🌐 Mailman 3 August 2020 - 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

5 8

Webbrowser's capabilities to do more than just open up a webpage
by Stephen M Smith Aug. 31, 2020

Aug. 31, 2020

I am having trouble with various websites detecting the usage of python, selenium and chrome and rejecting my request to make reservations automatically. I am not scraping or in any way violating information that anyone could or would consider private or proprietary. I have read through all of the questions i can find ( <https://stackoverflow.com/questions/58873022/how-to-make-selenium-script-un detectable-using-geckodriver-and-firefox-through-p> How to make Selenium script undetectable using GeckoDriver and Firefox through Python? - to cite one) and have tried most if not all of the recommendations. I continue to experiment with combinations of what is suggested, but have not found the answer yet. However, it occurs to me that using the python webbrowser module directly would allow me to eliminate the middleman (selenium) and keep my usage clean. (Using wireshark i can see that the header sent with webbrowser appears to be exactly the same as the header sent when i invoke chrome manually, with selenium it is different.) However, webbrowser does not seem to have the ability to fill in forms, 'press' buttons and locate and interact with various elements. In other words, I need to be able to manually create the click, switch_to_frame, xpath_search, find_element_by_class_name, etc. functions provided by selenium. I first hoped that these capabilities would be available in webbrowser, but that seems to be wrong. Then i thought that perhaps i could look through the selenium code and learn how those capabilities were provided and borrow/copy, but that has proven to be difficult. Finally i thought perhaps i could use webbrowser to get started, and then introduce selenium to query the site opened natively (with webbrowser), but i can't figure out if that is possible and am not sure that will work. I am hoping someone out there more knowledgeable than me can point me in the right direction. I know i may be biting off a lot, but i am basically a python hobbyist and am enjoying the learning process. Thanks as always for any and all help provided.

3 2

Datetime object as a class property
by John Weller Aug. 31, 2020

Aug. 31, 2020

I have an instance of a class called, say, data. I know I can create a property, name, in the class as a string with self.name = '' which I can then populate in an instance of my class with data.name = 'John'. How do I create datetime object, eg sunrise, so that in the code I can put data.sunrise = datetime.strptime("05:45:00", "%H:%M:%S"). Self.sunrise = ? Thanks John John Weller 01380 723235 07976 393631

3 4

Interesting article: "Never Run 'python' In Your Downloads Folder"
by boB Stepp Aug. 31, 2020

Aug. 31, 2020

This article -- "Never Run 'python' In Your Downloads Folder" -- brought up quite a few things that I had not actively considered that are potential security risks. I thought it might be of interest and perhaps might help someone not make a bad error in judgement. https://glyph.twistedmatrix.com/2020/08/never-run-python-in-your-downloads-… Perhaps it might generate some fruitful discussion! -- Wishing you only the best, boB Stepp

1 0

beginner question
by Dianna Wotherspoon Aug. 30, 2020

Aug. 30, 2020

Is there someone that would help explain an edx tutorial? I am having trouble with the last part of the self guided certificate course. thanks

2 1

problem
by Dianna Wotherspoon Aug. 30, 2020

Aug. 30, 2020

can you help me with this problem please? Write a program that repeatedly prompts a user for integer numbers until the user enters done. Once Donna entered print out the largest and smallest of the numbers. If the user enters anything other than a valid number catch it with a try accept and put out an appropriate message and ignore the number. Enter 7, too, Bob, 10, and 4 and match the output below. Thanks

2 1

Writing a dictionary to txt file
by nzbz xx Aug. 30, 2020

Aug. 30, 2020

I have a txt file of records that I have converted into a dictionary. How can I write this dictionary back to the txt file after appending/replacing the values of the dictionary keys?

5 6

Why does "window = tk.Tk()" open a tkinter window when typed in the Python interpreter?
by boB Stepp Aug. 29, 2020

Aug. 29, 2020

I learned something new today about tkinter from a book [1], but I do not understand why it happens. If I do this in the Python interpreter: Python 3.8.3 (default, Jul 11 2020, 16:27:50) [GCC 9.3.0] on linux Type "help", "copyright", "credits" or "license" for more information. 3.8.3: import tkinter as tk 3.8.3: window = tk.Tk() A tkinter window opens despite there being no explicit call to window.mainloop(). Why is this so? And even more interesting (and useful) I can see the execution of a tkinter window being built widget by widget like so with the Label widget: 3.8.3: label = tk.Label(window, text="First label.") 3.8.3: label.pack() 3.8.3: label.config(text='Second label.') I am greatly looking forward to someone's explanation of why all of this works without an explicit call to window.mainloop(). [1] "Practical Programming -- An Introduction to Computer Science Using Python 3.6, Third Edition" by Paul Gries, et al, c. 2017. Chapter 16. Creating Graphical User Interfaces, p. 324. -- boB

4 10

Converting a txt file to dictionary
by nzbz xx Aug. 29, 2020

Aug. 29, 2020

I have a plantrecords.txt file with the following format: Plantname date & time of record description description description (blank line) Plantname date & time of record description description description (blank line) . . . How do I convert this text file into a dictionary such that it gives me dict = {'plantname': [datetimerecord, description, description, description], 'plantname': [datetime.....]} so on and so forth

4 6

Turtle help
by Carrie Udowychenko Aug. 29, 2020

Aug. 29, 2020

I am new to Python and have tried every command I can find but still do not seem to be able to access a turtle library and do any drawing. I have tried: import turtle and from turtle import * But after both of these any commands like forward or right still show errors and forward is not recognized. Please help Thanks! Carrie

5 4