🌐 Mailman 3 April 2021 - 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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Error using Xgboost regressor
by Anosh Kaniskar April 28, 2021

April 28, 2021

Hi, I'm getting error when trying to fit the data into the xgboost regressor model, I hope the code is correct and didn't understand the reason for getting this error. Also before I used pca to reduce the dimensionality of the data.. and applied Multiple linear regression after this i tried performing xgboost regression model.. please make me understand what is going wrong here.. I've shared the screenshots.. Regards Anosh

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Use case of assignment expression
by Manprit Singh April 28, 2021

April 28, 2021

Dear sir , Consider an example to find the words from a given sentence having given word as prefix, program should return -1 if no such words found in the sentence. The code is written below : def word_found(string, wd): if word := [ele for ele in string.split() if ele.startswith(wd)]: return word else: return -1 st = "Anuj is a good boy" wd = "goo" ans = word_found(st, wd) print(ans) returns ['good'] that is correct st = "Anuj is a bad boy" wd = "goo" ans = word_found(st, wd) print(ans) returns -1 that is also correct. My question is regarding assignment expressions used in function definition. Is this the appropriate use of assignment expression? Need your guidance. Regards Manprit Singh

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Python strings example
by Manprit Singh April 27, 2021

April 27, 2021

Dear sir, consider a problem where I have to write a function that can return True if the string passed to the function contains at least one digit character and one alphabet character, else the function must return False. The way i am solving it is given below : def str_chk(word_tochk): dig = False alpha = False for ele in word_tochk: dig = dig or ele.isdigit() alpha = alpha or ele.isalpha() return dig and alpha st = "Abhay2" ans = str_chk(st) print(ans) returns True, which is correct as the string contains an alphabet as well as a digit character. st = "Abhay" ans = str_chk(st) print(ans) returns False . which is also correct as there is no digit character in the string now Any suggestions, if the solution can be improved . Regards Manprit Singh

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python debug
by Msd De April 26, 2021

April 26, 2021

Dear Sir, How to use nested def for two functions to integrate over a variable. The error displayed is TypeError: can't multiply sequence by non-int of type 'function Regards, M De

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convert Keras to Onnx
by Luigi Bibbò April 26, 2021

April 26, 2021

Good morning, I need to convert pre-trained model Keras to Onnx. When I am going to convert the system replies: module 'keras' has no attribute,'_is_graph_network'. Thank you Best Regards Luigi

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removing consecutive duplicates from list
by Manprit Singh April 21, 2021

April 21, 2021

Dear sir , Consider a list given below: lst = [2, 3, 3, 4, 5, 5, 3, 7, 9, 9, 4] i need to remove consecutive duplicates from list lst: the answer must be : [2, 3, 4, 5, 3, 7, 9, 4] The code that i have written to solve it, is written below: lst = [2, 3, 3, 4, 5, 5, 3, 7, 9, 9, 4] ls = lst[1:]+[object()] [x for x, y in zip(lst, ls) if x != y] The list comprehension gives the desired result. just need to know if this program can be done in a more readable and less complex way.

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Python program to remove a specific digit from every element of list
by Manprit Singh April 21, 2021

April 21, 2021

Dear Sir, Consider a list lst = [333, 435, 479, 293, 536], i have to remove digit 3 from each element from this list, Along with this if a number made by all 3 is present in the list, that number has to be completely removed . the answer for list lst must be : [45, 479, 29, 56] The way i have solved it, is given below : def remove_digit(x, n): """Function that removes digit n from a number x """ ans, i = 0, 0 while x != 0: x, rem = divmod(x, 10) if rem != n: ans = ans + (rem * 10**i) i = i + 1 return ans lst = [333, 435, 479, 293, 536] ans = [remove_digit(ele, 3) for ele in lst if remove_digit(ele, 3)] print(ans) gives the desired answer as given above.Just need to know if Is there any better implementation for this problem ? assignment expression can be used in the list comprehension written above ? Regards Manprit Singh

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Converting bytes to a string
by Phil April 19, 2021

April 19, 2021

I'm reading serial data from a Pi Pico and I notice that there is what looks like a small 'd' on the end of the string after decoding the byte. The data is received as b'26.3\r\n' and to convert it to a string I do the following: s = data.decode() s.strip('\r\n') # at this point there is a mystery character on the end of the string print(s.strip()) # this strips off the small 'd' I'm wondering what the small, unprintable, 'd' is? -- Regards, Phil

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"Learn by reading code: Python standard library design decisions explained (for advanced beginners)"
by boB Stepp April 16, 2021

April 16, 2021

The link: https://death.andgravity.com/stdlib The article gives a curated selection of a few standard library modules that the author believes will be beneficial for the "advanced beginner" to study. In the section "How to read these" the author recommends this order of study: <quote> * Get familiar with them as a user: read the documentation, maybe play with the examples a bit. * Read the corresponding Python Enhancement Proposal (PEP). The interesting sections usually are the Abstract, Rationale, Design Decisions, Discussion, and Rejected Ideas. * Read the code; it's linked at the top of each documentation page. </quote> The libraries he recommends: dataclasses, pathlib (and compare with os.path), statistics, and, as a bonus graphlib as its discussion by the developers is especially educational. Thought I would pass this along as it might encourage fellow learners to delve into some of the Python standard library source code. Now to find some time... -- Wishing you only the best, boB Stepp

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