[Hampshire] Python sorting
If I have a dictionary in Python, where the keys are strings, and the values are instances of a class of mine, how can I get the list of keys sorted based on a property on my class? I can obviously do this manually, but was wondering if there was an inbuilt Python way of doing it more easily. As an example: Class MyClass: def __init__(self, prop) self.prop = prop def main(): test=dict() test["a"] = MyClass(46) test["b"] = MyClass(3) test["c"] = MyClass(15) # I would like to generate sortedTest=list() #containing b, c, a in that order. Thanks, Leo -- Please post to: Hampshire@mailman.lug.org.uk Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire LUG URL: http://www.hantslug.org.uk --
Re: [Hampshire] Python sorting
Hi Leo, You can do this fairly easily using the 'key' keyword argument for the 'sorted' function. Sorting a normal list can be done easily as: s = sorted(test) But if you want to tell it how to generate the value to sort on, you can use the key keyword, for example: s = sorted(test, key=str.lower) As you can see, the key parameter gives a function to be called on each of the elements before comparing them. In that case it uses a built-in Python function to convert each element to lowercase, but you can write your own function very easily to do what you want. You can do this by writing a normal function, like: def f(value): return value.prop and then calling it as follows: s = sorted(test.itervalues(), key=f) or by writing a lambda function, which is basically the same, but inline and without a name: s = sorted(test.itervalues(), key=lambda x: x.prop) I'm using test.itervalues() as the list to use here as that will just provide a list of the values in the dictionary, not the keys. Hope that helps, Cheers, Robin On 1 Sep 2012, at 15:53, Leo wrote: > If I have a dictionary in Python, where the keys are strings, and the values > are instances of a class of mine, how can I get the list of keys sorted based > on a property on my class? I can obviously do this manually, but was > wondering if there was an inbuilt Python way of doing it more easily. As an > example: > > Class MyClass: > def __init__(self, prop) > self.prop = prop > > def main(): > test=dict() > test["a"] = MyClass(46) > test["b"] = MyClass(3) > test["c"] = MyClass(15) > > # I would like to generate > sortedTest=list() > #containing b, c, a in that order. > > Thanks, > Leo > > > -- > Please post to: Hampshire@mailman.lug.org.uk > Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire > LUG URL: http://www.hantslug.org.uk > -- -- Please post to: Hampshire@mailman.lug.org.uk Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire LUG URL: http://www.hantslug.org.uk --
Re: [Hampshire] RDP from Debian to Windows 7 with dual monitors?
> > > Thanks for that Peter, I have installed VNC and will give it a try > tonight. I have the free version but thats OK as I am using the VPN to > handle encryption and basic password is fine as long as it's strong. > Just wanted to follow-up: VNC is the best solution so far. I get to see both desktops on the two remote monitors side-by-side on one large rectangle, where I can use a scrollbar to view the entire width. I enabled "scrolled window mode" and "grab all keyboard events" for best reulsts (otherwise ctrl-alt-delete to unlock Windows produces the "shutdown" dialog in Debian). I used Remmina to make the connection. RealVNC have a Linux client but not sure if that will give me any advantage. It's just shy of perfect though: I can also start another concurrent session and my thought was to have each session viewing each desktop. However in the second session, I can't interact with the remote side, the mouse pointer is "stuck" as a double-ended arrow. -- GPG Key fingerprint = B323 477E F6AB 4181 9C65 F637 BC5F 7FCC 9CC9 CC7F http://about.me/imranchaudhry -- Please post to: Hampshire@mailman.lug.org.uk Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire LUG URL: http://www.hantslug.org.uk --
[Hampshire] [JOB] Support Developer (Jobsite, Havant)
Come and join an online giant in the arena of digital recruitment! Jobsite (now called Evenbase) are looking for a Support Developer. You will be part of a small team making sure the Jobsite family of websites is maintained and running "business-as-usual". There are varied and interesting analysis and challenges involved. We use the renowned FogBugz case management tool and every developer has a powerful desktop with dual-widescreen monitors so we have excellent tools (we also have UltraEdit licences but you can use what you are most comfortable with). The desktop is Windows 7 and an Exchange environment but you can elect to use any flavour of Linux as long as you can self-admin. The team is part of a wider IT group of about 20 developers. Examples of some of the websites: http://www.jobsite.co.uk/ http://www.justengineers.net/ http://www.thisisderbyshire.co.uk/jobs We're mainly looking for someone with Perl but if you're proficient with another popular Web-language and can self-teach yourself Perl then we still want to hear from you. You need to have a good grasp of the elements of a modern website eg. templates, JavaScript/HTML/CSS, databases and SQL. You also need to have at least basic knowledge of the Linux command line, shell scripts and utilities like grep. This role not only calls upon good analysis and technical skills - you need to have a good "human" approach as you will be interacting with users and other developers. Good written and verbal English is essential. Having an appreciation of typical business functions and what goes on in them is also a plus. The offices are situated in Langstone Technology Park in Havant (about 5 miles east of Portsmouth). The facilities are excellent with a huge car park, on-site gym, coffee shop, resteraunt serving breakfast and lunch, free wi-fi, rest-area and even a table-tennis table. There is a large Tesco superstore nearby and Havant town centre has all the usual amenities. It's easily commutable by car being just off the M27/A27. Havant rail station is about 15 minutes walk. It is close to the coast and beautiful woodlands and there are ample lunchtime walks available. The company also allows working from home on occasion and we have a VPN access to workstations. If all that sounds like something that motivates you then please contact me direct if you are interested, thank you. (I am only interested in hearing from potential applicants, no agents please.) -- GPG Key fingerprint = B323 477E F6AB 4181 9C65 F637 BC5F 7FCC 9CC9 CC7F http://about.me/imranchaudhry -- Please post to: Hampshire@mailman.lug.org.uk Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire LUG URL: http://www.hantslug.org.uk --
[Hampshire] Surrey LUG Bring-a-box meeting: 8th September 2012, Sirius Corporation (Addlestone)
Hello. I am a little late with this but still in time! - the next Surrey LUG Bring-a-box meeting is scheduled for Saturday 8th September at the Sirius Corporation offices in Addlestone, from 11am to 5pm. (Note that the locations for September and October swapped - the meeting at RedHat in Farnborough will be in October.) There is a dedicated page for this month, where you can add details of talks, presentations, etc.: http://surrey.lug.org.uk/content/bab-september-2012 All offers of talks are gratefully received. It's often a good idea to put forward an idea of either a talk you can do or a subject you'd like to hear about on the mailing list or maybe even in the irc channel. Details of how to get there are at: http://surrey.lug.org.uk/Meetings/BringABox/Addlestone Do let the list know if you're going by car and able to offer lifts. Our thanks to Andrew Wilkins for hosting us this month. Look forward to seeing you there! robert_ -- Please post to: Hampshire@mailman.lug.org.uk Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire LUG URL: http://www.hantslug.org.uk --
Re: [Hampshire] [JOB] Support Developer (Jobsite, Havant)
On 01/09/2012 17:21, Imran Chaudhry wrote: Come and join an online giant in the arena of digital recruitment! It would help if you provided an estimated salary range. The offices are situated in Langstone Technology Park in Havant (about 5 miles east of Portsmouth). The facilities are excellent with a huge car park, on-site gym, coffee shop, resteraunt serving breakfast and lunch, free wi-fi, rest-area and even a table-tennis table. There is a large Tesco superstore nearby and Havant town centre has all the usual amenities. It's easily commutable by car being just off the M27/A27. Havant rail station is about 15 minutes walk. It is close to the coast and beautiful woodlands and there are ample lunchtime walks available. The company also allows working from home on occasion and we have a VPN access to workstations. Stil at the same place! I spent some time "on site" some years ago and I can say that the jobsite locale, people and work environ is a "good'un" :-) Jacqui -- Please post to: Hampshire@mailman.lug.org.uk Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire LUG URL: http://www.hantslug.org.uk --
Re: [Hampshire] Python sorting
Brilliant, thank you. I hadn't realised that Python could do lambda expressions as well, that's a bonus. Leo On 01/09/12 16:10, Robin Wilson wrote: Hi Leo, You can do this fairly easily using the 'key' keyword argument for the 'sorted' function. Sorting a normal list can be done easily as: s = sorted(test) But if you want to tell it how to generate the value to sort on, you can use the key keyword, for example: s = sorted(test, key=str.lower) As you can see, the key parameter gives a function to be called on each of the elements before comparing them. In that case it uses a built-in Python function to convert each element to lowercase, but you can write your own function very easily to do what you want. You can do this by writing a normal function, like: def f(value): return value.prop and then calling it as follows: s = sorted(test.itervalues(), key=f) or by writing a lambda function, which is basically the same, but inline and without a name: s = sorted(test.itervalues(), key=lambda x: x.prop) I'm using test.itervalues() as the list to use here as that will just provide a list of the values in the dictionary, not the keys. Hope that helps, Cheers, Robin On 1 Sep 2012, at 15:53, Leo wrote: If I have a dictionary in Python, where the keys are strings, and the values are instances of a class of mine, how can I get the list of keys sorted based on a property on my class? I can obviously do this manually, but was wondering if there was an inbuilt Python way of doing it more easily. As an example: Class MyClass: def __init__(self, prop) self.prop = prop def main(): test=dict() test["a"] = MyClass(46) test["b"] = MyClass(3) test["c"] = MyClass(15) # I would like to generate sortedTest=list() #containing b, c, a in that order. Thanks, Leo -- Please post to: Hampshire@mailman.lug.org.uk Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire LUG URL: http://www.hantslug.org.uk -- -- Please post to: Hampshire@mailman.lug.org.uk Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire LUG URL: http://www.hantslug.org.uk -- -- Please post to: Hampshire@mailman.lug.org.uk Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire LUG URL: http://www.hantslug.org.uk --
