Re: can someone explain the concept of strings (or whatever) being immutable
Hi Deb, Immutability means that once This is a string is created in memory , the string cannot be changed. When we assign a_string with A different string this A different string is in a new memory location again (a new object) . This is a string and A different string are two different objects which are in existence which have been assigned to the variable a_string at different points in time. Now if This is a string is no longer referenced in the scope of the program , the reference count drops to zero at which point it is taken out of memory. Even though we perform a string concatenation and change the string from A different string to A different string appended with some more words , a new object is created , the initial string A different string is copied to this newly created object, appended with some more words are added to arrive at the final A different string appended with some more words. The original A different string still remains until the point wherein it is not longer referenced after which it is cleaned up. Thanks. On Tue, Jun 3, 2014 at 10:36 AM, Deb Wyatt codemon...@inbox.com wrote: -Original Message- From: b...@benfinney.id.au Sent: Tue, 03 Jun 2014 14:54:01 +1000 To: python-list@python.org Subject: Re: can someone explain the concept of strings (or whatever) being immutable Deb Wyatt codemon...@inbox.com writes: [no text] Deb, can you expand a bit – and write the question in the body of your message? It's not clear what you want explained. -- \ “I hope if dogs ever take over the world, and they chose a | `\king, they don't just go by size, because I bet there are some | _o__) Chihuahuas with some good ideas.” —Jack Handey | Ben Finney -- https://mail.python.org/mailman/listinfo/python-list that's strange that you see no text. The body of my email was as follows: a_string = This is a string a_string is pointing to the above string now I change the value of a_string a_string = This string is different I understand that now a_string is pointing to a different string than it was before, in a different location. my question is what happens to the original string?? Is it still in memory somewhere, nameless? That was just the first question. What does immutable really mean if you can add items to a list? and concatenate strings? I don't understand enough to even ask a comprehensible question, I guess. Thanks in advance, Deb in WA, USA FREE 3D EARTH SCREENSAVER - Watch the Earth right on your desktop! Check it out at http://www.inbox.com/earth -- https://mail.python.org/mailman/listinfo/python-list -- *HAVE A NICE DAY * Prashanth -- https://mail.python.org/mailman/listinfo/python-list
Re: IDE for python
Hi Sameer, Try pycharm, ninja ide, wings ide .. These are light and will help you to get started. Later on you can switch to vim which has many plugins for python. Also feel free to take a look at this link on stackoverflow comparing different features . http://stackoverflow.com/questions/81584/what-ide-to-use-for-python Thanks. On Wed, May 28, 2014 at 5:01 PM, Sameer Rathoud sameer.rath...@gmail.comwrote: On Wednesday, May 28, 2014 4:21:22 PM UTC+5:30, Mihamina Rakotomandimby wrote: On 05/28/2014 01:43 PM, Sameer Rathoud wrote: Please suggest, if we have any free ide for python development. I think major IDEs in the place have their Python integration. Did you make some search and tried each one? With just the information you provided, every existing IDE is OK. - What didnt you like in IDLE? - What IDE do you use for anything else thant Python? for C++ and C# development I prefer visual studio and for C++ try outs even codeblock is ok For Java I use eclipse. But first time I am trying python. I was trying some UI with python. I have installed wingide. But i didn't liked it because for licenses messages even in trial version. I was searching for spyder, but didn't got any helpful installable. -- https://mail.python.org/mailman/listinfo/python-list -- *HAVE A NICE DAY * Prashanth -- https://mail.python.org/mailman/listinfo/python-list
Re: python
Hi Karthik, Good that you have interest in switching to dev from admin stuff. Since you are already an admin , you wouldn't have problems with administrating an os (probabally weblogic deployment was on an ux/linux machine) or a database. The requirements that you see are a mix of different technologies for building a web application. But then Python and Javascript are the two major ones which you will have to focus on . Javascript is needed along with html and css for the front end alone . Most of the times the front end is only a consumer of the information from the backend except for the user interaction events where in information flows in the opposite way. The backend has the bussiness logic implemented and could be in any language here it is Python and of course this interacts with the database. So you could ignore the rest of the technologies for a while and learn Python till you become comfortable with - Maybe writing small sysadmin scripts or anything which may be of personal interest to you . There are several tutorials which others have pointed out .. May be you can take a look at http://swaroopch.com/notes/python/ (easy) or http://www.diveintopython.net/ (slightly deeper) . Once you get a hold, you could move on to Django which runs on top of Python to get a feel of webframeworks . This would be the time when you would need to lean javascript to make user interaction possible (JS is also a complete language in itself and would need some weeks to start with). The rest like mysql , html , css are something which you could learn when the need arises since you don't have to go too deep into these and that the basics are not too difficult to understand . Once you start working on web dev stuff you will have to know the design patterns further of with mvc is a part . This would definitely take some time and effort but it would be worth learning . Hope this helps :-) Thanks. On Thu, Feb 27, 2014 at 9:21 AM, Dennis Lee Bieber wlfr...@ix.netcom.comwrote: On Tue, 25 Feb 2014 17:27:19 -0800 (PST), Karthik Reddy challakart...@gmail.com declaimed the following: Thank you, but from by reaserch i got these requirements .. Python, django, Twisted, MySQL, PyQt, PySide, xPython. *Technical proficiency with Python and Django. Web application framework *Technical proficiency in JavaScript. Client-side web application *Experience with MySQL / PgSQL. Relational database -- unless you need to fully administer the DBMS or use direct/obscure commands, knowing generic SQL may be enough (note that Django will likely be using it's own ORM package so even SQL may not be needed) *Unix/Linux expertise. Well... that implies being fluent in the OS (probably at the shell scripting level). *Experience with MVC design patterns and solid algorithm skills. While I know the term, I've not had much experience with the application... Separation of the data (model) from the user interface (view) and the logic linking the two (controller). Algorithm is another matter (the word basically is equivalent to recipe). Core Python, DJango Framework, Web2Py, Google App engine, CherryPy ( Basic Introduction) The problem for me is whether i have to learn all these technologies to work as a python developer.. Django, Web2Py, GAE, CherryPy are all focused on /web-based/ (HTTP/HTML) applications. Python is just the implementation language. If the goal is just pure Python none of those may be applicable. For example, my most recent Python task was to generate UDP data packets to be fed through Cross Domain Solution boxes... I had to generate packets of various sizes, with some variation of contents [stuff that was supposed to trigger drop or edit actions in the CDS box]. Wireshark was used to capture the out-bound packets and the CDS-passed in-bound packets. Python was used to match the Wireshark captures to produce an SQLite database. Another Python program then extracted the latency data [outbound timestamp vs inbound timestamp] for the packets and create a CSV file for Excel plotting. That's three Python programs, yet none are web related. They required an understanding of the socket library, threading [the SQLite database relied on threads to read the two Wireshark capture files, filtering out all but the packet time-stamp and data ID string, and a third thread to match the out/in packets for latency -- and reporting any missing packets], and CSV library. Oh, and development of algorithms to do that processing. -- Wulfraed Dennis Lee Bieber AF6VN wlfr...@ix.netcom.comHTTP://wlfraed.home.netcom.com/ -- https://mail.python.org/mailman/listinfo/python-list -- *HAVE A NICE DAY * Prashanth -- https://mail.python.org/mailman/listinfo/python-list
Re: Beginner's guide to Python
Hi Steve , These links might be of help . http://swaroopch.com/notes/python/ -- Very well explained for beginners http://www.diveintopython.net/ -- Must read to pick up advanced stuff . This can also be used as a starting point to figure out what python might be used for . Hope this works for you . Thanks. On Wed, Sep 4, 2013 at 10:56 AM, Steve Hayes hayes...@telkomsa.net wrote: Can anyone recommend a web site that gives a good beginner's guide to Python? One that tells one, especially -- -- what kind of projects Python is good for -- what kind of projects it is not good for -- a simple explanation of how it works -- a kind of beginner's tutotial and guide to its syntax I've read about Python, and installed it on my computer when I found it on a DVD that came with a magazine, but I haven't got a clue about how to use it. So any advice on the best web sites for absolute novices would be welcome. -- Steve Hayes from Tshwane, South Africa Blog: http://khanya.wordpress.com E-mail - see web page, or parse: shayes at dunelm full stop org full stop uk -- https://mail.python.org/mailman/listinfo/python-list -- *HAVE A NICE DAY * Prashanth -- https://mail.python.org/mailman/listinfo/python-list
