🌐 Mailman 3 February 2017 - 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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Desktop Notifications on Linux
by Dharmit Shah June 29, 2017

June 29, 2017

Hi all, I am trying to create a script that will go through the /var/log/secure file on a Linux system and provide desktop notifications for failed login attempts. Here is the code - http://pastebin.com/MXP8Yd91 And here's notification.py - http://pastebin.com/BhsSTP6H I am facing issue in the function "new_attempts_from_last". I am not able to raise a desktop notification from this function. It always fails with this traceback - http://pastebin.com/cgHMScv3 I see this error only when I try to raise a notification from the aforementioned function. If I run test examples under /usr/share/doc/notify-python/examples, it works just fine. Also, if I try to raise a notification from under if __name__ == "__main__":, it works without any issues. So I don't think there's any issue with OS's notification daemon. Running from python shell like below also works fine: In [1]: import notification In [2]: notification.notification("Hey") What am I missing or doing wrong here? If it matters, I am running Fedora 20, python 2.7 and Cinnamon desktop environment. For readability purposes, I have provided pastebin links. Let me know if this is not the correct way. Regards, Dharmit.

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Using venv
by Jim May 30, 2017

May 30, 2017

It has been suggested to me that I should use a virtual environment and venv would be a good choice. I've read through PEP405 and this link [1]. Though some of it seems a little confusing to me, I'm sure I can get it up and running. This question seems a little dumb and maybe I am being a little dense, but then what? Your program/script is done how do you run it? Do you always have to activate your venv and run it from there? I like to run Tkinter programs from a launcher. Would that be possible and what would the command look like? Lately I have been writing some Libreoffice calc macros and evaluating pyspread for it's macro capability. Would modules installed in my venv be available to the spreadsheet programs? Thanks, Jim [1] https://realpython.com/blog/python/python-virtual-environments-a-primer/

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feedback on simple python code
by Ryan Smith March 2, 2017

March 2, 2017

Hi all, New python student here. I have been using O¹reilly¹s "Python Beyond the Basics: Object Oriented Programming video series". In one of the assignments we are to write a simple inheritance hierarchy of three classes that write to text files. I have actually written the code for the assignment and it runs as well as meets the requirements of the assignment. I am posting to get feedback on how I can improve this and making it more pythonic and concise. Please keep in mind that I am simply ³simulating" writing to a log file and a tabbed delimited file, so I¹m not necessarily looking for which modules I could have to create actual log files or writing to actual csv files. The output of the code should be two text files with text written to them that have been passed to the instance of each respective object. #!/usr/bin/env python import abc import datetime class WriteFile(object): __metaclass__ = abc.ABCMeta @abc.abstractmethod def write(self,text): """Write to file""" return class LogFile(WriteFile): def __init__(self,fh): self.fh = fh def write(self, text): date = datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S') entry = "{0} {1}{2}".format(date, text, '\n') with open(self.fh, 'a') as f: f.write(entry) class DelimWrite(WriteFile): def __init__(self, fh, delim): self.fh = fh self.delim = delim def write(self, text): with open(self.fh, 'a') as f: entry = "" for item in text: if self.delim in item: entry += ' "{0}"{1} '.format(item,self.delim) else: entry += item+self.delim f.write(entry.strip(self.delim) + '\n') if __name__ == "__main__": log = LogFile('log.txt') log.write('This is a log message') log.write('This is another log message') d = DelimWrite('test.csv',',') d.write([1¹,¹2¹,¹3¹]) d.write(['a','this, that','c¹]) #Double quote item if delimiter included as list item d.write([basketball¹,'football¹,'golfball'])

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Learning Objectives?
by Leam Hall March 1, 2017

March 1, 2017

Is there a list of Python skill progression, like "Intermediates should know <this> and Advanced should know <this and that>?" Trying to map out a well rounded study list. Thanks! Leam

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pygrib issues involving wind
by Jason Snyder March 1, 2017

March 1, 2017

I have a grib2 file. You can see the components of this grib2 file below: wgrib2 -v chart_2017022812_0057.grb2 1:0:d=2017022812:RH Relative Humidity [%]:2 m above ground:57 hour fcst: 2:227081:d=2017022812:TMAX Maximum Temperature [K]:2 m above ground:54-57 hour max fcst: 3:486870:d=2017022812:UGRD U-Component of Wind [m/s]:10 m above ground:57 hour fcst: 4:751610:d=2017022812:VGRD V-Component of Wind [m/s]:10 m above ground:57 hour fcst: 5:1009523:d=2017022812:PRATE Precipitation Rate [kg/m^2/s]:surface:54-57 hour ave fcst: Now I am trying to use pygrib to extract the U and V wind components of this grib2 file with the below python script: grib = 'chart_2017022812_0057.grb2' grbs=pygrib.open(grib) uwind = grbs.select(name='U-component of wind')[0] rh = grbs.select(name='Relative humidity')[0] temp = grbs.select(name='Maximum temperature')[0] prate = grbs.select(name='Precipitation rate')[0] while with this script, I am able to successfully extract relative humidity, temperature, and precipitation rate, I am having a problem extracting the u component of wind. I get the error: Traceback (most recent call last): File "testgrib.py", line 16, in <module> uwind = grbs.select(name='U-Component of wind')[0] File "pygrib.pyx", line 609, in pygrib.open.select (pygrib.c:6175) ValueError: no matches found How can I resolve this issue?

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Help with this question
by Johnny Hh Feb. 28, 2017

Feb. 28, 2017

write a python function called find_most_freq() that returns the element of a given list that occurs the most frequently. If there are ties, take the number found first.

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Problem with Spyder IDE in Anaconda3
by Stephen P. Molnar Feb. 28, 2017

Feb. 28, 2017

I had sent the following message to Anaconda Support: I have just installed anaconda3-4.3.0 and upgraded Spyder to v-3.1.3. When I open Spyder and run a python script that has run perfectly in a previous version of Spyder I get the results that I expect,but with 'Kernel died, restarting' and I get a new iPython console prompt. Also a popup that asks 'Do you want to close this console?'. If I answer 'No' I get the following in the Internal Console: Spyder Internal Console This console is used to report application internal errors and to inspect Spyder internals with the following commands: spy.app, spy.window, dir(spy) Please don't use it to run your code >>> WARNING:traitlets:kernel restarted Traceback (most recent call last): File "/home/comp/Apps/anaconda3/lib/python3.6/site-packages/qtconsole/base_frontend_mixin.py", line 163, in _dispatch handler(msg) File "/home/comp/Apps/anaconda3/lib/python3.6/site-packages/spyder/widgets/ipythonconsole/namespacebrowser.py", line 192, in _handle_execute_reply super(NamepaceBrowserWidget, self)._handle_execute_reply(msg) File "/home/comp/Apps/anaconda3/lib/python3.6/site-packages/qtconsole/jupyter_widget.py", line 184, in _handle_execute_reply super(JupyterWidget, self)._handle_execute_reply(msg) File "/home/comp/Apps/anaconda3/lib/python3.6/site-packages/qtconsole/frontend_widget.py", line 492, in _handle_execute_reply self._request_info['execute'].pop(msg_id) KeyError: '50af986d-2e5c-4cef-aef4-827370619c86' Very strange, and most annoying. I received an answer: I know a solution for this problem. I guess you are using Kaspersky product. You need to add "python.exe", and "pythonw.exe" of Anaconda specific into Exclusions list and make them trusted applications. Where would I find such a list? There is no mention of such a list in the Debian Handbook and a Google search didn't find anything that I could see would apply to solution to this problem. Nothing I found about the Kaspersky product told me where (or how) to find an exclusion list. I'm hoping that kind sole on this list can help em solve this problem. Thanks in advance. -- Stephen P. Molnar, Ph.D. Life is a fuzzy set www.molecular-modeling.net Stochastic and multivariate (614)312-7528 (c) Skype: smolnar1

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[Python 2.7] HELP: Serving HTTP on 0.0.0.0 port 80 not proceeding
by Allan Tanaka Feb. 27, 2017

Feb. 27, 2017

Not completely sure why it doesn't open the chart on the web browser when i type this in the windows command prompt (cmd) python -m SimpleHTTPServer port 80.So first i type python ml.py data/sample.csv in cmd windows and then python -m SimpleHTTPServer port 80, but it's not proceeding to the graph in html?? See attached image for screenshoot and complete .py file

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Checkbuttons Variables PY_VAR
by Pooja Bhalode Feb. 27, 2017

Feb. 27, 2017

Hi, The following code creates a list of checkboxes (each associated with different variables) for the user to select from, after having selected the ones that user wants, I am trying to add the selected variables to another list so that the selected variables can be accessed later in the code. However, when I try appending to the new list, it gets appended as PY_VAR instead of the variable name associated. Can someone please let me know where I am going wrong. I would really appreciate it. Thank you Pooja Code given below: keqparam = IntVar() delHrxnparam = IntVar() kfparam = IntVar() Afparam = IntVar() ksimparam = IntVar() Aparam = IntVar() RAparam = IntVar() RCparam = IntVar() total_number_parameters = IntVar() selectedparam = [] checkboxVars = [keqparam, delHrxnparam, kfparam, Afparam, ksimparam, Aparam, RAparam, RCparam] def EstimateParameters(): print "EstimateParameters" paramroot = Toplevel(root) paramroot.title("Selection of Parameters to be estimated") def SelectAll(): for var in checkboxVars: var.set(1) def DeselectAll(): for var in checkboxVars: var.set(0) Button(paramroot, text = "Select all", command = SelectAll).grid(row = 0, column = 2, sticky = W) Button(paramroot, text = "Deselect all", command = DeselectAll).grid(row = 0, column = 3, sticky = W) Label(paramroot, text = "Select all the parameters to be estimated: ").grid(row = 0, column = 0, sticky = W) sticklabel = Label(paramroot, text = "1. Reversible reaction001") sticklabel.grid(row = 1, column = 0, sticky = W) Label(paramroot, text = u"\t A + B \u21cc D").grid(row = 3, column = 0, sticky = W) Checkbutton(paramroot, text = "K_eq", variable = keqparam).grid(row = 2, column = 1, sticky = W) Checkbutton(paramroot, text = u"\u0394Hrxn", variable = delHrxnparam).grid(row = 3, column = 1, sticky = W) Checkbutton(paramroot, text = "K_f", variable = kfparam).grid(row = 4, column = 1, sticky = W) Checkbutton(paramroot, text = "Eact_f", variable = Afparam).grid(row = 5, column = 1, sticky = W) sticklabel = Label(paramroot, text = "2. Simple reaction001") sticklabel.grid(row = 10, column = 0, sticky = W) Label(paramroot, text = u"\t A + C \u2192 E").grid(row = 12, column = 0, sticky = W) Checkbutton(paramroot, text = "Rate of reaction (k)", variable = ksimparam).grid(row = 11, column = 1, sticky = W) Checkbutton(paramroot, text = "Act Energy (A)", variable = Aparam).grid(row = 12, column = 1, sticky = W) Label(paramroot, text = "Order of reaction:").grid(row = 13, column=1, sticky = W) Checkbutton(paramroot, text = "Reactant A", variable = RAparam).grid(row = 13, column = 2, sticky = W) Checkbutton(paramroot, text = "Reactant C", variable = RCparam).grid(row = 14, column = 2, sticky = W) def SubmitParam(): global total_number_parameters total_number_parameters = RCparam.get() + RAparam.get() + Aparam.get() + ksimparam.get() + Afparam.get() + kfparam.get() + delHrxnparam.get() + keqparam.get() print total_number_parameters for i in range(len(checkboxVars)): if checkboxVars[i].get() == 1: print checkboxVars[i] selectedparam.append(checkboxVars[i]) print selectedparam Button(paramroot, text = "Submit", command = SubmitParam).grid(row = 17, column = 3, sticky =W) butt1 = Button(explorer, text = "Parameters to be estimated",width = 15, command = EstimateParameters) butt1.pack(side = TOP) butt1.config(font=("",9)) The highlighted area is where I am checking if the checkbutton is selected and if selected, I am trying to append the variable name in the list checkboxVar to the new list-selectedparam. however, when I try to print selectedparam, I get the following output: [<Tkinter.IntVar instance at 0x104829098>, <Tkinter.IntVar instance at 0x104829128>] And when I try to print out checkboxVar[i] which is just above the previous line, I get PY_VAR2 PY_VAR3 Can someone please let me know where I am going wrong? Thankyou Pooja

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