Re: [Tutor] Help
On Fri, 14 May 2010 06:08:30 pm she haohao wrote:
> Say I have a .fa file and I want to print a subsequence from the file
> without the \n how can i do it.
>
> Example: Inside the test.fa file I have
>
> >chromosome 1
>
> ACTGTGTTC
> ACGTCGACC
> AVGTT
> ACGTTaGTC
>
> so if I say i wan the subsequence starting from the 7th character to
> the 11th(i.e when i let p=(7+11)/2=9 and v=2) character.(excluding
> the first line), mean I want TTCAC.
>
> So how should I write the code so that \n does not appear if i want
> p=10 and v=3.
text = open('test.fa', 'r').read() # includes newlines
text = text.replace('\n', '') # remove newlines
To get the characters 7 to 11 inclusive "TTCAC", you have to remember
that Python starts counting at 0, not 1, and the second position is
excluded. So you have to write:
text[6:11]
to get TTCAC.
--
Steven D'Aprano
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Re: [Tutor] [SOLVED] First steps for C++/Qt developers
Thanks Alan, On 15/05/2010 01:51 ص, Alan Gauld wrote: "M. Bashir Al-Noimi" wrote > Although, I personally am a bit biased towards: > http://www.cherrypy.org/ In simple words could you give me what's distinguished differences between cherrypy and django (I didn't stat with django cuz I'm still python principles)? They work a little differently and Django gives you lots of extra features that CherryPy doesn't - you need extra libraries to get the exta features. (Things like a templating engine and onject persistent database access. I'm also not sure how much of an admin GUI CherryPy delivers out of the box) In fact you can use TurboGears which is a direct competitor to Django and uses CherryPy as part of its framework. (Or it did - I know the latest version of TG has changed a lot!) One of the good and bad things about Python is that it supports many, many, different web tookits from the simplest CGI through to Zope and Plone which are enterprise class web frameworks(albeit with very different emphases). For most folks the middle ground includes things like Pylons, CherryPy and TG and Django. You can do most of what most people need with these and they are simpler in practice than either raw CGI or the heavyweight tools. So pick one and stick to it. Like languages or GUI toolkits, once you learn one moving to another is relatively painfree. Provided it does what you need and has a good support network don't stress over it! After reading many posts and articles I picked up Django because it fits my needs till now. Thanks once again for all. -- Best Regards Muhammad Bashir Al-Noimi My Blog: http://mbnoimi.net ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] application with tabs
Thanks for that info, Alan! It's pretty awesome to have support for a gui that looks native and is also included with Python by default. I'll check it out soon. On 5/14/10, Alan Gauld wrote: > > "Luke Paireepinart" wrote > >> well, but tkinter looks kinda crappy and non-native on almost every >> platform. > > Check out the new themed widgets in Tkinter for Python 2.7 and 3.1 > They use native platform widgets so don't just look like the native > interface they are the native interface... > > Hello world example here: > > http://www.testingreflections.com/node/view/8382 > > Module doc here > > http://docs.python.org/dev/library/ttk.html > > And the Tk tutorial with screenshots here: > > http://www.tkdocs.com/tutorial/onepage.html > > And a new TKGui builder that includes support for Python - I haven't tried > this > yet... > > http://puretkgui.sourceforge.net/ > > I'm hoping to add a page to my tutorial on the use of both Tix and ttk in > the new Python v3 version, if I ever get time to finish it! > > -- > Alan Gauld > Author of the Learn to Program web site > http://www.alan-g.me.uk/ > > > ___ > Tutor maillist - Tutor@python.org > To unsubscribe or change subscription options: > http://mail.python.org/mailman/listinfo/tutor > -- Sent from my mobile device ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] First steps for C++/Qt developers
"M. Bashir Al-Noimi" wrote > Although, I personally am a bit biased towards: > http://www.cherrypy.org/ In simple words could you give me what's distinguished differences between cherrypy and django (I didn't stat with django cuz I'm still python principles)? They work a little differently and Django gives you lots of extra features that CherryPy doesn't - you need extra libraries to get the exta features. (Things like a templating engine and onject persistent database access. I'm also not sure how much of an admin GUI CherryPy delivers out of the box) In fact you can use TurboGears which is a direct competitor to Django and uses CherryPy as part of its framework. (Or it did - I know the latest version of TG has changed a lot!) One of the good and bad things about Python is that it supports many, many, different web tookits from the simplest CGI through to Zope and Plone which are enterprise class web frameworks(albeit with very different emphases). For most folks the middle ground includes things like Pylons, CherryPy and TG and Django. You can do most of what most people need with these and they are simpler in practice than either raw CGI or the heavyweight tools. So pick one and stick to it. Like languages or GUI toolkits, once you learn one moving to another is relatively painfree. Provided it does what you need and has a good support network don't stress over it! HTH, Alan G. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] application with tabs
"Luke Paireepinart" wrote well, but tkinter looks kinda crappy and non-native on almost every platform. Check out the new themed widgets in Tkinter for Python 2.7 and 3.1 They use native platform widgets so don't just look like the native interface they are the native interface... Hello world example here: http://www.testingreflections.com/node/view/8382 Module doc here http://docs.python.org/dev/library/ttk.html And the Tk tutorial with screenshots here: http://www.tkdocs.com/tutorial/onepage.html And a new TKGui builder that includes support for Python - I haven't tried this yet... http://puretkgui.sourceforge.net/ I'm hoping to add a page to my tutorial on the use of both Tix and ttk in the new Python v3 version, if I ever get time to finish it! -- Alan Gauld Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] creating distribution lists in outlook
"Pirritano, Matthew" wrote It does seem like the python solution is going to be too labor intensive. As with many such issues I thought it would be a fun challenge to see if I could get it to work. : ) You probably could, but there is another way. Python does not have Outlook's limitations so, if you only need the distro lists for announcements - or even as a mail relay - you could use Python's native email libraries. Build a simple config/admin UI of your own and then use Python to send out messages - which could be text files. Or use Python (or indeed mailman or any other email list handler) as a relay so you send a mail to the relay and have it send the mail out to as many people as you want. That way you avoid Outlook's limits and all you need is an SMTP relay host. (You could even install sendmail or such to do that if you wanted) And all for free...apart from the cost of administering it of course... Alan G. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] application with tabs
On Fri, May 14, 2010 at 7:55 PM, Gary Koskenmaki wrote: > Hi, > > > My plan so far was to use tabs for the different functions of the > application such as entering data into the database, viewing data, and > running reports. I'm running into problems combining tabs with multiple > data fields and buttons. I can create multiple fields(text boxes) with > wxFrame and wxPanel, but when using wxNotebook to create tabs only the > last text box in each tab shows up. Say I have 3 text boxes, only the > third one shows up. If I comment it out the second one shows up. I > have a very similar problem with buttons. > I don't know how exactly you're doing it, but in general you'd create a wxPanel for each tab, place all your controls on it, and then use the notebook.addPage call to add the panel. > I have read and experimented with the examples on wxpywiki with no joy. > Using the following example from wxpywiki the text boxes created in the > TabPanel class are shown on every tab. When moving the text box > creation to the NotebookDemo class, so that I can have different > types/numbers of text boxes on each tab, I run into the problem of > having more than one text field displayed in each tab. > Right, that example pretty uses the approach I describe. The example does have three different tabs, they just all look the same because they are created from the same class. Please show us what exactly the code you're using that leads to the problem you describe. I suspect this is where things go wrong. Hugo ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] application with tabs
On Fri, May 14, 2010 at 12:55 PM, Gary Koskenmaki wrote:
> Hi,
>
> I'm new to any kind of application development, but have done some
> python scripting.
>
> What I'm doing is creating an application for a non-profit social
> services organization that will allow them to track the services they
> give their clients.
>
> My plan so far was to use tabs for the different functions of the
> application such as entering data into the database, viewing data, and
> running reports. I'm running into problems combining tabs with multiple
> data fields and buttons. I can create multiple fields(text boxes) with
> wxFrame and wxPanel, but when using wxNotebook to create tabs only the
> last text box in each tab shows up. Say I have 3 text boxes, only the
> third one shows up. If I comment it out the second one shows up. I
> have a very similar problem with buttons.
>
I have never used this tabbing before, but I'm guessing that you have
to catch the tab switching event and manually set the active panel
that the tab widget is displaying.
Something like (pseudocode)
panel1 = MyPanel()
panel2 = MyPanel2()
tabber = WxNotebook()
def myfunc(event):
if event.name == 'tab1':
tabber.set_active(panel1)
else:
tabber.set_active(panel2)
tabber.register_callback('tabswitch', myfunc)
That's purely a guess though.
>
> Am I going about creating this application interface in the most
> difficult way? Is there a better/easier way to create multiple
> application views in the same window? Can anyone recommend good books,
> tutorials, etc...?
>
Personally I like Qt more than WxWindows. In fact I like TK more as
well, but tkinter looks kinda crappy and non-native on almost every
platform.
There are lots of resources for Qt, and for pyQt specifically.
This is probably not the right place to ask this question though,
we're more for general Python questions. May be better to ask on a
wxpython list.
HTH,
-Luke
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Re: [Tutor] Help
On Fri, May 14, 2010 at 9:25 PM, Abhishek Mishra wrote:
>
linear1 = ''.join(foo.split('\n'))
linear2 = foo.replace('\n','')
> ^^ these are the two ways in which you can linearize the input text by
> removing all '\n'
+1 for the replace. More obvious, cleaner, more efficient.
Hugo
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Re: [Tutor] Help
Not sure if I understood the problem exactly, but you could linearize the
text by using something like this --
>>> foo = '''ACTGTGTTC
... ACGTCGACC
... AVGTT
... ACGTTaGTC'''
>>> foo
'ACTGTGTTC\nACGTCGACC\nAVGTT\nACGTTaGTC'
>>> linear1 = ''.join(foo.split('\n'))
>>> linear1
'ACTGTGTTCACGTCGACCAVGTTACGTTaGTC'
>>>
>>> linear2 = foo.replace('\n','')
>>> linear2
'ACTGTGTTCACGTCGACCAVGTTACGTTaGTC'
>>>
>>> linear1 = ''.join(foo.split('\n'))
>>> linear2 = foo.replace('\n','')
^^ these are the two ways in which you can linearize the input text by
removing all '\n'
after that you can grab 7th to 11th character like this -
>>> linear2[6:11]
'TTCAC'
^^ notice that the index is zero based, so 7th character actually 6 as its
index.
2010/5/14 she haohao
>
>
> Hi,
>
>
> I am a beginner in python and I have a problem here and I hope someone can
> help me.
>
> Your help is greatly appreciated.
>
> Question.
>
> Say I have a .fa file and I want to print a subsequence from the file
> without the \n how can i do it.
>
> Example: Inside the test.fa file I have
>
> >chromosome 1
> ACTGTGTTC
> ACGTCGACC
> AVGTT
> ACGTTaGTC
>
> so if I say i wan the subsequence starting from the 7th character to the
> 11th(i.e when i let p=(7+11)/2=9 and v=2) character.(excluding the first
> line), mean I want TTCAC.
>
> So how should I write the code so that \n does not appear if i want p=10
> and v=3.
>
> Thanks for the help.
>
> Have a wonderful day ahead!
> Angeline
>
>
> --
> Hotmail: Powerful Free email with security by Microsoft. Get it
> now.
>
> ___
> Tutor maillist - Tutor@python.org
> To unsubscribe or change subscription options:
> http://mail.python.org/mailman/listinfo/tutor
>
>
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[Tutor] Help
Hi, I am a beginner in python and I have a problem here and I hope someone can help me. Your help is greatly appreciated. Question. Say I have a .fa file and I want to print a subsequence from the file without the \n how can i do it. Example: Inside the test.fa file I have >chromosome 1 ACTGTGTTC ACGTCGACC AVGTT ACGTTaGTC so if I say i wan the subsequence starting from the 7th character to the 11th(i.e when i let p=(7+11)/2=9 and v=2) character.(excluding the first line), mean I want TTCAC. So how should I write the code so that \n does not appear if i want p=10 and v=3. Thanks for the help. Have a wonderful day ahead! Angeline _ Hotmail: Powerful Free email with security by Microsoft. https://signup.live.com/signup.aspx?id=60969___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] application with tabs
Hi, I'm new to any kind of application development, but have done some python scripting. What I'm doing is creating an application for a non-profit social services organization that will allow them to track the services they give their clients. My plan so far was to use tabs for the different functions of the application such as entering data into the database, viewing data, and running reports. I'm running into problems combining tabs with multiple data fields and buttons. I can create multiple fields(text boxes) with wxFrame and wxPanel, but when using wxNotebook to create tabs only the last text box in each tab shows up. Say I have 3 text boxes, only the third one shows up. If I comment it out the second one shows up. I have a very similar problem with buttons. I have read and experimented with the examples on wxpywiki with no joy. Using the following example from wxpywiki the text boxes created in the TabPanel class are shown on every tab. When moving the text box creation to the NotebookDemo class, so that I can have different types/numbers of text boxes on each tab, I run into the problem of having more than one text field displayed in each tab. The first code example is the one I'm using. http://wiki.wxpython.org/Notebooks Am I going about creating this application interface in the most difficult way? Is there a better/easier way to create multiple application views in the same window? Can anyone recommend good books, tutorials, etc...? I'm doing this on an i386 install of Debian and have python-wxgtk2.8 installed as well as libwxgtk2.8. The version of python itself is 2.5.5. All related packages are Debian packages. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] First steps for C++/Qt developers
Thanks Steve, On 14/05/2010 11:22 ص, steve wrote: Hello Bashir, On 05/13/2010 08:48 AM, M. Bashir Al-Noimi wrote: Thanks Alan, [...snip...] Oh my god, I finished the basics of python within one day (continues 10 hours)!!! What's amazing language :-* Yes, everyone here feels the same way :). Anyways, now that you have a hang of python and you already know Qt, I would recommend playing around with PyQT just to get a feel of the language using API that you already know. http://www.riverbankcomputing.co.uk/ http://www.commandprompt.com/community/pyqt/ Actually I wrote first PyQt application yesterday by using eric IDE, although it has stupid autocompleting and bad GUI but I could create Hello World app within 5 minutes, that's it. My adventure in python going smoothly and community of python has truly open minds. If you want to directly head on to learning Web Programming though, I suggest you start with: http://www.djangobook.com/en/2.0/ Although, I personally am a bit biased towards: http://www.cherrypy.org/ ...which is a lean, no-frills web application framework. In simple words could you give me what's distinguished differences between cherrypy and django (I didn't stat with django cuz I'm still python principles)? Like other have mentioned, you don't need to know CGI programming to write web applications these days, but knowing how CGI works helps immensely. For a high level overview of web programming using python, see: http://docs.python.org/howto/webservers.html hth, cheers, - steve -- Best Regards Muhammad Bashir Al-Noimi My Blog: http://mbnoimi.net ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] First steps for C++/Qt developers
Hello Bashir, On 05/13/2010 08:48 AM, M. Bashir Al-Noimi wrote: Thanks Alan, [...snip...] Oh my god, I finished the basics of python within one day (continues 10 hours)!!! What's amazing language :-* Yes, everyone here feels the same way :). Anyways, now that you have a hang of python and you already know Qt, I would recommend playing around with PyQT just to get a feel of the language using API that you already know. http://www.riverbankcomputing.co.uk/ http://www.commandprompt.com/community/pyqt/ If you want to directly head on to learning Web Programming though, I suggest you start with: http://www.djangobook.com/en/2.0/ Although, I personally am a bit biased towards: http://www.cherrypy.org/ ...which is a lean, no-frills web application framework. Like other have mentioned, you don't need to know CGI programming to write web applications these days, but knowing how CGI works helps immensely. For a high level overview of web programming using python, see: http://docs.python.org/howto/webservers.html hth, cheers, - steve -- random spiel: http://lonetwin.net/ what i'm stumbling into: http://lonetwin.stumbleupon.com/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Design Question: File Object used everywhere
On Fri, 14 May 2010 06:49:59 +0200 Jan Jansen wrote: > Hi there, > > I'm working on a code to read and write large amounts of binary data > according to a given specification. In the specification there are a lot > of "segments" defined. The segments in turn have defintions of datatypes > and what they represent, how many of some of the data values are present > in the file and sometimes the offset from the beginning of the file. > > Now I wonder, what would be a good way to model the code. > > Currently I have one class, that is the "FileReader". This class holds > the file object, information about the endianess and also a method to > read data (using the struct module). Then, I have more classes > representing the segements. In those classes I define data-formats, call > the read-method of the FileReader object and hold the data. Currently > I'm passing the FileReader object as arguement. > > Here some examples, first the "FileReader" class: > > class JTFile(): > > def __init__(self, file_obj): > self.file_stream = file_obj > self.version_string = "" > self.endian_format_prefix = "" > > def read_data(self, fmt, pos = None): > format_size = struct.calcsize(fmt) > if pos is not None: > self.file_stream.seek(pos) > return struct.unpack_from(self.endian_format_prefix + fmt, > self.file_stream.read(format_size)) Since JTFile (as name says) is mainly a file, you could subtype it from file, thus avoiding its file_stream attribute and replacing self.file_stream.read/seek with direct self.read/seek. Also, this better mirrors the model, I guess. > and here an example for a segment class that uses a FileReader instance > (file_stream): > > class LSGSegement(): > > def __init__(self, file_stream): > self.file_stream = file_stream > self.lsg_root_element = None > self._read_lsg_root() > > def _read_lsg_root(self): > fmt = "80Bi" > raw_data = self.file_stream.read_data(fmt) > self.lsg_root_element = LSGRootElement(raw_data[:79], raw_data[79]) > > So, now I wonder, what would be a good pythonic way to model the > FileReader class. Maybe use a global functions to avoid passing the > FileReader object around? Or something like "Singleton" I've heard about > but never used it? Or keept it like that? A singleton object is just a unique instance of a type. The singleton pattern simply ensures this unicity by refusing to create more instances. The python way, I guess, is rather a gentleman agreement, which in this case means creating a single instance and no more, since you are the only user of your file-reading service. If this were to be distributed as module, then document this "uncity" point, or implement the singleton pattern. (But I don't understand why there should be only one file-reader. Rather, there should be only one per (disk) file ;-) If you make the type a subtype of file, then this is certainly automatically ensured since no 2 python file objects can point to the same disk file -- I guess -- to be checked.) > Cheers, > > Jan Denis vit esse estrany ☣ spir.wikidot.com ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Design Question: File Object used everywhere
Jan Jansen wrote: Hi there, I'm working on a code to read and write large amounts of binary data according to a given specification. In the specification there are a lot of "segments" defined. The segments in turn have defintions of datatypes and what they represent, how many of some of the data values are present in the file and sometimes the offset from the beginning of the file. Now I wonder, what would be a good way to model the code. Currently I have one class, that is the "FileReader". This class holds the file object, information about the endianess and also a method to read data (using the struct module). Then, I have more classes representing the segements. In those classes I define data-formats, call the read-method of the FileReader object and hold the data. Currently I'm passing the FileReader object as arguement. Here some examples, first the "FileReader" class: class JTFile(): def __init__(self, file_obj): self.file_stream = file_obj self.version_string = "" self.endian_format_prefix = "" def read_data(self, fmt, pos = None): format_size = struct.calcsize(fmt) if pos is not None: self.file_stream.seek(pos) return struct.unpack_from(self.endian_format_prefix + fmt, self.file_stream.read(format_size)) and here an example for a segment class that uses a FileReader instance (file_stream): class LSGSegement(): def __init__(self, file_stream): self.file_stream = file_stream self.lsg_root_element = None self._read_lsg_root() def _read_lsg_root(self): fmt = "80Bi" raw_data = self.file_stream.read_data(fmt) self.lsg_root_element = LSGRootElement(raw_data[:79], raw_data[79]) So, now I wonder, what would be a good pythonic way to model the FileReader class. Maybe use a global functions to avoid passing the FileReader object around? Or something like "Singleton" I've heard about but never used it? Or keept it like that? Cheers, Jan I agree with Luke's advice, but would add some comments. As soon as you have a global (or a singleton) representing a file, you're making the explicit assumption that you'll never have two such files open. So what happens if you need to merge two such files? Start over? You need to continue to pass something representing the file (JTFile object) into each constructor. The real question is one of state, which isn't clear from your example. The file_stream attribute of an object of class JTFile has a file position, which you are implitly using. But you said some segments are at fixed positions in the file, and presumably some are serially related to other segments. Or perhaps some segments are really a section of the file containing smaller segments of different type(s). Similarly, each object, after being created, probably has relationship to other objects. Without knowing that, you can't design those object classes. Finally, you need to decide early on what to do about data validation. If the file happens to be busted, how are you going to notify the user. If you read it in an ad-hoc, random order, you'll have a very hard time informing the user anything useful about what's wrong with it, never mind recovering from it. It's really a problem in serialization, where you read a file by deserializing. Consider whether the file is going to be always small enough to support simply interpreting the entire stream into a tree of objects, and then dealing with them. Conceivably you can do that lazily, only deserializing objects as they are referenced. But the possibility of doing that depends highly on whether there is what amounts to a "directory" in the file, or whether each object's position is determined by the length of the previous one. In addition to deserializing in one pass, or lazily deserializing, consider deserializing with callbacks. In this approach you do not necessarily keep the intermediate objects, you just call a specified user routine, who should keep the objects if she cares about them, or process them or ignore them as needed. I've had to choose each of these approaches for different projects, and the choice depended in large part on the definition of the data file, and whether it could be randomly accessed. DaveA ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
