Hi, Thank you very much Stefan Behnel for your reply.
I never thought you guys would go through my whole mail. Heck, no one bashed me about asking so many questions here (untill now)....no direct/indirect "Go away/dont ask such stupid questions etc etc" You people are amazingly patient and helpful. I am sure that there will be something in Python that will let me generate the hex stuff that I was talking about. I will spend more time learning this language. From what I understand, if something can be done in one scripting language, same can be done in any other, and definitely in Python. Thank you sir once again. On Mon, Nov 28, 2011 at 2:12 PM, <tutor-requ...@python.org> wrote: > Send Tutor mailing list submissions to > tutor@python.org > > To subscribe or unsubscribe via the World Wide Web, visit > http://mail.python.org/mailman/listinfo/tutor > or, via email, send a message with subject or body 'help' to > tutor-requ...@python.org > > You can reach the person managing the list at > tutor-ow...@python.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Tutor digest..." > > > Today's Topics: > > 1. Text Proccessing/Command Line Redirection/XML Parsing etc in > Python. (Pritesh Ugrankar) > 2. Re: Random order program (Charles Becker) > 3. Re: Text Proccessing/Command Line Redirection/XML Parsing etc > in Python. (Stefan Behnel) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Mon, 28 Nov 2011 13:26:06 +0530 > From: Pritesh Ugrankar <pritesh.ugran...@gmail.com> > To: tutor@python.org > Subject: [Tutor] Text Proccessing/Command Line Redirection/XML Parsing > etc in Python. > Message-ID: > <cafxxuzxtmspftbaat5zaz_3xscpvxxox7giqzzro2wyhgs8...@mail.gmail.com > > > Content-Type: text/plain; charset="iso-8859-1" > > First of all, my apologies for writing this very long post. > > I have been through some related questions about this in Stack Overflow as > well as googled it and found that Perl and Python are the two languages > that offer most what I need. As a SAN Administrator, I have a very limited > time to learn a scripting language so I can concentrate on only one. Most > of my questions below may make you think that I prefer Perl, but its > nothing like...Just that I tried learning Perl before for doing stuff I > want to try, but am thinking now what advantages will I have if I try out > Python? > > All my SAN Management Servers are Windows only. > > Following is what I am specifically looking at: > > 1) Consider the following output: > symdev -sid 1234 list devs > 0D62 Not Visible ???:? 07C:D13 RAID-5 N/A (DT) RW 187843 > 0D63 Not Visible ???:? 08C:C11 RAID-5 N/A (DT) RW 187843 > 0D64 Not Visible ???:? 07C:C12 RAID-5 N/A (DT) RW 62614 > 0D65 Not Visible ???:? 08C:D14 RAID-5 N/A (DT) RW 62614 > 0D66 Not Visible ???:? 07C:D15 RAID-5 N/A (DT) RW 31307 > 0D67 Not Visible ???:? 08C:C13 RAID-5 N/A (DT) RW 31307 > 0D68 Not Visible ???:? 07C:C14 RAID-5 N/A (DT) RW 31307 > > Whats given above is only a small part of the output. There are many other > fields that appear but I have left those out for brevity. > > The symdev commands generates a list of devices that can be used for SAN > Allocation. > > What I want to do is, on the Windows Machines, do something like a grep or > awk so that the 10th field, which contains the size of the devices will be > filtered and I can generate an output like. > > Devices of 187 GB = 3 > > Devices of 62 GB = 2 > > Devices of 31 GB = 3 > > Thing is, this output will differ on each storage box. Some may have 10 > devices, some may have 100.... > > I can use grep or awk for Windows, but looking at a bigger picture here. > > what I want to do is do some kind of filtering of the command line output > so that it will count the type of devices and seggregate them according to > their size. > > Tried Perl, but I found that the syntax was a little difficult to remember. > This is again my own shortcoming as I am not a trained programmer. I only > got to work on the script after a gap of many weeks and by that time, I > forgot what the script was supposed to do so had to start from the > scratch....May be commenting will help :) > > I could only get to a point where I was able to store the out put of the > whole line in an array but nothing beyond that because workload kept me > really busy. > > When I did that, each element of the array seem to have one line of the > output, like: The following was one element. > 0D62 Not Visible ???:? 07C:D13 RAID-5 N/A (DT) RW 187843 > > The following was the next element. > 0D63 Not Visible ???:? 08C:C11 RAID-5 N/A (DT) RW 187843 > > and so on..... > > What I wanted instead was a way to printout and count the last field.....I > guess I will have to use hashes in Perl. Most examples of Hashes I have > seen are pre created....But is there a way to create a Hash on the fly? > Because I dont know how many devices will be a part of that hash....it will > differ on each storage box....Is there something like this available in > Python that will let me filter/add/printout the last field in a way that it > will refer to it as a row and column kind of stuff? Is there a Hash > equivalent in Python? > > Note I am giving Perl examples because I started with Perl first....though > personally, I find Python syntax easier to understand...(Again, my > bad....my limitation...not of the language).. > > 2) Automate storage allocation. Whats given below is only a small part of > what I want to do.... Given is a brief output and explanation. > > All storage devices of my storage boxes have hexamdecimal LUN IDs..... > > Lets say I have a free available LUN IDs between say 5* to A .....meaning, > the command output looks something like this: > symcfg list -sid 1234 -sa 04B -p 0 -addresses -available > Symmetrix ID: 000184501234 > Director Device Name Attr Address > ---------------------- ----------------------------- ---- -------------- > Ident Symbolic Port Sym Physical VBUS TID LUN > ------ -------- ---- ---- ----------------------- ---- --- --- > FA-4B 04B 0 - AVAILABLE 0 0 000 * > 0029 /dev/rdsk/c1t0d1s2 0 0 001 > 0033 /dev/rdsk/c1t0d2s2 0 0 002 > 003D /dev/rdsk/c1t0d3s2 0 0 003 > 0046 Not Visible 0 0 004 > - AVAILABLE 0 0 005 * > 0075 Not Visible 0 0 00A > - AVAILABLE 0 0 00B * > > When there is a "*", from there on, till the next hex number, th LUN IDs > are available. Meaning, from 000* to 1, nothing is available, but from 005* > to 00A I have 006 through 009 available. I want to redirect this output to > an array or a hash or something like that, then filter the last field, and > then on the fly generate the LUN IDs between the 005 to 009 as well..Then > using some commands, automate the process of allocating the LUN IDs to some > free avaiable LUNs which I found in the first command output.... > > Is Perl better at manipulating hex or python? > > I know its possible to redirect the above output to a text file as well as > a CSV file or an XML File and do I/Os on those files and then .but is Perl > better for that or Python? > > 3) I want to generate reports on Performance, like which LUN has more > IOs....What will be helpful here is a language that can help me create > these graphs in excel....run the script and the output should generate a > graph in Excel.... > > Which language is better suited for my needs? I found Perl syntax a little > cryptic, but if Perl will be faster and better suited than Python, then I > am ready to invest more time with Perl.... > > Which language will be faster for text processing/automation? > > Which language will generate Binary executable that is smaller in size and > faster? > I played a little with Python too...today is my third day....Found the > syntax much easier to learn....Also came across cxfreeze which creates > independent binary executables...is something such available in Perl? > > 4) I also want to try out playing with XML output....The storage commands I > use allow me the output to be directed to an XML Format....Is Python better > suited at this ? > > Few more questions pop up like, Which will give me more freedom and ease to > maintain ? Which scripting language is better from the employability point > of view? > > I dont want to start with one language and six months or a year down think > "Heck, this was better in the other one".....because I really can > concentrate on only one langauge. > > My apologies in advance if any questions above seem to be dumb or naive. > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://mail.python.org/pipermail/tutor/attachments/20111128/ded43c3c/attachment-0001.html > > > > ------------------------------ > > Message: 2 > Date: Mon, 28 Nov 2011 00:57:10 -0700 > From: Charles Becker <charleshbec...@gmail.com> > To: "d...@davea.name" <d...@davea.name> > Cc: "tutor@python.org" <tutor@python.org>, myles broomes > <mylesbroo...@hotmail.co.uk> > Subject: Re: [Tutor] Random order program > Message-ID: <c59a2f2b-913b-47a4-b600-91692b4ad...@gmail.com> > Content-Type: text/plain; charset="us-ascii" > > Dave, Myles, et al, > > On Nov 27, 2011, at 4:25 PM, Dave Angel <d...@davea.name> wrote: > > > On 11/27/2011 05:17 PM, myles broomes wrote: > >> > >> > >> > >> > >> > >> > >> > >> #random order list > >> while len(random_word_list) != len(word_list): > >> word = random.choice(word_list) > >> if word not in random_word_list: > >> random_word_list += word > >> > > If you use += operator with list on the left side, it assumes something > compatible with list on the right. So either use > > random_word_list += [word] > > Or else use random_word_list.append(word) > >> > >> > >> > >> > >> > > Everyone has offered some good feedback, I just wanted to throw in this, > and hopefully everyone can say if I'm correct or not: > > A way to make the code more 'pythonic' and easier to read might be to > replace the conditional > while len(random_word_list) != len(word_list) > With the following : > For x in range(len(word_list)) > This will prevent infinite loops, easier to read, and allows for a lot of > other uses (even if x is never used). Any thoughts people? And would this > method (on a small or large scale) be 'cheaper' than the original > conditional? Or more 'pythonic'? > > Charles > > Sent from my iPhone > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://mail.python.org/pipermail/tutor/attachments/20111128/a1076e0e/attachment-0001.html > > > > ------------------------------ > > Message: 3 > Date: Mon, 28 Nov 2011 08:42:36 +0000 > From: Stefan Behnel <stefan...@behnel.de> > To: tutor@python.org > Subject: Re: [Tutor] Text Proccessing/Command Line Redirection/XML > Parsing etc in Python. > Message-ID: <javhht$llr$1...@dough.gmane.org> > Content-Type: text/plain; charset=UTF-8; format=flowed > > Pritesh Ugrankar, 28.11.2011 07:56: > > First of all, my apologies for writing this very long post. > > Welcome to the list. :) > > > > I have been through some related questions about this in Stack Overflow > as > > well as googled it and found that Perl and Python are the two languages > > that offer most what I need. As a SAN Administrator, I have a very > limited > > time to learn a scripting language so I can concentrate on only one. Most > > of my questions below may make you think that I prefer Perl, but its > > nothing like...Just that I tried learning Perl before for doing stuff I > > want to try, but am thinking now what advantages will I have if I try out > > Python? > > There are two anecdotes that people from both camps frequently report. With > Perl, people write their script, and then, several months later, they come > back, look at it, don't understand it anymore, and rewrite it. With Python, > people write their script, forget about it over time, write it again when > they need it, and when they happen to find the old one and compare it to > the new one, they find that both look almost identical. > > It's all in the syntax. > > > > All my SAN Management Servers are Windows only. > > > > Following is what I am specifically looking at: > > > > 1) Consider the following output: > > symdev -sid 1234 list devs > > 0D62 Not Visible ???:? 07C:D13 RAID-5 N/A (DT) RW 187843 > > 0D63 Not Visible ???:? 08C:C11 RAID-5 N/A (DT) RW 187843 > > 0D64 Not Visible ???:? 07C:C12 RAID-5 N/A (DT) RW 62614 > > 0D65 Not Visible ???:? 08C:D14 RAID-5 N/A (DT) RW 62614 > > 0D66 Not Visible ???:? 07C:D15 RAID-5 N/A (DT) RW 31307 > > 0D67 Not Visible ???:? 08C:C13 RAID-5 N/A (DT) RW 31307 > > 0D68 Not Visible ???:? 07C:C14 RAID-5 N/A (DT) RW 31307 > > > > Whats given above is only a small part of the output. There are many > other > > fields that appear but I have left those out for brevity. > > > > The symdev commands generates a list of devices that can be used for SAN > > Allocation. > > > > What I want to do is, on the Windows Machines, do something like a grep > or > > awk so that the 10th field, which contains the size of the devices will > be > > filtered and I can generate an output like. > > > > Devices of 187 GB = 3 > > > > Devices of 62 GB = 2 > > > > Devices of 31 GB = 3 > > > > Thing is, this output will differ on each storage box. Some may have 10 > > devices, some may have 100.... > > > > I can use grep or awk for Windows, but looking at a bigger picture here. > > > > what I want to do is do some kind of filtering of the command line output > > so that it will count the type of devices and seggregate them according > to > > their size. > > That's really easy. You open the file (see the open() function) and it > returns a file object. You can iterate over it with a for-loop, and it will > return each line as a string. Use the split() method on the string object > to split the string by whitespace. That returns a list of separate fields. > Then, pick the fields you want. In code: > > with open('thefile.txt') as f: > for line in f: > fields = line.split() > print(fields[9]) # the 10th field, for example > > If you are not reading the output from a file but from a process you > started, take a look at the subprocess module in the standard library. > > http://docs.python.org/library/subprocess.html > > Also take a look at string formatting for output. > > http://docs.python.org/tutorial/inputoutput.html > > http://docs.python.org/library/stdtypes.html#string-formatting-operations > > > > Tried Perl, but I found that the syntax was a little difficult to > remember. > > This is again my own shortcoming as I am not a trained programmer. I only > > got to work on the script after a gap of many weeks and by that time, I > > forgot what the script was supposed to do so had to start from the > > scratch....May be commenting will help :) > > Yep, that's Perl at it's best. > > > > Which language will generate Binary executable that is smaller in size > and > > faster? > > You usually don't do that. Instead, you'd install Python on all machines > where you need it and then just run your code there. > > If you really want to go through the hassle to build a self-contained > executable from each program you write, you will have to bundle the runtime > for either language with it, so it won't be small. > > > > 4) I also want to try out playing with XML output....The storage > commands I > > use allow me the output to be directed to an XML Format....Is Python > better > > suited at this ? > > Absolutely. Python has ElementTree. You'll just love working with it. > > http://docs.python.org/library/xml.etree.elementtree.html > > A quick tutorial is here: > > http://effbot.org/zone/element-index.htm > > > > Few more questions pop up like, Which will give me more freedom and ease > to > > maintain ? Which scripting language is better from the employability > point > > of view? > > > > I dont want to start with one language and six months or a year down > think > > "Heck, this was better in the other one".....because I really can > > concentrate on only one langauge. > > There are always certain types of problems that can be solved very > beautifully in a particular language. That's why there's more than one > language. You won't miss anything by choosing Python, though. > > Stefan > > > > ------------------------------ > > _______________________________________________ > Tutor maillist - Tutor@python.org > http://mail.python.org/mailman/listinfo/tutor > > > End of Tutor Digest, Vol 93, Issue 158 > ************************************** >
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