🌐 Mailman 3 May 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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best Python Web-Development Applications framework.
by Jojo Mwebaze June 6, 2017

June 6, 2017

Dear All, I am trying to figure out the best Python Web-Development Applications framework. I trying to get started with building Web-Based Applications. Kindly give advise which one is the best for a novice user Cheers, Johnson

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threading tutorial
by Michael C June 2, 2017

June 2, 2017

Hi all: I tried to google for tutorials of threading, but they are all equally confusing. Does someone know of a good page or a book that talk about threading? thanks!

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sub-modules and python3
by john June 1, 2017

June 1, 2017

Hi folks, In the past I used a simple "import filename" for sub-modules in python 2. With python 3 I have run into errors reported (file not found) using python 2 import statements. But I'm not asking how to correct the import as I am able to change the way I write the import as a work around - but I'm importing all the files at once. What I want to know is what is the best practice for my situation. Is there a simple way using python 3 to emulate python 2 imports? Is there a standard python 3 import tool for sub-modules (files)? Is it acceptable to add/change the os path to allow my app to find the modules/files? Any help or thoughts on the matter is welcome. Johnf

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Issue with wsgi_ref.simple_server - sometimes very slow!
by Attila Szabó May 31, 2017

May 31, 2017

Hi All, I'm facing a really strange behavior with python's wsgi_ref.simple_server module. I have the following setup: - Raspberry Pi 2 - Ubuntu Mate 16.04 - Python3.5 - I have the following simple source: #!/usr/bin/env python3import wsgiref.simple_server def my_func(env, start_response): start_response('200 OK', []) return [''.encode()] server = wsgiref.simple_server.make_server( '0.0.0.0', 19891, my_func,) server.serve_forever() After several requests (around every ~5 requests) the response time is getting really-really slow (1-60sec) compared to the average 0.1s response, the server serves the request and then quick again for couple of new requests and then again....getting to be slow... I'm trying to reach the node via my router, and also from outside internet and the latency is there. I have tried the same code also on Windows10 with same python version, from behind the same router and the issue was not present. Also I have removed the router and connected internet directly to Raspberry PI and I faced the same issue. So I think I can say that that is not because of the router for sure. Also, always when I interrupt the running server I'm getting the following exception: Exception happened during processing of request from ('192.168.1.100', 3540)Traceback (most recent call last): File "/usr/lib/python3.5/socketserver.py", line 313, in _handle_request_noblock self.process_request(request, client_address) File "/usr/lib/python3.5/socketserver.py", line 341, in process_request self.finish_request(request, client_address) File "/usr/lib/python3.5/socketserver.py", line 354, in finish_request self.RequestHandlerClass(request, client_address, self) File "/usr/lib/python3.5/socketserver.py", line 681, in __init__ self.handle() File "/usr/lib/python3.5/wsgiref/simple_server.py", line 119, in handle self.raw_requestline = self.rfile.readline(65537) File "/usr/lib/python3.5/socket.py", line 575, in readinto return self._sock.recv_into(b)KeyboardInterrupt That's why I think there is some issue with that recv_into function, but I cannot figure it out how to resolve this... :/ Does anybody faced this same issue? Or anybody has an idea what should I try or what should I modify in python source to solve this issue? Thanks, Attila

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Problem with if statements and else statements
by Jalen Barr May 30, 2017

May 30, 2017

In this code it always changes the PlaceHolder to 0 no matter what Month is set to Month ="September" if Month == "January" or "1": PlaceHolder = 0 else: print("Information Error") print(PlaceHolder)

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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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3D plotting
by Jack Lambert May 29, 2017

May 29, 2017

Hello! I am very new to python and am using it for some astronomy data analysis. What I am trying to is plot a 3D scatter plot of three variables that are being read from a file. I've tried using code from other examples of 3d plots but, having little idea how the code functions, I have had very little luck. Here is the relevant code I am hoping to augment. > import numpy as np import scipy as sp import math from astropy.io import fits import matplotlib.pyplot as plot from pylab import * import matplotlib as mpl from mpl_toolkits.mplot3d import Axes3D def sread(infile): hdulist = fits.open(infile) tdata = hdulist[1].data ra = tdata['ra'] # degrees dec = tdata['dec'] # degree p = tdata['parallax'] # mas return ra,dec,p ra,dec,p = sread('TgasSource_000-000-001.fits') for i in range(len(ra)): if ra[i] > 164 and ra[i] < 166 and dec[i] > 49 and dec[i] < 51 : plot(ra[i],dec[i],'bo') show() > so I'm hoping to plot ra and dec on the x and y axes with p on the z axis. Any way you can give me an idea how to implement this? Thanks!

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How to deploy seamless script updates to your "clients"?
by Juan C. May 29, 2017

May 29, 2017

I have some Python 3.6.0 scripts that my co-workers use for some small and medium tasks. Whenever I have time I fix some bugs and add some features to said scripts to make their lives (and mine :D) easier, but there's a problem: I need to send a new script via email/chat/whatever and they have to replace it wherever they use it, such a hassle. How would I go to put a "update module" inside my script? I was thinking about using Git, because those scripts are already in personal repositories so that I can keep track of changes. Will I have to setup any special permissions so that the scripts can pull requests from my private repositories? I was thinking of something like "check for update before start", if an update is found the script would replace itself with the newer version and restart, is that possible? For example, 'cool-tool.py' v0.2 starts and find that version v0.3 is out, so it downloads and replace 'cool-tool.py' code with newer code and restart as v0.3.

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