.8.2014 18:21:30 The first two are the same (0:23), but the third is different (18:21), and also accurate. Why? At boot, all tree show the same, but at some point, they change. I am using windows 7 ultimate, 64bit.

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• How does RAM fail?

  - by ethanlee16

  I have an issue with a Dell Inspiron 15 (1545) laptop that refuses to open any applications (save select Microsoft programs, e.g. Security Essentials, Ctrl Panel, Windows Explorer (not Internet), regedit, Event Viewer, etc.). I've run Microsoft Memory Diagnostics Tool and it found a 'hardware problem was detected.' Does this indicate that the RAM has failed? I notice when I open programs like Word, Excel, Internet Explorer, etc., it always give me an error from WerFault.exe saying The instruction at xxxxxxx referenced memory at xxxxxxxxx. The memory could not be written. and sometimes something about illegal instructions. If it is a hardware problem, does this mean that replacing the RAM is my only option? Again, I would also like to know if RAM can fail (like hard drives) and if malware can cause RAM to fail also.

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• Ask the Readers: What Operating System Do You Use?

  - by Mysticgeek

  The three most popular choices out there when it comes to computer operating systems, is Windows, Mac OS X, and Linux. What we want to know is…which operating system do you use? Photo by ~Dudu,,]* Computer users today have more choices than ever when it comes to the operating system they use. In the Windows world, there are three versions out there in daily use. A lot of businesses and home users use XP, completely avoided Vista, and are starting to migrate to Windows 7. While a lot of home users received their new computer with Vista pre-installed and are still using it. Others were quick to jump to Windows 7, and some don’t want to leave the comforts of XP. Desktop Linux distro’s have been consistently growing in popularity as versions like Ubuntu become more user friendly. And let us not forget the loyal Apple users who would never give up OS X. You may have to use a certain OS at the workplace, but when you get home, your options are a lot more open. And now with the ease of virtualization, it’s easy to run multiple operating systems on one machine. Each OS offers different advantages that people pick based on their needs. Today we want to know, which operating system(s) do you use? Let us know in the comments and join the discussion! Similar Articles Productive Geek Tips Easily Set Default OS in a Windows 7 / Vista and XP Dual-boot SetupGet the Version of Solaris RunningDisable System Restore in Windows 7Disable ProFTP on CentOSShut Down or Reboot a Solaris System TouchFreeze Alternative in AutoHotkey The Icy Undertow Desktop Windows Home Server – Backup to LAN The Clear & Clean Desktop Use This Bookmarklet to Easily Get Albums Use AutoHotkey to Assign a Hotkey to a Specific Window Latest Software Reviews Tinyhacker Random Tips DVDFab 6 Revo Uninstaller Pro Registry Mechanic 9 for Windows PC Tools Internet Security Suite 2010 Out of band Security Update for Internet Explorer 7 Cool Looking Screensavers for Windows SyncToy syncs Files and Folders across Computers on a Network (or partitions on the same drive) If it were only this easy Classic Cinema Online offers 100’s of OnDemand Movies OutSync will Sync Photos of your Friends on Facebook and Outlook

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• Dual boot OSX and Windows 7 natively

  - by Phill

  I'm considering getting one of those new fancy Mac Book Pro's with the fancy screens, but after reading some stuff on the internets about running Windows 7 with bootcamp: https://discussions.apple.com/thread/2770866?start=0&tstart=0 It seems you can't use the integrated graphics with windows, this causes windows to chew the battery life: I am afraid it is not possible. Since Apple introduced dual graphics chip laptops, they kept the low power/embedded GPU hidden under Window and they expose only the power hungry discrete GPU. It feels that this is being done on purpose so that it appears to users that OS X offers a better experience and battery life over Windows. So running bootcamp and windows kills the battery, running in parallels means you don't get accelerated 3d support (or something along those lines), so you don't get the performance out of it. I'm wondering: Is it possible to natively dual boot Windows 7 on a MBP, and if so would/does that give windows access to the integrated graphics to be able to not rape the battery?

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• Slow internet using Arch Linux

  - by GZaidman

  after a week or so of using Arch Linux I cant access the internet - it takes around 5 mins to load google (most of the other websites just give me a timeout), pacman's downloading speed range between 5-2Kbs, and pinging google takes around 9Kms. I'm connected using wireless network (wifi card is Intel Ultimate 6300 and router is Edimax 6524n). Every other Windows machine that's connected to the network (and even the T410 running Windows) is fine, so the problem lies in Linux. So far, i checked the resolv.conf file (my router ip address is listed), and the hosts file (pretty much default), and I disabled the ipv6 module. None of that helped. PS: i'm using NetworkManager (but the problem still occurs when connecting using wicd) running on Gnome3. Thanks in advance for any help you can provide! EDIT: something really strange happens whenever I ping google: i get an unknown host 'google.com', but the bit rate from the card jumps at the exact second I ping google (so far, the bit rate jumped to 54Mb/s from 1Mb/s over the course of 4 pings).

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• Running bridged-networking vmware player on a Linux machine with 2 interfaces

  - by Roman D

  I have got a laptop running Arch Linux with 2 interfaces: wireless (wlan0) and ethernet (eth0). I use wlan0 to access internet (static IP, networking is configured using netcfg), and I connect a second PC to the eth0. Now, whenever I start vmware player (v. 4.0.4), it chooses wlan0 to connect its bridged virtual NIC to, but I need it to connect to eth0 (I want my guest machine to be able to talk to the second physical PC on eth0). So, I disable the wlan0 interface (netcfg -d wireless) and restart vmware. Now, it connects to eth0, and everything works fine; I can ping the host PC from the virtual one, and I can ping the virtual PC from the second physical PC connected to eth0. Then, if I try to reenable the wlan0 interface (netcfg -u wireless), all of the connectivity between the host and the guest (and between the second physical PC and the guest) gets lost, until I disable wlan0 again. Can someone please give me a hint on what's going on?

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• Geek Bike Ride Sao Paulo

  - by Tori Wieldt

  What do you do on sunny Saturday in Sao Paulo when you have several Java enthusiasts, street lanes closed off for bicyclists, new cool Duke jerseys, and some wonderful bike angels to provide a tour through the city? A GEEK BIKE RIDE, of course! The weekend before JavaOne Latin America, the Sao Paulo geek bike ride was held today. We had 20+ riders and a wonderful route that took us from the Bicycle Park to and through downtown. It was a 30Km ride, but our hosts were kind enough to give riders the option to take the subway for part of the trip. Thanks to our wonderful bike angels, the usual rental bike problems like rubbing brakes, dropped chains, and even a flat tire were handled with ease.  The geek bike ride wasn't just for out-of-towners. Loiane Groner, who lives in Sao Paulo said, "I love the Geek Bike Ride! The last time I was in these parts of the city, I think I was five years-old!" A good time was had by all. (My only crash of the day was riding up an escalator with my bike. Luckily, the bikers with me were so busy helping me that no pictures were taken. <phew>) Enjoy this video by Hugo Lavalle You can also view Hugo's pictures. More pictures to come on Stephen Chin's blog.  So, what city is up next?  

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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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• How should I work out VAT (UK tax) in my eCommerce site?

  - by Leonard Challis

  We have an ecommerce system in place. The sales actually go through Sage, so we have an export script from our system that uses a third-party Sage Importer program. With a new version of this importer, values are checked more thoroughly. We are getting 1 pence discrepancies because of the way rounding works - our system has always held prices and worked to 4 decimal places. In the checkout the totals would be worked out first, then the rounding to 2 decimal places. The importer does rounding first, though. So, for instance: Our way: Product 1: £13.4561 Qty: 2 Total inc VAT = £32.29 (to 2dp) Importer way: Our way: Product 1: £13.4561 Qty: 2 Total inc VAT = £32.30 (to 2dp) Management are reluctant to lose the 4dp but the developers of the Sage importer have said that this is correct and makes sense -- you woudn't sell a product for £13.4561 in a shop, nor would you charge someone tax at 4 decimal places. I contacted the HMRC and the operator didn't really give me much to go on, telling me a technician would phone back, to which they haven't and I'm still waiting after almost a week and numerous follow-up calls. I did find a PDF on the HMRC's web site, but this did about us much to confuse me as it did to answer my questions. I see that they're happy for people to round up or down, as long it is consistent, but I can't tell whether it should be done on a line by line basis or on the end total of the order. We are now in the position where we need to decide whether it's worth us doing one of the following, or something completely different. Please advise with any experience or information I can read. Change all products on the site to use 2dp Keep 4dp but round each line in the order to 2dp before working out tax Keep it as it is and "fudge" the values at the export script (i.e. make that values correct by adding or subtracting 1p and changing the shipping cost to make the totals still work out) Any thoughts?

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• What could be my path? Networking, programming, or something else?

  - by momong

  Well first and foremost, I would like to give my brief description: I was an aviation student but I didn't pursue that path because I lost my interest. Now I'm an I.T. student and currently stopped schooling because of confusion. I don't know which path I should choose: could it be programming or networking? Someone told me that on networking the money is easy, the job is easy. Others told me that programming is best suited for me because I'm very skilled and excellent at figures. I want to chose networking, but I can't find my passion for it, my mind tells me but my heart doesn't... and on programming, I don't know which language I should pick or if I like it or not. A good mentor, even if only online, would be a very big plus to me, but I don't think if there are many who could spent their time on teaching a nobody... but I'm very eager to learn. My real passion is gaming! I want to work in the gaming industry, I want to be a man behind those games! I've been a gamer freak since birth. But I don't know how to get in to that industry. I don't know what to do. I don't know which path would really suit me. Sorry if some of you find this a pointless question, but please bear with me, this could be the turn of my life.

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• Current Technologies

  - by Charles Cline

  I currently work at the University of Kansas (KU) and before that Stanford University, to be particular the Stanford Linear Accelerator Center (SLAC).  Collaborating with various Higher Ed institutions the past several years has shown a marked increase in the Microsoft side of the house.  To give you an idea of our current environment, here are some of the things we (Enterprise Systems) have been working on the past two years I’ve been at KU: Migrated from Novell to Active Directory (AD), although we’re still leveraging Novell for IDM.  We currently have 550,000+ objects in AD, and we still have several departments to bring in. Upgraded from Exchange 2003 to Exchange 2010 and Forefront Online Protection for Exchange (FOPE) Implemented SCCM 2007 for Windows systems management Implemented central file storage using EMC products for the backend, using CIFS as the frontend Restructuring AD domains and Forests to decrease the administrative overhead and provide a primary authentication mechanism for the entire University Determining Key Performance Indicators for AD and Exchange Implemented SCOM 2007 to monitor AD and Exchange Implemented Confluence for collaboration within IT and other technology providers at the University Implemented Data Protection Manager (DPM) for backup of AD and Exchange Built a test and QA environment to better facilitate upcoming changes to the environment Almost ready to raise the AD domain level to 2008 R2   I’m sure I’m missing things, and my next post will be some of the things we’re getting ready for – like Centrify to provide AD for OS X and Linux systems.  If anyone would like more info on a particular area, please drop me a line.  I’d be happy to discuss.

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• Tomato QoS: Why is some traffic unclassified when there are classifications for it?

  - by Armitage

  Ok, I am trying to tweak my router to give priority to some traffic. My classifications seem to cover just about everything but I still see ~60 to ~80% of the traffic as unclassified: TCP 192.168.1.100 64137 192.168.1.1 80 Unclassified TCP 192.168.1.100 64175 192.168.1.1 80 Unclassified TCP 192.168.1.100 64144 192.168.1.1 443 Unclassified I assume that the 64### ports are just what my WAP uses to send packets inside my home network. But my classifications seems to cover any traffic for destination ports 80 and 443: (partial list) TCP Dst Port: 80,443 High WWW TCP/UDP Dst Port: 1024-65535 Lowest Bulk Traffic Why do I have so much unclassified traffic if I have a classification that should cover it?

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• Cannot re-install Ubuntu 12.04 via USB (USB booting issue)

  - by Mohd Arafat Hossain

  I've read the previous questions related to my same problem regarding the USB not booting issue and have tried everything from what was replied in those post's but still no luck. I will tell you everything I have done so far (If it helps in any way...) 1) Previously I had Windows 7 running on my laptop, where I downloaded the official torrent ISO (i386 desktop) and using Unetbootin I made a bootable USB 2) Restarted the laptop with the USB connected and IT BOOTED, then I installed it on my HDD(Internal) replacing my Windows 7 3) After installing it restarted and I took some time to explore Ubuntu after the log in, then went online and followed some website for the things to do after installing Ubuntu 12.04.....and then there were errors while installing some softwares and plug-ins. The error asked me to check if i was connected to the Internet properly....while I was surfing facebook good as always on an open Firefox. The same error comes when installing Ubuntu one. 4) so I decided to re-install Ubuntu thinking I had done something wrong during the installation (I'm installing from the same USB)...and it didn't boot. I checked the boot priority and it was/is set in USB first (as always). To say in detail what happens is when I restart the USB light flashes at start, later on stops and in the screen the installed Ubuntu 12.04 loads up for me to log in (meaning it's not booting from the USB). By reading you can see that I haven't done much and I honestly didn't even touch the system settings to mess things up. As I have mentioned above I've tried everything in the previous post's in this related topic and it didn't work so I'm hoping for a new solution as a reply. Thanks in advance :) Edited: I wanted to add this I want to clean install instead of solving errors so please give a step by step guide. thanks for any help :)

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• Medion Akoya E5211 won't boot up or go into BIOS

  - by jay

  My Medion Akoya kept getting a blue screen and shutting down. Now when I try and restart the laptop, I just get a blank screen with a flashing _ in the top left corner. It doesnt beep when turned on – only if I press buttons. It doesn't give me the option to start BIOS or set up. I have tried pressing F8, F12, F2 and F3 but still nothing happens. It just goes to the the black screen with the flashing _ It is running Windows Visa Home Basic.

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• Rails/Node.js interaction

  - by lpvn

  I and my co-worker are developing a web application with rails and node.js and we can't reach a consensus regarding a particular architectural decision. Our setup is basically a rails server working with node.js and redis, when a client makes a http request to our rails API in some cases our rails application posts the response to a redis database and then node.js transmits the response via websocket. Our disagreement occurs in the following point: my co-worker thinks that using node.js to send data to clients is somewhat business logic and should be inside the model, so in the first code he wrote he used commands of broadcast in callbacks and other places of the model, he's convinced that the models are the best place for the interaction between rails and node. I on the other hand think that using node.js belongs to the runtime realm, my take is that the broadcast commands and other node.js interactions should be in the controller and should only be used in a model if passed through a well defined interface, just like the situation when a model needs to access the current user of a session. At this point we're tired of arguing over this same thing and our discussion consists in us repeating to ourselves our same opinions over and over. Could anyone, preferably with experience in the same setup, give us an unambiguous response saying which solution is more adequate and why it is?

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• Track IP Messenger's chatting by wireshark

  - by Kumar P

  We have Linux server ( RHEL 5 ), and some client machines ( Windows XP ) in local area network. We using server as proxy server. I am using squid proxy. My windows machines using internet by proxy. Now my client machines using IP messenger for chatting and sharing files with in local network. How can i trace what they are doing or chatting by ip messenger, from my server by wireshark packet sniffer ? If i can't do it by wireshark , What will you give idea about it...

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• Exam 70-630 - TS: Microsoft Office SharePoint Server 2007, Configuring

  - by DigiMortal

  It has been really quiet here but I wasted no time. I passed exam 70-630 - TS: Microsoft Office SharePoint Server 2007, Configuring and in this posting I will give you a short overview of this very-very easy exam exam. If you are not new to SharePoint Server 2007 and you have some development experiences then this is the easiest exam from Microsoft you have ever seen. There are 51 questions in this exam and two or four of them were not familiar to me. I took me about one hour to prepare for this exam and I got 964 of 1000. Okay, I have some years of experience as SharePoint developer but these questions seemed still too easy for me to be real. I mean based on this exam you cannot accurately say if somebody is able to configure SharePoint Server or not. I think this exam should be very easy also to SharePoint Server administrators who have at least some experience with supporting and maintaining production systems running on SharePoint Server 2007. Those who does not feel strong on SharePoint Server configuring my read a book suggested by Microsoft Learning site: Inside Microsoft® Office SharePoint® Server 2007. Exam 70-630 gives you Microsoft Certified Technology Specialist certificate

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• Continuous Integration using Docker

  - by Leon Mergen

  One of the main advantages of Docker is the isolated environment it brings, and I want to leverage that advantage in my continuous integration workflow. A "normal" CI workflow goes something like this: Poll repository for changes Pull from repository Install dependencies Run tests In a Dockerized workflow, it would be something like this: Poll repository for changes Pull from repository Build docker image Run docker image as container Run tests Kill docker container My problem is with the "run tests" step: since Docker is an isolated environment, intuitively I would like to treat it as one; this means the preferred method of communication are sockets. However, this only works well in certain situations (a webapp, for example). When testing different kind of services (for example, a background service that only communicated with a database), a different approach would be required. What is the best way to approach this problem? Is it a problem with my application's design, and should I design it in a more TDD, service-oriented way that always listens on some socket? Or should I just give up on isolation, and do something like this: Poll repository for changes Pull from repository Build docker image Run docker image as container Open SSH session into container Run tests Kill docker container SSH'ing into the container seems like an ugly solution to me, since it requires deep knowledge of the contents of the container, and thus break the isolation. I would love to hear SO's different approaches to this problem.

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• Is my current employer expecting too much?

  - by priyank patel

  This is my first job as a programmer.I am working on ASP.NET/C#,HTML,CSS,Javascript/Jquery. I am working for a firm which develops software for small banking firms. Currently they have their software running in 100 firms.Their software is developed in Visual Fox Pro. I was hired to develop online version of this software.I am the solo developer. My boss is another developer.So my company has two developers. My boss doesnot have any idea about .NET development.I am working on their project since 8 months.The progress is surely there but not very big. I try my best to do what my boss asks.But the project just seems too ambitious for me. The company doesnot have any planning for the project.They just ask me to develop what their older software provides.So I have to deal with front end , back end,review codes , design architecture and etc. I have decided to give my best.I try a lot.But the project sometimes just seems to be overwhelming. So my questions is , is it normal for a programmer to be in this place. I always feel the need to work in atleast a small team if not big one. Are my employers just expecting too much of a fresher.Or is that I being a programmer am lacking the skills to deal with this. I am just not able judge my condition.Also I am paid very low salary.I do work on saturday as well. Can anyone just help me judge this scenario? Any suggestions are welcome.

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• How do I configure networking when using XEN on 12.04 Server

  - by Ingram

  I'm following this guide, https://help.ubuntu.com/community/XenProposed, and I'd like to setup a static IP address, but I don't know how. I'm using 12.04 Server. This is the step I'm having trouble at (I'm using eth1): Edit /etc/network/interfaces, and make it look like this: auto lo iface lo inet loopback auto xenbr0 iface xenbr0 inet dhcp bridge_ports eth0 auto eth0 iface eth0 inet manual I do this, and here is my output from ifconfig: eth1 Link encap:Ethernet HWaddr 00:17:a4:f8:79:20 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:478264 errors:0 dropped:0 overruns:0 frame:0 TX packets:2895 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:46470058 (46.4 MB) TX bytes:214620 (214.6 KB) Interrupt:17 Memory:fa000000-fa012800 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) xenbr0 Link encap:Ethernet HWaddr 00:17:a4:f8:79:20 inet addr:192.168.1.122 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::217:a4ff:fef8:7920/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:471842 errors:0 dropped:0 overruns:0 frame:0 TX packets:2795 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:37005780 (37.0 MB) TX bytes:182010 (182.0 KB) So how do I give this system a static IP address? Sorry, I'm not that familiar with networking on Ubuntu.

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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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