🌐 Mailman 3 July 2019 - 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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Inserting long URL's into comments & docstrings?
by James Hartley Aug. 5, 2019

Aug. 5, 2019

This should be a slow ball pitch. Unfortunately, I haven't stumbled across a reasonable answer yet. On occasion, I put long URL's into comments/docstrings simply to document where I found specific information. However, to be a good disciple of PEP8, anything which can't fit within 72 characters needs to be split across multiple lines. Since a number of you seem to be prolific Python coders, what opinion do you have about splitting URL's in comments/docstrings? Thanks!

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Difference between decorator and inheritance
by Gursimran Maken Aug. 2, 2019

Aug. 2, 2019

Hi, Anyone could please let me know the difference between decorators and inheritance in python. Both are required to add additional functionality to a method then why are we having 2 separate things in python for doing same kind of work. Thank you, Gursimran

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Which is better in principle: to store (in file) calculated data or to re-calculate it upon restarting program?
by boB Stepp July 31, 2019

July 31, 2019

I have been using various iterations of a solitaire scorekeeper program to explore different programming thoughts. In my latest musings I am wondering about -- in general -- whether it is best to store calculated data values in a file and reload these values, or whether to recalculate such data upon each new run of a program. In terms of my solitaire scorekeeper program is it better to store "Hand Number, Date, Time, Score, Total Score" or instead, "Hand Number, Date, Time, Score"? Of course I don't really need to store hand number since it is easily determined by its row/record number in its csv file. In this trivial example I cannot imagine there is any realistic difference between the two approaches, but I am trying to generalize my thoughts for potentially much more expensive calculations, very large data sets, and what is the likelihood of storage errors occurring in files. Any thoughts on this? TIA! -- boB

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REQUIRED SUPPORT FOR CODE
by NITESH KUMAR July 26, 2019

July 26, 2019

Dear Sir/Madam I want to make Autocomplete searchbox using database .Please suggest me the code for this. Thanks & Regards Nitesh Kumar

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Fw: CSC1010H 4th assignment
by Mahima Daya July 25, 2019

July 25, 2019

hi there, please could you assist. ________________________________ From: York Singer <SNGYOR001(a)myuct.ac.za> Sent: Thursday, 25 July 2019 20:44 To: Mahima Daya <DYXMAH001(a)myuct.ac.za> Subject: CSC1010H 4th assignment Disclaimer - University of Cape Town This email is subject to UCT policies and email disclaimer published on our website at http://www.uct.ac.za/main/email-disclaimer or obtainable from +27 21 650 9111. If this email is not related to the business of UCT, it is sent by the sender in an individual capacity. Please report security incidents or abuse via https://csirt.uct.ac.za/page/report-an-incident.php. Disclaimer The information contained in this communication from the sender is confidential. It is intended solely for use by the recipient and others authorized to receive it. If you are not the recipient, you are hereby notified that any disclosure, copying, distribution or taking action in relation of the contents of this information is strictly prohibited and may be unlawful. This email has been scanned for viruses and malware, and may have been automatically archived by Mimecast Ltd, an innovator in Software as a Service (SaaS) for business. Providing a safer and more useful place for your human generated data. Specializing in; Security, archiving and compliance. To find out more visit the Mimecast website.

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__weakref__ question
by Sarah Hembree July 25, 2019

July 25, 2019

Can anyone provide some simple example/s or two or three of using weakref? I'm baffled and not seeing any documentation that is meaningful. My interest is to minimize memory usage (generally speaking, overall) and am wondering if this might help. --- We not only inherit the Earth from our Ancestors, we borrow it from our Children. Aspire to grace.

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python idle file couldn't start
by siva July 24, 2019

July 24, 2019

I have tried to start python through idle .but the software didn’t start.it displays “subprocess error”.tell me some solution. Thank you. Sent from Mail for Windows 10

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A question about daunting KeyError
by TAISHI KAWAMURA July 24, 2019

July 24, 2019

Hi tutors on Tutor, I'm Taishi from Japan working in a data analytics team. Currently, I'm trying to analyse purchase data of a fashion brand. However, mysterious KeyErrors started occurring continuously when I was coding, and I haven't been able to get that fixed. Although I asked this question on Stack Over Flow and another platform, I haven't got any solution. I'm suspecting that Anaconda might keep raising the error, or simply there are bugs in the codes. However, I can't be sure what the real cause is. Do you think you can help me out? If yes, please give me some assistance. Regards, Taishi Kawamura

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Python Generator expressions
by Animesh Bhadra July 24, 2019

July 24, 2019

Hi All, Need one help in understanding generator expression/comprehensions. This is my sample code. # This code creates a generator and not a tuple comprehensions. my_square =(num *num fornum inrange(11)) print(my_square) # <generator object <genexpr> at 0x7f3c838c0ca8> # We can iterate over the square generator like this. try: whileTrue: print(next(my_square)) # Prints the value 0,1,4.... exceptStopIterationasSI: print("Stop Iteration") # Another iteration forx inmy_square: print(x) # This prints nothing. Does the generator exhausts its values when we run the iterator once? Lastly any specific reason for not having a tuple comprehensions? Have checked this link, but could not understood the reason? * https://stackoverflow.com/questions/16940293/why-is-there-no-tuple-comprehe… Regards, Animesh

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