🌐 Mailman 3 November 2013 - Tutor - python.org

Scripting Calligra sheets with Python
by Jim Byrnes Jan. 31, 2022

Jan. 31, 2022

I am trying to script Calligra Sheets (formerly KSpread) with python. I have gotten some of the included example scripts to run so I know python scripting is running. I found the following snippet on their website: import KSpread sheet = KSpread.view().sheet() # swap text of B5 and C6 t1 = sheet.text("B5") t2 = sheet.text(6,3) sheet.setText("B5", t2) sheet.setText(6, 3, t1) # swap value of D7 and E8 v1 = sheet.value("D7") v2 = sheet.value(8,5) sheet.setValue("D7", v2) sheet.setValue(8, 5, v1) Error: 'str' object has no attribute 'text' File "file:///usr/share/kde4/apps/sheets/scripts/extensions/myswap.py", line 4, in <module> This error message appeared in a dialog box. I've taught myself some Python but I don't understand what is happening here. Shouldn't t1 be a sheet object? What would cause it to be a str instead? Thanks, Jim

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HELP I need help with Python Setup or to reach Marilyn Davis
by carolynn fryer July 12, 2015

July 12, 2015

I am at the point where I am just spinning my wheels. I tried to get help with logging on but so far I am just getting frustrated. I have a problem that I brought up the first night in class but couldn't seem to get help then. Sorry if I am at the point where I am totally frustrated and I need HELP. PLEASE. I did not turn in homework because of the fact that I can not run anything without getting a syntax error. I tried setting up a path for python environment variables and a few other things but I am getting no where. Can you give me some suggestions why I can't run anything. I have windows 7 on my home computer, and windows 8 on my laptop and they are both doing the same thing. So it has to be something I am doing or not doing. I really do not like being behind/late in anything so that is making me even more frustrated. I suppose I am even more frustrated and afraid to ask because I kink of got a slap in the face last time I took a course here and the instructor would not help. But that was a way different situation, I simply could not understand his English and then he told me he did not have any patience. Excuse me but I just about died when he, an INSTRUCTOR told me that. I worked at Stanford for 25 years and to hear an instructor say those words was unthinkable. Anyway you can maybe understand my reluctance to ask for help but I need help. Any suggestions?? When I use one of the computers at school everything works just fine. Except I can not get my own computer to log on when I am there. So again that is why I said it is my system and something in my set up that I don't have. Sorry for the long note, I was just letting out a little frustration. LOL Thx for any suggestions, Carolynn Fryer ps: I know this is not the proper way to get ahold of you but I could not find nor have time to find any other way. The UCSC system is not very user friendly

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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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getUncPath(mappedDrive)
by Albert-Jan Roskam Jan. 31, 2014

Jan. 31, 2014

Hi, Is there a function that takes a file path with a mapped drive (z:\blah) and returns the associated UNC path (\\server\share\ding\dang\dong\blah)? I looked in os.path, but it doesn't seem to have this. The link below seems to be a solution (code in the bottom of the page), but I can't install win32com.client in the office :-( Is there any built-in function? http://stackoverflow.com/questions/2244767/python-check-network-map Thanks! Regards, Albert-Jan ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ All right, but apart from the sanitation, the medicine, education, wine, public order, irrigation, roads, a fresh water system, and public health, what have the Romans ever done for us? ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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empty delimiters, and None
by ugajin＠talktalk.net Dec. 1, 2013

Dec. 1, 2013

I run Inkscape (an Open Source vector drawing application) on OSX (Snow leopard) installed via .dmg pkg. The application ships with a collection of Python extensions, one of which Measure Path, failed to execute. I could not find a reference for this issue in the Inkscape archives, and I tried and worked with other workarounds including a javascript (outside Inkscape) to find the length of Bézier paths, but eventually I raised the issue and contacted launchpad/inkscape (question #239599) but to limited avail. After much continued searching I then found this Bug #803791 report which describes (as an aside) the exact same issue together with a solution. I know next to nothing about Python and I shall be glad if any Python guru can make clear (in layman's terms where possible) what the problem is/was and how the fix works. I remembered an alternative posting that I had read, which reported that Python dislikes empty delimiters. So I took a slightly different approach to the one mentioned in the above bug report. Instead of removing line 35 from the Measure Path script I replaced the empty delimiters with the Python constant None. To my great delight as well as my own amazement the 'fix' worked. The problem may or may not be limited to OSX. On trying to run the script (before the fix) I had the following traceback message: File "measure.py", line 35, in <module> locale.setlocale(locale.LC_ALL, '') File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/locale.py", line 494, in setlocale return _setlocale(category, locale) locale.Error: unsupported locale setting If I booted from the Unix file I received the following feedback: Setting Language: .UTF-8 (process:82224): Gtk-WARNING **: Locale not supported by C library. Using the fallback 'C' locale. Line 35 (above) shows the empty delimiter. The fix that I applied was to replace line 35 in the Measure.py script with: locale.setlocale(locale.LC_ALL, None). The Measure Path script then executes correctly. No other action is/was required. I note also the Python 2 library entry for Built-in Constants as: None The sole value of types.NoneType. None is frequently used to represent the absence of a value, as when default arguments are not passed to a function. Changed in version 2.4: Assignments to None are illegal and raise a SyntaxError. And under standard type hierarchy as: None This type has a single value. There is a single object with this value. This object is accessed through the built-in name None. It is used to signify the absence of a value in many situations, e.g., it is returned from functions that don’t explicitly return anything. Its truth value is false. I have run the various scripts in a Python Validator, and line 35 (both versions) pass unremarked, although there are a few other code errors and warnings and many pep8 warnings. I have also looked at locale.py Line 494 of which is the last line of a def (def function?) I include this below, hopefully this may save you searching for locale.py (Pyhon 2.6) should you need it and wish to answer the above questions, it may help. def setlocale(category, locale=None): """ Set the locale for the given category. The locale can be a string, a locale tuple (language code, encoding), or None. Locale tuples are converted to strings the locale aliasing engine. Locale strings are passed directly to the C lib. category may be given as one of the LC_* values. """ if locale and type(locale) is not type(""): # convert to string locale = normalize(_build_localename(locale)) return _setlocale(category, locale) Many, many thanks for your interest and considering matters. -A

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empty delimiters, and None
by ugajin＠talktalk.net Dec. 1, 2013

Dec. 1, 2013

Thanks for the helpful comments Eryksun/Steve Mis-configured environment (see below)? I rather felt that setting the 2nd parameter to None, was side stepping an underlying issue. However I experimented further and find; locale.setlocale(locale.LC_ALL, 'en_GB') also works OK. Perhaps this is a better fix than locale.setlocale(locale.LC_ALL, None) but again it may be side stepping the underlying issue. Here is link: https://answers.launchpad.net/inkscape/+question/239599. I think you need to register to access the both the question and Bug #803791 report. You may not want to do this. I believe the system locale is set correctly: Apples-iMac-4:~ apple$ locale LANG="en_GB.UTF-8" LC_COLLATE="en_GB.UTF-8" LC_CTYPE="en_GB.UTF-8" LC_MESSAGES="en_GB.UTF-8" LC_MONETARY="en_GB.UTF-8" LC_NUMERIC="en_GB.UTF-8" LC_TIME="en_GB.UTF-8" LC_ALL= The underlying problem appears to be with the application launcher script (see below). To explain 'booted from Unix file' is difficult for me, especially if you are unfamiliar with OSX, It is a way of running the application together with a Terminal window. Inkscape is an Open Source SVG editor with some 'proprietary' features that are not part of the SVG standard. The Measure Path script, can calculate either the length of, or the area enclosed by a path. The value is displayed as text, which is added and anchored to the path that is measured. Variables include precision (no. of significant places) and unit type (px, mm & etc.), as well as offset & font size (for text output). I did try contacting one of its authors, and I have raised the matter as a question, (see link above). The initial response was; "A workaround is to edit the launcher script (to force a valid UTF-8 language settings)." The fix provided (shown below) caused Inkscape to crash immediately after the launch routine completed: Quit all running instances of Inkscape. Then 1) Select Inkscape (the application) in the Finder 2) Choose 'Show Package Contents' from the context menu 3) Browse to 'Contents > Resources > bin' 4) Open the file 'inkscape' in a plain-text editor (e.g. TextWrangler) 5) Scroll down to line 127 6) Insert a new line before line 127 with this content: export LANG="en_US.UTF-8" 7) Save & close file (make sure that your text editor does _not_ add a hidden suffix to the file, else the application won't launch anymore) 8) Relaunch Inkscape If you prefer a different UI language, adjust the string "en_US.UTF-8" as needed. Lines 123 to 127 of the launcher script read: # NOTE: Have to add ".UTF-8" to the LANG since omitting causes Inkscape # to crash on startup in locale_from_utf8(). export LANG="`grep \"\`echo $LANGSTR\`_\" /usr/share/locale/locale.alias | \ tail -n1 | sed 's/\./ /' | awk '{print $2}'`.UTF-8" echo "Setting Language: $LANG" 1>&2 I am told this 'fix' works for OSX v10.5.8 (Leopard) and OSX 10.7.5 (Lion). However, I run OSX v10.6.8 (Snow Leopard). I am also interested in identifying the underlying issue, although I am far out of my comfort zone, and which seems to be with the launcher script. From the various postings and comments read, this seems to be something of an old chestnut. Maybe you can't suggest an alternative fix to the above, but maybe you can comment to help explain lines 123 - 127. Many many thanks, once more. -A

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strip and split?
by richard kappler Nov. 30, 2013

Nov. 30, 2013

I'm using psutil to generate some somatic data with the following script: import psutil as ps cpu = ps.cpu_percent() mem = ps.virtual_memory() disk = ps.disk_usage('/') All works well, but except for cpu I am struggling to learn how to strip out what I don't need. For example, once I do the above, if I then enter "disk" I get: disk usage(total=302264549376, used=73844322304, free=213066088448, percent=24.4) So if I want only the number following percent, I get that I need to convert this to a built in type and do some split and strip, but that's where I'm floundering. Might I get a little guidance on this please? regards, Richard -- *Mater tua criceta fuit, et pater tuo redoluit bacarum sambucus*

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Output not legible when debugging with ipdb
by Peter Zorn Nov. 30, 2013

Nov. 30, 2013

Hi everyone - I'm fairly new to Python and I'm working through this (<http://quant-econ.net/> ) tutorial to learn the language. I've encountered a problem with the ipdb debugger and I wonder if anyone can help. When I run this code (<http://quant-econ.net/ipython.html#setting-a-break-point> ) and include the "import ipdb; ipdb.set_trace()" command line, the ipdb debugger starts but its output is not legible (see debugging1.pdf in attach). In addition, after I ran the code, the layout of any other terminal output is also changed (see debugging2.pdf). I'm running Python(x,y) on Windows 7 64-bit in the Windows Powershell, but I've had the same problem with the Anaconda distribution of Python. Thanks, Peter

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Pretty printing XML using LXML on Python3
by SM Nov. 30, 2013

Nov. 30, 2013

Hello, I am using lxml with Python3, to generate xml code. "pretty_print" doesn't seem to indent the generated lines. I have installed the following lxml package: /usr/local/lib/python3.2/dist-packages/lxml-3.2.4-py3.2-linux-x86_64.egg/lxml The following is the example code I found on stack overflow, which runs fine on Python2.7. But it concatenates all the lines if I run the same code with Python3. Does anybody know what is the solution to make it work on Python3? from lxml import etree # create XML root = etree.Element('root') root.append(etree.Element('child')) # another child with text child = etree.Element('child') child.text = 'some text' root.append(child) # pretty string s = etree.tostring(root, pretty_print=True) print(s) Run with Python: $ python testx.py <root> <child/> <child>some text</child> </root> $ Run with Python3: $ python3 testx.py b'<root>\n <child/>\n <child>some text</child>\n</root>\n' $ Thanks in advance. -SM

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IndexError: list index out of range
by richard kappler Nov. 30, 2013

Nov. 30, 2013

I have a script that makes use of the Google speech recognition API as follows: import shlex print " say something" os.system('sox -r 16000 -t alsa default recording.flac silence 1 0.1 1% 1 1.5 1%') cmd='wget -q -U "Mozilla/5.0" --post-file recording.flac --header="Content-Type: audio/x-flac; rate=16000" -O - " http://www.google.com/speech-api/v1/recognize?lang=en-us&client=chromium"' args = shlex.split(cmd) output,error = subprocess.Popen(args,stdout = subprocess.PIPE, stderr= subprocess.PIPE).communicate() if not error: a = eval(output) #a = eval(open("data.txt").read()) confidence= a['hypotheses'][0]['confidence'] speech=a['hypotheses'][0]['utterance'] print "you said: ", speech, " with ",confidence,"confidence" When I run that script by itself, it works fine. When I insert the script into a larger program, I get the following error: ERROR: Traceback (most recent call last): File "inga.py", line 146, in <module> confidence= a['hypotheses'][0]['confidence'] IndexError: list index out of range If I understand it correctly, the traceback is telling me that there is no position [0] in my list, but I don't understand how that can be true. I'm not using the variable "confidence" anywhere else in the program. Here's the larger script/program into which the offending bits were inserted, up to the point of the error: #!/usr/bin/env python # -*- coding: utf-8 -*- import sys import aiml import commands import subprocess import marshal import datetime import os import os.path from os.path import exists ####################################################################### #################### read sensors ##################################### ####################################################################### ############ environmental ############ def environRead(): import serial from time import sleep sensors = dict.fromkeys('Sonar1 Sonar2 Sonar3 Sonar4 Dewpoint Temperature Humidity Light'.split()) arduino = serial.Serial('/dev/ttyACM0', 9600) sleep(1) line = arduino.readline().strip() line = line.lstrip('{').rstrip('}').strip() envSense = {} for item in line.split(','): item = item.strip() key, value = item.split(':') key = key.strip() value = value.strip() envSense[key]=int(value) return envSense ######## end environmental ####################### ########### somatic ############################## def somaticRead(): import psutil as ps cpu = ps.cpu_percent() mem = ps.virtual_memory() disk = ps.disk_usage('/') # need code to strip % out of disk, leaving just hdd = and some number # convert it all into a dictionary and return it ############ end somatic ########################## ####################################################################### ################ end sensor read ###################################### ####################################################################### ####################################################################### ############## facerec ################################################ ####################################################################### from SimpleCV import Camera import Image # initialize camera cam = Camera() #snap a picture using the camera img = cam.getImage() # find the face faces = img.findHaarFeatures('/usr/local/share/OpenCV/haarcascades/haarcascade_frontalface_alt.xml') if faces: for face in faces: face.draw() # crop at box around detected face cropped = face.crop() # save to file for processing im = cropped.copy() im.save("temp.png") # process image - grayscale and size im = Image.open("temp.png").convert("L") im = im.resize((125, 150), Image.ANTIALIAS) #delete the temp.png file # filelist = [ f for f in os.listdir(".") if f.endswith(".png") ] # for f in filelist: # os.remove(f) #save image for face recognizer im.save("match.png") subprocess.check_call(["python", "facerec", "match.png", "faceDbase", "18", "3"]) filelist = [ f for f in os.listdir(".") if f.endswith(".png") ] for f in filelist: os.remove(f) tmp = open("namefile.txt") name = tmp.read() #print("Hello " + name) greet = ("Hello " + name) print greet festivalCmd = '(SayText "%s")' % greet subprocess.Popen(['/usr/bin/festival', '-b', festivalCmd]) # need to add functions for not finding or not recognizing a face ############# return from a function #def get_face(arg): # some_variable = 10 * arg # return some_variable #result = get_face(5) ######################################################################## ############## end facerec ############################################# ######################################################################## ######################################################################## ############## sphinx speech rec will go here ########################## ######################################################################## ######################################################################## ####################### Google speech rec ############################## ######################################################################## import shlex print " say something" os.system('sox -r 16000 -t alsa default recording.flac silence 1 0.1 1% 1 1.5 1%') cmd='wget -q -U "Mozilla/5.0" --post-file recording.flac --header="Content-Type: audio/x-flac; rate=16000" -O - " http://www.google.com/speech-api/v1/recognize?lang=en-us&client=chromium"' args = shlex.split(cmd) output,error = subprocess.Popen(args,stdout = subprocess.PIPE, stderr= subprocess.PIPE).communicate() if not error: a = eval(output) #a = eval(open("data.txt").read()) confidence= a['hypotheses'][0]['confidence'] speech=a['hypotheses'][0]['utterance'] print "you said: ", speech, " with ",confidence,"confidence" ######################################################################## ################# end Google speech rec code ########################### ######################################################################## Any help would be greatly appreciated. regards, Richard -- *Mater tua criceta fuit, et pater tuo redoluit bacarum sambucus*

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