🌐 Mailman 3 February 2009 - Tutor - python.org

Wave module
by Alex Krycek Feb. 12, 2015

Feb. 12, 2015

Hello, I'm trying to join two .wav files with the wave module. But when I try to use wave.open(filename, "rb") I receive the following error: Traceback (most recent call last): File "<stdin>", line 1, in <module> File "F:\PortablePython1.0\lib\wave.py", line 483, in open return Wave_read(f) File "F:\PortablePython1.0\lib\wave.py", line 162, in __init__ self.initfp(f) File "F:\PortablePython1.0\lib\wave.py", line 143, in initfp self._read_fmt_chunk(chunk) File "F:\PortablePython1.0\lib\wave.py", line 264, in _read_fmt_chunk raise Error, 'unknown format: %r' % (wFormatTag,) wave.Error: unknown format: 85 I read somewhere that there are various wave formats, only some supported by Python. Is this true? If so, is there any way I can convert my wave files into a supported kind? Thanks!

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Send binary/hex data to a TCP socket
by Tod Haren July 19, 2011

July 19, 2011

I need to send a server at the other end of a socket a 36 byte "frame", where each byte represents a specific field in the custom data structure. (If there are any Ham operators reading this, I'm talking about the AGW Packet Engine) The documentation for the server says to initialize each field to a binary zero(0x00). How do I get a binary zero in Python? The next step is to send this all to the server and subsequently receive a similarly formated frame. A very basic frame looks something like this(modified from documentation): |00 00 00 00 4D 00 00 00 00 00 00 00 00 00 00 00 |....M........... |00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................ |00 00 00 00 |.... My problem is that hex(0) return '0x0' and hex(ord('M')) returns '0x4d'. If I concatonate these all together then the socket receives 109 bytes instead of 36. The documentation examples are in C++, so they are little help to me. The examples make use of the MoveMemory function for building the frames, but I'm clueless what that does. Pseudo code for the frame above: l = [] for i in xrange(36): l.append(hex(0)) l[4]=hex(ord('M')) d='' d=d.join(l) #I need some other data type to send besides a string! sock.send(d) #send the 36 bytes to the socket Any pointers or references would be greatly appreciated.

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cx_Oracle help
by Greg Lindstrom Jan. 6, 2011

Jan. 6, 2011

Hello, I'm trying to help out a friend and am stumped. Can you help me out? Thanks, --greg - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - I will briefly explain the problem I am facing. I am using Oracle 9.2, Python 2.5 and I installed cx_Oracle- 4.3.1-win32-9i-py25 in Python. From python I tried following : >>> import cx_Oracle >>> myDsn = cx_Oracle.makedsn('ISCN47',1521,'AUBDBS01') >>> CONN = cx_Oracle.connect(myusr, mypwd, myDsn) Traceback (most recent call last): File "<pyshell#4>", line 1, in <module> conn = cx_Oracle.Connection('scott','tiger',myDsn) RuntimeError: Unable to acquire Oracle environment handle I have set the below environment variables too NLS_LANG: <snip>.WE8MSWIN1252 ORACLE_HOME: D:\Tools\oracle\ora92 ORACLE_SID: AUBDBS01 PYTHON_HOME: d:\Utility\Python25 PYTHONPATH: %PYTHON_HOME%\lib;%PYTHON_HOME%\DLLs;%PYTHON_HOME%\Lib\site-packages;%ORACLE_HOME%\bin LD_LIBRARY_PATH: %LD_LIBRARY_PATH%;D:\Tools\oracle\ora92\lib Not getting any idea where I am wrong? Regards, Kishore

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Tracking time
by Michael Key Jan. 6, 2010

Jan. 6, 2010

I am trying to develop a project tracking program that would allow you to track hours and minutes spent on several different projects and store he data in a database for printing. Any help would be appreciated. Mike

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Learning Python
by Fred P Dec. 13, 2009

Dec. 13, 2009

Hey Everyone, I am completely new at python, but not new to programming or scripting. I have a couple of years of LUA scripting experience, about a year of C++ classes, and used to be very efficient at c-shell scripting in unix. My question for you guys: 1) How do I get Started? 2) Recommend any specific Books? 3) Any online tutors/ forums that would benefit a newbie 4) Any online classes that teach python? I have taken online c++ courses, and found them helpful. I was hoping to find something for python. My main objective is to write scripts for the following type of applications File management, file copies/syncs/ compares Text manipulation - like parsing text files to replace or augment specific values Integration into current applications to write redundant routines and maybe some day plugins I am not even sure what else, but I do know that every time i think of something that we need at work, other people say, "That would be a good task for a python script" and I would eventually like to be able to do something about that. Thanks Fred

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cx_oracle module problems
by jeremiah July 7, 2009

July 7, 2009

I've downloaded the cx_oracle source module for python, howerver every time i try to build it, it keeps on failing. I've been unable to find a port for Ubuntu. Is there one? Anyone know how to get this properly installed? # sudo python setup.py install Traceback (most recent call last): File "setup.py", line 36, in <module> oracleHome = os.environ["ORACLE_HOME"] File "/usr/lib/python2.5/UserDict.py", line 22, in __getitem__ raise KeyError(key) KeyError: 'ORACLE_HOME' Link: http://prdownloads.sourceforge.net/cx-oracle/cx_Oracle-4.2.tar.gz?download Thanks, JJ Disclaimer: The information contained in this transmission, including any attachments, may contain confidential information of Panasonic Avionics Corporation. This transmission is intended only for the use of the addressee(s) listed above. Unauthorized review, dissemination or other use of the information contained in this transmission is strictly prohibited. If you have received this transmission in error or have reason to believe you are not authorized to receive it, please notify the sender by return email and promptly delete the transmission.

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calling user defined function
by roberto March 15, 2009

March 15, 2009

hello i have a question which i didn't solved yet: i can define a function using the text editor provided by IDLE 3.0; then i'd like to call this function from the python prompt but when i try to do it, python warns me that function doesn't exist of course if i define the function directly using the >>> prompt, after that everything is fine may you tell me where i have to save the file that defines the function is order to use it later ? is it a problem of path ? my version of python is 3.0, OS windows xp thank you very much in advance -- roberto OS: GNU/Linux Debian Kubuntu, Edubuntu

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Add elements to list and display it [Very newbie question]
by Network Administrator March 2, 2009

March 2, 2009

I am beggining to learn Python and I appreciate if you help me with this: "I want a piece of a program to request the user to input "elements" (numbers, text, etc) and store them into a list. Then, I want to display all the elements one-per-line." I started using this code: #!/usr/bin/env python ##################### # This function fills any given list # and display its content. # x = 0 # Variable "x" initiallized to zero, just because Python required it while (x != 't2' ): # On user's input "t2", no more input must be required list = [] # I start a zero-elements list x = raw_input('Enter your number or text: ') # Software asks for user's input. list.append(x) # User's input is append to the list "list" for x in list: # It asks to enter the list and... print x # print their elements. Unfortunately, this code fails to do what I expect. I notice that user's input is not being append to the list, so, when I require to print the elements of the list only "t2" is displayed. I don't know how to append elements to a list on user's input. I appreciate your clearence. Regards, Will.

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Passing perimeters in dictionary values?
by nathan virgil March 1, 2009

March 1, 2009

I'm experimenting with OOP using the Critter Caretaker script from Python Programming for the Absolute Beginner as my basis. I've noticed that a dictionary/function combo is a great way to handle menus, and so I've adapted the menu to read as: selection = raw_input("Choice: ") choices = {"0":quit, "1":crit.talk, "2":crit.eat, "3":crit.play} choice = choices[selection] choice() so that I can call methods from a dictionary, instead of having an excruciatingly long if structure. Unfortunately, the problem I'm running into with this is that I can't pass any perimeters through the dictionary. I can't figure out how, for example, I could have an option that calls crit.eat(2) and another that calls crit.eat(4). The only thing I can think of is going back to the if structure, but my instinct tells me that this is a Bad Idea. What can I do?

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Auto Refresh
by Hi Feb. 28, 2009

Feb. 28, 2009

Thank you for the reply, SetLabel is exactly what I am looking for. And yes, you were correct, I just typoed the var_rate() when I was composing the email. So what I did is in my main GUI class: wx.StaticText(self, -1, sampling rate':', (107, 150)) self.rate_status = wx.StaticText(self, -1, '', (190, 150)) #just to initialize rate_status to some location def refresh(self, event): x = rate() rate_text = self.rate_status.SetLabel(str(x.rate_var())) and in my class that contains the variable (which will change every so often at the end, so right now I'm modeling this with a random generator): class rate(): def rate_var(self): samp_rate = random.randint(44100, 48000) return samp_rate I want to make it so once def refresh ran, it will continuously update and display the new value in samp_rate in my main GUI at some time interval, say every 10 seconds. I have looked up Timer, but I have not been able to make it work. I looked up the documentation in Python's website to no avail. Can anyone suggeste anything to help me? On Fri, Feb 27, 2009 at 5:05 PM, <tutor-request(a)python.org> wrote: > > Message: 7 > Date: Sat, 28 Feb 2009 01:00:21 -0000 > From: "Alan Gauld" <alan.gauld(a)btinternet.com> > Subject: Re: [Tutor] Auto Refresh > To: tutor(a)python.org > Message-ID: <goa2bk$kqn$1(a)ger.gmane.org> > Content-Type: text/plain; format=flowed; charset="iso-8859-1"; > reply-type=original > > > "Hi" <haztang17(a)gmail.com> wrote > > > > In my main GUI: > > > > def refresh(self, event): > > x = refresh_var() > > value = wx.StaticText(self, -1, str(x.var_rate)) > > Its not clear how you are positioning Static Text, I suspect you > need it as a opart of your main GUI and then reference it in > here and use the SetLabel() method to update its contents. > > But I also not that you are not calling the var_rate method of x. > Or does your code really look like > > value = wx.StaticText(self, -1, str(x.var_rate())) > > Notice the extra parens... > > > So each time I click on the button, which runs refresh, the new > > value > > generated by random.randint will be on top of the old number. Is > > there any > > commands I can use to remove the old value that is on the GUI window > > before > > I put the new one on there? > > I think you can just update the content of the original Text widget > using SetLabel() > > > -- > Alan G > Author of the Learn to Program web site > http://www.alan-g.me.uk/ > > End of Tutor Digest, Vol 60, Issue 143 > ************************************** >

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