🌐 Mailman 3 December 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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Updates to web tutor
by Alan Gauld Feb. 2, 2018

Feb. 2, 2018

Only just on topic but i'd like some help please... I've been doing some much needed maintenance to my web tutor. In particular I'm trying to move it from the (web)stone age of HTML3 and Frames to HTML5/CSS and provide a responsive/reactive design. Along the way I've also completely changed the styling to give it a more modern appearance(*). I'm now at the stage where some independent feedback would be useful so if anyone feels like trying out the new design I'd appreciate any feedback - especially on how it works on mobile devices of the Apple variety. The test site is: http://www.alan-g.me.uk/l2p2/ I've done the first 2 sections - up to the Error Handling topic. PS: There is very little changed in the actual content so far - just a few typos fixed and a couple of extra explanatory paragraphs I've been meaning to add for a while. Its really the web design that I'm working on just now. (*)The TOC will eventually be restyled to a block menu look but is just boring hyperlinks for now. Any feedback is appreciated. -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ http://www.amazon.com/author/alan_gauld Follow my photo-blog on Flickr at: http://www.flickr.com/photos/alangauldphotos

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Installing python and numpy on the Mac (OSX)
by Peter Hodges Jan. 13, 2018

Jan. 13, 2018

Hi. I downloaded Python 3.6 from the python site, then followed online directions for pip to install numpy (in users? —user was in the example). When I start IDLE in the Python 3.6 in Applications and then type import numpy as np I get the following: import numpy as np Traceback (most recent call last): File "<pyshell#0>", line 1, in <module> import numpy as np ModuleNotFoundError: No module named ‘numpy' Does this mean I need to set the $PATH with some new pathname? Or move the numpy directory into the python 3.6 directory? Or? Thanks for any help, Peter

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IDLE
by Jay Kelman Jan. 1, 2018

Jan. 1, 2018

I’m a beginner. I downloaded Python and when I look at IDLE it tells me to update TCL. I downloaded updated Active TCL and installed it but can’t figure how to use update to get IDLE corrected. Any help?

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Re: [Tutor] Tutor Digest, Vol 166, Issue 21
by anish singh Dec. 28, 2017

Dec. 28, 2017

>> However, I am stuck. I have below code which is not working. I don't know how to achieve this programmatically: sorted by the number of occurrences in a descending order. If two or more words have the same count, they should be sorted alphabetically (in an ascending order). > > Define "not working" > Do you get an error message? (show us) I am not getting any error message but i don't know how to get the expected result. #getting: [('just', 4), ('practice', 3), ('perfect', 2), ('youll', 1), ('makes', 1), ('get', 1), ('by', 1)] #expected: [["just","4"],["practice","3"],["perfect","2"],["makes","1"],["youll","1"],["get","1"],["by","1"]] > If the output different to what you expect (show us) explained above. > > Have you tried printing the intermediate results? I did but I don't know how to get what i am looking for. > For example the dictionary before you sort it? > Or what about using the default sort, how close is that? > > Don't expect us to run your code and check the output. https://paste.pound-python.org/show/NappXV9daDMFz64yA805/ With the above code, i don't know what we can modify this to get expected result as below: #getting: [('just', 4), ('practice', 3), ('perfect', 2), ('youll', 1), ('makes', 1), ('get', 1), ('by', 1)] #expected: [["just","4"],["practice","3"],["perfect","2"],["makes","1"],["youll","1"],["get","1"],["by","1"]]

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How to create a python extension module from a shared library?
by Etienne Robillard Dec. 27, 2017

Dec. 27, 2017

Hi all, I want to build a CPython extension module for the libuwsgi.so shared library included in uWSGI. My objective is to allow unconditional access to this shared library using the standard Python interpreter, for introspection purpose and extending uWSGI. I have investigated several ways to do this: 1. ctypes Probably the most straightforward to load the shared library >>> from ctypes import CDLL >>> lib = CDLL('./libuwsgi.so') However, this method does not properly reflect C functions and variables to their respective Python attributes... 2. CFFI/pycparser Next I tried to parse the uwsgi.h file with CFFI and pycparser: >>> from cffi import FFI >>> ffi = FFI() >>> lib = ffi.cdef(open('./uwsgi.h').read()) However, since directives are not supported in CFFI, it's not possible to parse the header file. 3. CFFI/clang For this experiment, I wanted to parse the C header file to generate a Abstract Syntax Tree (AST) using clang: >>> from pycparser import parse_file >>> ast = parse_file('./uwsgi.h', use_cpp=True, cpp_path='clang') >>> ast.show() FileAST: (at None) Ideally, it would be really cool if CFFI could parse a C header and generate a AST with libclang. Another possibility I haven't explored yet is to use cppyy. So, could you please advise on the most robust approach to reflect a shared library into a Python extension module? Regards, Etienne -- Etienne Robillard tkadm30(a)yandex.com https://www.isotopesoftware.ca/

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Hi there, have a question for a side project in physics.....
by Siddharth Sehgal Dec. 25, 2017

Dec. 25, 2017

Hi there I am a novice python user and am a physics masters student. I am trying to use the Sellmeier Equation to calculate a refractive index. The coefficients of this equation are decimals to a large number of sig figs ( i.e B1 = 1.03961212, B2 = 0.231792344, C1 = 6.00069867×10−3 ... and so on) in the sellmeier formula there is a lot of fractions, multiplication and squaring of these numbers. I originally state them as floats. However such a process apparently cannot be done with "floats" like these. What do i do? PLEASE NEED HELP! The actual equation is below screen shotted Many thanks, I look forward to your response, THIS IS NOT HOMEWORK BY THE WAY, I just want to use this program as it saves a lot of writing on paper. Siddharth Sehgal MSc Student in Physics SUNY - Stony Brook University

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installation of Python 2.7 an 3.6, feedback
by marcus lütolf Dec. 24, 2017

Dec. 24, 2017

dear experts, while working through Alan C. Goulds excellent update on Learning to Program I copied the file echoinput.py from the Conversing with the user section: import sys inp = sys.stdin.readline() while inp.strip != '': print(inp) inp = sys.stdin.readline() in my IDLE 3.6 location and another copied a second file in one of my personal folders in my PC (W 10). If I open echoinput.py in IDLE 3.6 I get the script as written. If I open and edit it in my personal folder it opens in a Python 2.7 window although, I deleted Python 2.7 previously. Further on, if I add a print statement to echoinput.py it gets printed regardless of parenteses or none in the echoinput.py file in my personal folder. What causes this odd behavior ? Finally a may be too late comment on the update of Learning to Program : Personally I would appreciate a definition of an instance and in referring to Windows XP Home in the Coding Style section (Note for Windows users) I thought W XP has expired. Marcus Luetolf --- Diese E-Mail wurde von Avast Antivirus-Software auf Viren geprüft. https://www.avast.com/antivirus

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sort by value and then by key
by anish singh Dec. 24, 2017

Dec. 24, 2017

document = "Practice makes perfect. you'll only get Perfect by practice. just practice!" output: [ ["practice", "3"], ["perfect", "2"], ["by", "1"], ["get", "1"], ["just", "1"], ["makes", "1"], ["only", "1"], ["youll", "1"] ] I am supposed to return a list of all unique words in it and their number of occurrences, sorted by the number of occurrences in a descending order. If two or more words have the same count, they should be sorted alphabetically (in an ascending order). However, I am stuck. I have below code which is not working. ---------------------------------------------------------------------------------------- import collections x = collections.OrderedDict() import collections import operator def make_comparator(x, y): if x[1] > y[1]: return 1 elif x[1] < y[1]: return -1 elif x[1] == y[1]: if x > y: return 1 elif x < y: return -1 return 0 document = "Practice makes perfect. you'll only get Perfect by practice. just practice!" words = document.split() d = collections.defaultdict(int) for word in words: word = word.lower() word = [c if c >= 'a' and c <= 'z' else "" for c in word] word = "".join(word) d[word] += 1 output = [] for key, value in sorted(d, cmp = make_comparator(x)): output.append([key, value]) print(output) ---------------------------------------------------------------------------------------- Thanks,

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vol 166, issue 20, 1. installing python and numpy on the Mac (OSX) (Peter Hodges)
by Bruce Todd Puls Dec. 24, 2017

Dec. 24, 2017

sudo -H python3.6 -m pip install numpy

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